STIHL MS391 rebuild package – unlocking the chainsaw’s hidden potential. This complete information delves into the world of restoring your trusty STIHL MS391, offering a step-by-step journey from preliminary evaluation to triumphant operation. We’ll discover the intricate particulars of every element, equipping you with the data to undertake this rewarding mission. Put together to rework your chainsaw into a strong machine, prepared for any reducing problem.
This information will cowl every little thing from the preliminary introduction to the STIHL MS391 chainsaw and the advantages of a rebuild package, to a breakdown of every element, preparation and instruments, detailed rebuild steps, troubleshooting widespread points, upkeep methods, value evaluation, and various sourcing choices. Get able to grasp the artwork of chainsaw restoration!
Introduction to the STIHL MS391 Rebuild Equipment
The STIHL MS391 is a well-liked and highly effective chainsaw, famend for its sturdiness and efficiency. Its sturdy design makes it a favourite amongst professionals and severe DIY lovers. Nevertheless, even the very best instruments want occasional upkeep and repairs. A rebuild package gives a cheap resolution to revitalize a worn-out MS391, extending its lifespan and preserving its effectivity.A rebuild package is an important funding for any proprietor of an MS391, because it permits for the restoration of the chainsaw’s optimum working situation.
By changing worn-out parts, you are making certain the chainsaw performs as supposed, lowering the danger of sudden failures throughout operation. This ends in improved reducing efficiency, enhanced security, and an extended working life in your instrument. It is akin to giving your prized chainsaw a whole makeover, respiratory new life into its mechanical coronary heart.
Typical Elements in an MS391 Rebuild Equipment
A complete rebuild package for the STIHL MS391 sometimes features a collection of important components. This typically includes important parts just like the chain, bar, chain tensioner, sprockets, and bearings. The package often additionally contains varied seals and gaskets, making certain a good and leak-proof seal round important parts. As well as, you would possibly discover alternative components for the carburetor, clutch, and starter, additional restoring the chainsaw to factory-like specs.
These important parts are meticulously crafted to make sure seamless integration and longevity.
Evaluating Rebuild Equipment Choices
Completely different rebuild kits cater to numerous wants and budgets. Understanding the obtainable choices helps you make an knowledgeable resolution.
| Class | Price range | Elements | Suitability |
|---|---|---|---|
| Price range | Decrease | Important components like chain, bar, sprockets, primary seals | Very best for customers in search of a cheap resolution to handle minor put on and tear. |
| Commonplace | Mid-range | All important components, plus some upgraded parts like bearings and gaskets | Affords a balanced method, balancing value and high quality. |
| Premium | Greater | Consists of high-quality parts, presumably together with upgraded sprockets, chain, and bar, together with superior seals and gaskets. | Really useful for customers prioritizing most efficiency, longevity, and reliability. |
A well-chosen rebuild package can considerably influence the general efficiency and longevity of your STIHL MS391, offering years of dependable service. The selection depends upon your funds, the extent of wear and tear and tear in your chainsaw, and your required stage of efficiency.
Element Breakdown of the Rebuild Equipment
This rebuild package is not only a assortment of components; it is an opportunity to breathe new life into your trusty STIHL MS391. Understanding the person parts and their roles unlocks a deeper appreciation for the precision engineering behind this highly effective chainsaw. Each bit performs a significant half within the total efficiency, and realizing their anticipated lifespan helps you propose forward for future upkeep.The STIHL MS391 rebuild package accommodates a fastidiously curated collection of parts designed to revive the chainsaw to its peak working situation.
These components are chosen not just for their compatibility but in addition for his or her sturdiness and efficiency. The rebuild package meticulously addresses important areas vulnerable to put on and tear, making certain that your chainsaw will proceed to chop by way of the hardest duties with ease.
Vital Engine Elements
The center of the MS391 lies inside its engine. The package often features a piston, cylinder, and rings, all of that are topic to important put on over time. A worn piston can result in decreased energy and elevated friction, impacting the engine’s total effectivity. A broken cylinder can lead to poor combustion and uneven energy supply. The cylinder is the important element of the engine that homes the combustion chamber.
Correctly functioning rings guarantee a good seal between the piston and cylinder, stopping gasoline leakage and maximizing combustion effectivity. The rebuild package typically contains all vital components to handle these essential parts, permitting for an entire engine overhaul. Usually, these parts present indicators of wear and tear by way of scoring, grooves, or important discoloration from extreme warmth.
Slicing System Elements, Stihl ms391 rebuild package
The reducing system is one other space that advantages from common upkeep. The chain itself is an important ingredient of the reducing course of, and a boring or broken chain can scale back reducing effectivity and trigger harmful kickback. The rebuild package typically accommodates a brand new chain bar, which is a important element for the reducing course of. A broken bar might have bent tooth, or noticeable harm from repeated use.
The package will even doubtless embody new chain and sprockets, essential for clean, environment friendly reducing motion. The sprockets, which drive the chain, can put on out over time, inflicting the chain to slide or skip, which can result in harmful kickback or decreased reducing effectivity. Indicators of wear and tear on sprockets can embody noticeable scratches or pitting.
Gasoline and Lubrication System Elements
Correct gasoline and lubrication are important for the sleek operation of any engine. The rebuild package sometimes contains important gasoline strains, gasoline filter, and spark plug. A defective gasoline filter can limit gasoline movement, resulting in inconsistent engine efficiency. A worn gasoline line can result in gasoline leaks, inflicting harm to the engine or the encompassing setting.
A worn or broken spark plug can lead to misfires, impacting engine energy and effectivity. Indicators of wear and tear on these parts are sometimes apparent; leaking gasoline strains, clogged filters, or a visibly broken spark plug.
Desk: Anticipated Lifespan of Elements (MS391)
| Element | Anticipated Lifespan (Typical Use) |
|---|---|
| Piston | 300-500 hours |
| Cylinder | 500-1000 hours |
| Rings | 300-500 hours |
| Chain Bar | 500-1000 hours |
| Chain | 100-200 hours (relying on wooden sort) |
| Sprockets | 500-1000 hours |
| Gasoline Filter | 50-100 hours |
| Gasoline Strains | 100-200 hours |
| Spark Plug | 50-100 hours |
Word: These are estimates and precise lifespan can differ based mostly on utilization circumstances, upkeep, and the kind of wooden being reduce.
Preparation and Instruments for the Rebuild Course of
Getting your STIHL MS391 again to peak efficiency includes extra than simply swapping components. A methodical method, the appropriate instruments, and a contact of respect for the machine are essential for a profitable rebuild. This part Artikels the important instruments and a step-by-step dismantling course of, together with important security precautions.This complete information will stroll you thru the important instruments and the meticulous strategy of disassembling your STIHL MS391 for a rebuild.
Following these directions ensures a protected and environment friendly restoration, maximizing the lifespan and efficiency of your chainsaw.
Important Instruments and Gear
A profitable rebuild requires a well-stocked toolkit. Having the appropriate instruments not solely streamlines the method but in addition ensures precision and security. The next record particulars the essential instruments and gear.
- A sturdy work bench or desk, ideally with a lip or edge to stop instruments from slipping.
- A collection of screwdrivers, together with Phillips and flathead sorts, in varied sizes. Precision is essential for delicate parts.
- A set of wrenches and sockets, ranging in dimension to accommodate the totally different fasteners on the chainsaw.
- A pair of needle-nose pliers, for dealing with small, delicate components and securing wire connections.
- A pair of vise grips, for securely holding and manipulating components.
- A set of lengthy nostril pliers for varied gripping duties.
- A torque wrench is extremely advisable for tightening bolts to the proper specs.
- Security glasses, ear safety, and gloves are obligatory for private safety.
- A clear, well-lit workspace is important to make sure visibility and stop accidents.
Disassembling the STIHL MS391
A scientific method to disassembly is important. This detailed process Artikels the steps for taking aside your chainsaw safely and successfully.
- Preliminary Security Measures: Disconnect the spark plug wire, and make sure the gasoline tank is totally drained. Place the chainsaw on a secure floor and put on acceptable security gear.
- Eradicating the Deal with and Outer Elements: Fastidiously take away the handles and any outer covers, noting the place of every half and any retaining mechanisms. Take pictures if wanted.
- Disconnecting and Eradicating Inside Elements: Disconnect all wires, hoses, and linkages. Take away the air filter, gasoline pump, and different simply accessible parts, holding monitor of their placement and any related markings.
- Disassembly of the Engine Block: Fastidiously take away the engine block cowl, being aware of the screws and retaining clips. Doc the placement and place of the cylinder head.
- Detailed Inspection: Examine every half for harm or put on. Doc any issues or uncommon findings. Take pictures or make notes as you proceed.
- Thorough Cleansing: Clear all components completely, eradicating any grime or particles. This step is essential for correct meeting and performance.
Security Precautions
Security is paramount all through the complete rebuild course of. These precautions are important to stop accidents and accidents.
- All the time disconnect the spark plug wire earlier than engaged on the engine.
- Make sure the gasoline tank is totally empty earlier than beginning any work.
- Put on acceptable security gear, together with security glasses, ear safety, and gloves.
- Work in a well-lit, clear space, free from obstructions.
- Use warning when dealing with sharp objects or transferring components.
- By no means pressure any components in the course of the disassembly or meeting course of.
- Observe the producer’s directions for any particular security tips.
Instruments and Their Capabilities
The next desk summarizes the instruments and their particular roles within the rebuild course of.
| Instrument | Perform |
|---|---|
| Screwdrivers | Eradicating and putting in screws, nuts, and bolts |
| Wrenches/Sockets | Tightening and loosening fasteners |
| Pliers | Greedy, manipulating, and holding small components |
| Torque Wrench | Making certain fasteners are tightened to the proper torque specs |
| Security Glasses | Defending eyes from particles and flying particles |
| Gloves | Defending palms from cuts, scrapes, and sharp objects |
Detailed Steps for Rebuild Procedures
Rebuilding your STIHL MS391 chainsaw is a rewarding course of, permitting you to revive its energy and effectivity. This meticulous method ensures the longevity of your instrument and gives a deeper understanding of its interior workings. This part will present a step-by-step information, detailing the method from element removing to last meeting.
Disassembly Process
Thorough disassembly is essential for a profitable rebuild. Improper removing can result in harm to components and compromise the integrity of the rebuild. Observe these steps methodically to make sure all parts are dealt with with care:
- Safe the chainsaw. Use acceptable security gear, together with eye safety and gloves, all through the complete course of.
- Take away the gasoline tank and drain any remaining gasoline. Correctly eliminate the gasoline based on native laws.
- Disconnect the spark plug wire and thoroughly take away the spark plug.
- Take away the air filter meeting and clear it completely or exchange it with a brand new one.
- Fastidiously take away the chain and bar meeting. Word the orientation and any markings to make sure appropriate reassembly.
- Unbolt the assorted parts just like the carburetor, clutch, and gearbox cowl, following the correct sequence. Use a guidelines to keep up the proper order and stop errors.
- Decompose the parts and examine every half for put on or harm. Doc any findings for future reference.
- Completely clear all components with acceptable solvents to take away any particles, grime, or outdated lubricant. This step is important for correct perform.
Element Substitute
Changing worn-out parts is important to revive the chainsaw’s optimum efficiency. This part particulars the method of changing parts whereas sustaining the proper meeting sequence:
- Seek advice from the detailed components record of the rebuild package. Guarantee you may have the proper alternative components and that they match the unique specs. Exact matching is important for optimum efficiency.
- Fastidiously examine the brand new parts for any defects. This ensures that you simply’re putting in components that meet the required requirements. Visible inspection is paramount.
- Make the most of the suitable instruments to take away and exchange parts. Following producer suggestions is essential for correct set up. Exact instrument utilization is essential.
- Guarantee correct lubrication and tightening of fasteners to stop points throughout operation. Correct torque is essential to keep away from untimely failure.
Meeting Process
Sustaining the proper meeting sequence is important for making certain correct perform and stopping harm. The order of meeting is important to keep away from any potential malfunctions.
| Step | Motion | Significance |
|---|---|---|
| 1 | Reassemble the gearbox cowl. | Ensures correct gear engagement and transmission of energy. |
| 2 | Set up the clutch and associated parts. | Vital for clean chain engagement and operation. |
| 3 | Mount the carburetor meeting. | Correct carburetor placement ensures appropriate gasoline combination. |
| 4 | Connect the air filter and spark plug. | Mandatory for correct airflow and ignition. |
| 5 | Set up the chain and bar meeting. | Essential for protected and environment friendly operation. |
| 6 | Reinstall the gasoline tank and join the spark plug wire. | Full the system for correct functioning. |
Troubleshooting and Widespread Points
Bringing your STIHL MS391 again to life after a rebuild is a rewarding expertise. Nevertheless, like every intricate course of, potential snags can come up. This part delves into widespread issues encountered in the course of the rebuild and gives options to get you again on monitor. Realizing these pitfalls and their fixes will prevent time and frustration.
Widespread Issues Throughout the Rebuild Course of
Troubleshooting in the course of the rebuild course of is commonly about meticulous consideration to element. Figuring out issues early can prevent from important complications and wasted time. Incorrect meeting sequences or neglecting essential steps can result in unexpected issues. As an example, improper reassembly of the piston and cylinder can result in leaks or improper sealing.
- Incorrect element alignment can result in untimely put on and tear in important parts, just like the bearings or the crankshaft.
- Inadequate lubrication throughout reassembly can lead to seized components, which require additional disassembly and probably alternative.
- Overtightening of fasteners can harm parts and compromise their structural integrity.
Potential Points from Incorrect Meeting
Thoroughness and precision are paramount in each step of the reassembly. A slight misalignment, a missed step, or a misplaced element can create a domino impact, resulting in quite a few issues down the road. This cautious consideration is essential to making sure the optimum efficiency of your MS391.
- Incorrectly put in gaskets can result in leaks within the gasoline or oil techniques, impacting the engine’s efficiency and probably inflicting harm.
- Improperly aligned gears or sprockets may cause extreme put on and noise, hindering clean operation.
- Mismatched parts may cause incompatibility and create a bunch of unexpected issues, starting from minor changes to finish alternative.
Widespread Causes of Failure in MS391 Elements
Understanding the potential weaknesses of various parts will help you proactively deal with potential points. Figuring out the foundation explanation for an issue typically results in the simplest resolution.
- The carburetor, a significant element in gasoline supply, can malfunction as a consequence of clogged jets or improper changes.
- The spark plug, important for ignition, can fail as a consequence of harm or improper hole settings.
- Extreme use with out correct upkeep can result in important put on and tear on parts, such because the piston and cylinder, in the end leading to a necessity for alternative.
Troubleshooting Information
Addressing points proactively typically avoids important restore work later. A scientific method to troubleshooting can prevent effort and time.
| Downside | Attainable Trigger | Answer |
|---|---|---|
| Engine will not begin | Defective spark plug, clogged carburetor, low gasoline | Verify spark plug situation, clear carburetor, guarantee enough gasoline |
| Engine runs tough | Air leaks, worn parts, improper combination | Verify for air leaks, examine parts for put on, alter gasoline combination |
| Engine overheats | Inadequate coolant, clogged radiator, air leaks | Verify coolant ranges, clear radiator, examine for air leaks |
Upkeep and Lengthy-Time period Care
Bringing your STIHL MS391 again to life with a rebuild package is a implausible achievement. Now, to maintain it buzzing for years to come back, correct upkeep is essential. Consider it as giving your trusty chainsaw a spa day—common maintenance ensures optimum efficiency and prevents expensive repairs down the street.A well-maintained chainsaw is not nearly avoiding issues; it is about maximizing its energy and effectivity.
Common upkeep retains the engine working easily, prolongs the lifetime of essential parts, and reduces the danger of accidents. It is a proactive method to chainsaw possession, guaranteeing years of dependable service.
Finest Practices for Put up-Rebuild Upkeep
Correct upkeep is essential for maximizing the lifetime of your rebuilt chainsaw. A well-maintained chainsaw will carry out higher, last more, and be safer to function. Constant maintenance ensures the engine and parts function effectively, preserving the worth of your funding.
- Thorough Cleansing: After every use, clear the chainsaw completely. Take away any particles, grime, or sawdust from the engine, the reducing bar, and the chain. This prevents clogs and ensures optimum airflow, permitting the engine to run extra effectively.
- Chain Lubrication: Sustaining a correctly lubricated chain is paramount. Use the advisable chain oil for optimum efficiency and to stop put on and tear. Common lubrication reduces friction and retains the chain working easily, minimizing the danger of injury to the chain and bar.
- Bar and Chain Tensioning: Recurrently test and alter the bar and chain rigidity. Correct rigidity prevents the chain from skipping or binding, growing security and efficiency. Constant rigidity is important for a clean and environment friendly reducing expertise.
- Air Filter Inspection: Examine the air filter commonly for grime and particles. A clogged air filter restricts airflow, hindering the engine’s efficiency. Holding the air filter clear ensures the engine receives the correct quantity of air for combustion, maximizing energy and effectivity.
- Gasoline System Upkeep: Preserve the gasoline system clear by draining and changing the gasoline after each few makes use of, particularly throughout extended storage intervals. This helps stop gasoline deterioration and ensures a clean start-up.
Significance of Common Upkeep
Common upkeep considerably impacts the chainsaw’s lifespan. Constant maintenance extends the operational lifespan, stopping sudden breakdowns and expensive repairs. Consider it as investing within the long-term well being of your instrument.
- Prolonging Lifespan: Common upkeep helps prolong the lifetime of the chainsaw, saving you cash on potential repairs or replacements.
- Enhancing Efficiency: A well-maintained chainsaw runs extra effectively, offering extra energy and fewer pressure on the engine.
- Lowering Danger of Accidents: Correctly maintained parts like chains and bars stop sudden malfunctions, minimizing the danger of damage or harm.
- Stopping Surprising Downtime: Proactive upkeep avoids sudden breakdowns, saving you time and frustration throughout your outside initiatives.
Suggestions for Stopping Future Points
Proactive upkeep prevents many widespread issues. Addressing potential points earlier than they escalate saves time, cash, and energy. Predictive upkeep is a proactive method that minimizes potential issues.
- Correct Storage: Retailer your chainsaw in a dry, well-ventilated space to stop rust and moisture harm. Correct storage safeguards the machine from environmental elements, preserving its situation.
- Utilizing Appropriate Equipment: All the time use the advisable reducing chain and bar in your STIHL MS391 to keep away from damaging parts. Utilizing the proper equipment prevents mishaps, maximizing effectivity and security.
- Monitoring Engine Temperature: Take note of the engine temperature throughout operation. Extreme warmth can harm inner parts, so make sure the engine isn’t overheating.
Upkeep Schedule
This desk gives a urged schedule for normal upkeep duties. Adapt this schedule based mostly in your utilization frequency and environmental circumstances.
| Job | Frequency |
|---|---|
| Clear the chainsaw | After every use |
| Lubricate the chain | After every use |
| Verify and alter bar and chain rigidity | Weekly |
| Examine the air filter | Month-to-month |
| Drain and exchange gasoline | Each few makes use of / month-to-month |
| Examine engine parts | Yearly |
Value Evaluation and Worth Proposition
A well-maintained chainsaw is a beneficial asset, and rebuilding an older mannequin can typically be a sensible monetary resolution. This part explores the cost-effectiveness of a rebuild package versus shopping for a brand new chainsaw, offering an in depth comparability of prices and highlighting the long-term worth proposition of revitalizing your current instrument. Rebuilding typically gives a compelling various to alternative, saving each cash and sources.This comparability helps you perceive the monetary implications of every choice, in the end enabling a extra knowledgeable alternative about your chainsaw’s future.
Value Comparability: Rebuild vs. New
Understanding the overall prices concerned in each eventualities is essential for making an knowledgeable resolution. A rebuild package, whereas requiring some labor and time funding, can typically be a less expensive resolution in the long term. The entire value of a rebuild package contains the price of the package itself, plus any vital spare components, lubricants, and instruments.
Detailed Breakdown of Prices
A breakdown of the overall prices is important for evaluating rebuild and alternative choices. The price of a brand new chainsaw varies considerably based mostly on options, energy, and model. Nevertheless, rebuild kits provide a transparent value benefit in lots of conditions.
- Rebuild Equipment Prices: The value of a rebuild package will differ relying on the precise mannequin and the parts included. It is essential to think about potential extra prices like vital spare components and lubricants, in addition to the price of your time spent on the rebuild course of.
- New Chainsaw Prices: New chainsaw costs are decided by varied elements, together with engine dimension, options, and model fame. Think about the added value of equipment like bar and chain units, which frequently come as separate purchases. This preliminary value can rapidly escalate when contemplating extra options.
- Labor Prices (Rebuild): The price of your effort and time must be factored in. This contains the time spent on analysis, procuring components, and the precise rebuild course of. This will differ drastically based mostly in your mechanical abilities and the complexity of the rebuild.
- Potential Spare Components Prices (Rebuild): Whereas a rebuild package sometimes contains many parts, some components may have alternative in the course of the course of. Having an inventory of potential spare components you might want earlier than beginning the rebuild is useful.
Lengthy-Time period Worth Proposition
Past the preliminary value financial savings, a rebuild package gives a compelling long-term worth proposition. By revitalizing your current chainsaw, you are extending its lifespan and making certain continued performance.
- Prolonged Lifespan: Correctly maintained, a rebuilt chainsaw can typically outperform a brand new one, particularly with diligent upkeep. Rebuilding permits the machine to succeed in its full potential, lowering the necessity for frequent replacements.
- Lowered Environmental Impression: Selecting to rebuild your chainsaw reduces the demand for brand spanking new manufacturing and reduces the quantity of digital waste. It is a important side to think about when making your resolution.
- Elevated Reliability: A well-maintained, rebuilt chainsaw is extra prone to function reliably and effectively, offering a constant and reliable instrument for years to come back.
Value Comparability Desk
This desk gives a simplified comparability of the prices related to rebuilding versus buying a brand new chainsaw. Word that particular prices will differ based mostly on particular person circumstances and market fluctuations.
| Value Class | Rebuild | New Chainsaw |
|---|---|---|
| Rebuild Equipment Value | $250 – $500 | $600 – $1200+ |
| Spare Components | $50 – $150 | N/A |
| Labor Prices | $50 – $150 (variable) | N/A |
| Whole Estimated Value | $350 – $850 | $600 – $1200+ |
Various Components and Sourcing Choices
Discovering the appropriate components for a rebuild is essential. Past the package, you would possibly want particular parts or replacements. Exploring various sources is usually a sensible transfer, saving cash and probably discovering hard-to-find objects. Realizing the place to look and what to anticipate from totally different suppliers will provide help to make knowledgeable selections.
Exploring Real and Aftermarket Components
Real STIHL components are identified for his or her high quality and efficiency, typically mirroring the unique design. Nevertheless, their value is usually a important issue. Aftermarket components provide a extra budget-friendly choice, however reliability varies drastically. Thorough analysis and understanding of the provider’s fame are key. A balanced method that considers each real and aftermarket choices can present the very best worth in your wants.
Evaluating Provider High quality and Reliability
When deciding on various components, scrutinize the provider’s fame and monitor file. Search for established corporations with constructive buyer suggestions and a historical past of offering high quality components. On-line evaluations, testimonials, and case research of earlier initiatives can present beneficial insights into the provider’s reliability and the standard of their merchandise. This analysis is essential for making a well-informed resolution.
Potential Provider Comparability
A well-structured desk permits for fast comparisons of various suppliers and their product ranges. This detailed overview gives a handy solution to examine choices and prices.
| Provider | Product Vary (Instance) | Fame/High quality Score (Instance) | Pricing (Instance) |
|---|---|---|---|
| STIHL Real Components | Engine parts, carburetors, chains, sprockets | Wonderful | Excessive |
| [Reliable Aftermarket Brand 1] | Engine parts, filters, housings | Good | Average |
| [Reliable Aftermarket Brand 2] | Chains, sprockets, air filters | Very Good | Low |
| [Online Parts Marketplace] | Big selection, together with used and refurbished components | Variable (depending on vendor) | Variable |
Word: Particular pricing and availability might differ. All the time confirm straight with the provider. The “high quality score” is a subjective evaluation based mostly on normal business fame.
