Stihl MS 251 Parts List PDF: A Comprehensive Guide
Navigating repairs and maintenance for your Stihl MS 251 is simplified with readily available PDF parts lists, detailing components from engine housing to the chain.
The Stihl MS 251 is a widely-used, dependable chainsaw favored by homeowners and professionals alike. Known for its 2.6 HP engine and relatively lightweight design, it excels in various cutting tasks.
However, maintaining peak performance requires access to detailed parts information. This is where a comprehensive parts list PDF becomes invaluable.
Understanding the MS 251’s construction, from the cylinder assembly to the fuel system, is crucial for effective repairs and preventative maintenance.
These lists, often available online, provide exploded diagrams and part numbers, streamlining the process of identifying and ordering necessary replacements.
Understanding the Importance of a Parts List
A Stihl MS 251 parts list is essential for successful chainsaw repair and upkeep. These lists, typically in PDF format, offer detailed exploded views, clearly illustrating how each component fits together. Accurate identification of parts, using precise part numbers, prevents incorrect orders and ensures compatibility.
Beyond repair, a parts list aids in routine maintenance, allowing for proactive replacement of wear items.
Without it, diagnosing issues and sourcing replacements becomes significantly more challenging, potentially leading to costly errors or prolonged downtime.
Locating the Official Stihl MS 251 Parts List PDF
Finding the official Stihl MS 251 parts list PDF typically begins on the Stihl website. Navigate to their support or parts section, and search using the model number “MS 251.” Dealers are also excellent resources, often providing the PDF directly or guiding you to it. Online forums dedicated to chainsaws frequently host links to these documents. Be cautious of unofficial sources; always verify the PDF’s authenticity to ensure accurate part numbers and diagrams, avoiding potential compatibility issues.
Key Components Identified in the Parts List
The Stihl MS 251 parts list meticulously details every component, categorized for easy navigation. Expect comprehensive breakdowns of the engine – cylinder, piston, crankshaft – alongside fuel system specifics like the tank, filter, and oil pump. Ignition parts (spark plug, coil, flywheel) are clearly illustrated. Cutting equipment, including the guide bar, chain, and sprocket, receives dedicated sections. Finally, structural elements like the engine housing, handle, and anti-vibration system are thoroughly documented.
Engine Components
The engine section of the Stihl MS 251 parts list provides granular detail for repair and overhaul. Diagrams showcase the cylinder and piston assembly, crucial for combustion. The crankshaft and connecting rod are illustrated with exploded views, aiding in reassembly. Precise schematics of the carburetor system, including jets and adjustments, are included. This allows for accurate diagnosis and replacement of worn or damaged engine internals, ensuring optimal performance and longevity.
Cylinder and Piston Assembly
The Stihl MS 251 parts list meticulously details the cylinder and piston assembly. It features diagrams illustrating piston rings, piston pins, and connecting rod bearings. Detailed views showcase the cylinder itself, including port configurations. Part numbers identify each component, facilitating accurate ordering of replacements. This section is vital for addressing compression loss or engine damage, enabling precise repairs to restore optimal power and efficiency. Proper assembly, guided by the list, is key to engine longevity.
Crankshaft and Connecting Rod
The Stihl MS 251 parts list provides a comprehensive breakdown of the crankshaft and connecting rod assembly. It illustrates the crankshaft, connecting rod, and associated bearings with clear diagrams. Specific part numbers are assigned to each component, ensuring correct replacement during repairs. This section is crucial for addressing engine knocking or vibration issues. Accurate reassembly, guided by the parts list, is essential for maintaining engine balance and preventing further damage, ensuring reliable operation.
Carburetor System
The Stihl MS 251 parts list meticulously details the carburetor system components. It showcases the carburetor itself, along with jets, gaskets, and fuel intake components, all labeled with precise part numbers. This section is vital for resolving issues like hard starting, poor idling, or reduced power. Diagrams aid in understanding the assembly and proper placement of each part. Correct carburetor maintenance, using the parts list as a guide, ensures optimal fuel-air mixture and efficient engine performance.
Fuel System Components
The Stihl MS 251 parts list comprehensively illustrates all fuel system elements. This includes detailed breakdowns of the fuel tank, cap, fuel filter, and fuel lines, each with corresponding part numbers for easy identification. Crucially, it also covers the oil pump and oil tank assembly. These diagrams are essential for diagnosing fuel delivery problems, leaks, or issues with oil lubrication. Maintaining a properly functioning fuel system, guided by the parts list, is vital for engine longevity and performance.
Fuel Tank and Cap
The Stihl MS 251 parts list provides a detailed schematic of the fuel tank and cap assembly. It showcases individual components like the tank itself, fuel cap, vent, and any associated seals or grommets. Part numbers are clearly labeled, facilitating accurate replacement of damaged or worn parts. Identifying the correct fuel cap is crucial for preventing fuel leaks and maintaining proper fuel pressure. The diagrams aid in understanding the tank’s construction and ensuring a secure, leak-proof fuel storage system.
Fuel Filter and Lines
The Stihl MS 251 parts list meticulously details the fuel filter and lines, essential for maintaining engine performance. Diagrams illustrate the filter’s location within the fuel system and the routing of the fuel lines. Specific part numbers identify the filter itself, fuel line sections, and any connecting clips or fittings. Replacing these components regularly prevents debris from reaching the carburetor, ensuring optimal fuel delivery and preventing potential engine damage. Accurate identification via the parts list is vital for a proper repair.
Oil Pump and Tank
The Stihl MS 251 parts list provides a comprehensive breakdown of the oil pump and tank assembly. Detailed illustrations showcase the tank’s construction, including the cap, strainer, and mounting points. The oil pump is similarly dissected, listing individual parts like the worm gear, drive shaft, and pressure relief valve. Correct part numbers ensure compatibility during replacement, maintaining proper chain lubrication. Identifying these components within the PDF simplifies repairs and guarantees the longevity of your chainsaw’s cutting system.
Ignition System Components
The Stihl MS 251 parts list meticulously details the ignition system. It features exploded views of the spark plug, ignition coil, and flywheel assembly, clearly labeling each component with its corresponding part number. Diagrams illustrate the placement of the ignition coil relative to the flywheel and engine housing. This section is crucial for diagnosing starting issues and ensuring optimal engine performance. Accurate parts identification, facilitated by the PDF, allows for precise replacements and restores reliable ignition.
Spark Plug
The Stihl MS 251 parts list provides specific details regarding the spark plug. It identifies the correct spark plug type, often referencing Bosch or Champion equivalents, and includes its precise part number for easy ordering. Diagrams showcase the spark plug’s location within the cylinder head. The list details associated components like the spark plug boot and resistor. Proper spark plug maintenance, guided by the PDF, is vital for efficient combustion and preventing engine misfires, ensuring optimal chainsaw operation.
Ignition Coil
The Stihl MS 251 parts list meticulously details the ignition coil, a crucial component for initiating combustion. It specifies the coil’s part number, often illustrating its placement relative to the flywheel and engine housing. The PDF clarifies if any associated hardware, like mounting bolts or wiring connectors, are included or sold separately. A functioning ignition coil, identified through the parts list, guarantees a strong spark, essential for reliable starting and consistent engine performance during operation.
Flywheel
The Stihl MS 251 parts list provides a detailed breakdown of the flywheel, a heavy rotating component vital for engine operation. It showcases the flywheel’s part number and often includes diagrams illustrating its position relative to the crankshaft and ignition coil. The PDF clarifies if the flywheel incorporates cooling fins or features a specific ignition timing mark. A correctly functioning flywheel, as detailed in the parts list, ensures consistent engine speed and reliable starting, contributing to overall chainsaw performance.
Cutting Equipment Components
The Stihl MS 251 parts list meticulously catalogs all cutting components, essential for the chainsaw’s functionality. Detailed diagrams showcase the guide bar, chain, and sprocket, with corresponding part numbers for easy identification. The PDF specifies chain pitch, gauge, and drive link count. It also details various guide bar lengths and sprocket tooth configurations. Accurate replacement, guided by the parts list, ensures optimal cutting performance and safety, maintaining the chainsaw’s efficiency and preventing damage.
Guide Bar
The Stihl MS 251 parts list provides comprehensive details regarding the guide bar, a critical cutting component. It lists various bar lengths, typically ranging to accommodate diverse cutting needs. Detailed diagrams illustrate the bar’s construction, including the tip, rail, and groove. Part numbers are clearly indicated for each bar size and specification. The PDF also details compatible sprockets and chain types for each guide bar, ensuring proper fit and optimal performance. Accurate replacement, using the parts list, is vital for safe and efficient operation.
Chain
The Stihl MS 251 parts list meticulously catalogs chain specifications, crucial for maintaining cutting efficiency. It details chain pitch, gauge, and drive link count, ensuring compatibility with the selected guide bar. Part numbers differentiate chain types – standard, rapid, or carving – catering to various applications. Diagrams illustrate chain construction, including cutters, tie straps, and rivets. The PDF clarifies compatible sprocket sizes for each chain, optimizing power transfer. Correct chain selection, guided by the parts list, is paramount for safety and prolonged chainsaw life.
Sprocket
The Stihl MS 251 parts list provides detailed sprocket specifications, essential for optimal chain drive. It lists various sprocket types, differentiated by tooth count and rim thickness, impacting torque and cutting speed. Part numbers clearly identify compatible sprockets for different chain pitches and guide bar combinations. Diagrams illustrate sprocket construction, including the center hole diameter and mounting features. The PDF emphasizes the importance of matching the sprocket to the chain and bar. Regular inspection and replacement, guided by the parts list, prevent chain derailment and ensure efficient operation.
Structural and Housing Components
The Stihl MS 251 parts list meticulously details structural and housing elements, crucial for chainsaw integrity. It showcases the engine housing, identifying components like the cylinder cover and fan housing with precise part numbers. Detailed diagrams illustrate handle assemblies, throttle controls, and anti-vibration systems. The list specifies various screws, bolts, and nuts securing these parts. Replacement parts for the starter housing and recoil assembly are also included. Proper identification, using the PDF, ensures correct fit and maintains the chainsaw’s structural soundness and operator comfort.
Engine Housing
The Stihl MS 251 parts list provides a comprehensive breakdown of the engine housing, a critical structural component. Detailed diagrams showcase the cylinder cover, fan housing, and various mounting plates with specific part numbers. It identifies screws, bolts, and gaskets essential for secure assembly and sealing. The list includes parts for the spark plug boot and access covers. Replacement options for damaged housing sections are clearly illustrated. Accurate identification, via the PDF, ensures proper fit and maintains engine integrity, preventing debris ingress and ensuring optimal performance.
Handle and Controls
The Stihl MS 251 parts list meticulously details the handle and control system components. Diagrams illustrate the throttle trigger, throttle lock button, on/off switch, and complete handle assemblies. Individual parts like control cables, springs, and bushings are clearly identified with corresponding part numbers. The list covers anti-vibration components integrated into the handle. Replacement options for worn or damaged grips are also included. Ensuring correct part selection from the PDF maintains responsive control and operator comfort, vital for safe and efficient chainsaw operation.
Anti-Vibration System
The Stihl MS 251 parts list provides a detailed breakdown of the anti-vibration system. It showcases rubber buffers, steel springs, and mounting plates crucial for reducing fatigue during operation. Exploded views clearly illustrate the placement and interaction of each component. Part numbers are assigned to every element, facilitating accurate replacement. Maintaining a functional anti-vibration system is paramount for operator comfort and long-term health. The PDF ensures easy identification of worn parts, allowing for efficient repairs and sustained chainsaw usability.
Common Stihl MS 251 Problems and Related Parts
The Stihl MS 251 parts list aids in diagnosing frequent issues. Common problems include carburetor malfunctions (requiring replacement of diaphragms or jets), ignition coil failures (necessitating a new coil), and chain/sprocket wear (demanding replacements). The PDF identifies parts related to fuel delivery issues, like filters and lines. It also details components for addressing starting difficulties, such as spark plugs. Accessing the parts list streamlines troubleshooting, ensuring you pinpoint the exact component needing attention for a swift and effective repair.
Where to Purchase Replacement Parts
Utilizing the Stihl MS 251 parts list, sourcing replacements is straightforward. Authorized Stihl dealers offer genuine parts, ensuring quality and compatibility. Numerous online retailers specialize in chainsaw components, providing competitive pricing and convenience. Websites dedicated to Stihl parts often feature exploded diagrams linked to the PDF. Consider local hardware stores that carry Stihl products. Always verify part numbers against the list before purchasing. Comparing prices across vendors is recommended to secure the best deal for your MS 251 repairs.
Using the Parts List for Repair and Maintenance
The Stihl MS 251 parts list PDF is invaluable for both repair and routine maintenance. Identify components needing replacement during troubleshooting. Follow exploded diagrams for correct assembly and disassembly. Use part numbers to order precise replacements, avoiding compatibility issues. Schedule preventative maintenance by referencing the list for wear items. Understand component relationships to diagnose complex problems. Consult the list before undertaking any repair, ensuring you have the necessary parts and knowledge for a successful outcome.
Interpreting Parts Numbers and Diagrams
Stihl MS 251 parts lists utilize specific numbering systems for each component, crucial for accurate ordering. Diagrams are exploded views, illustrating assembly order and component relationships. Part numbers are unique identifiers; verify against your model. Reference the key to understand diagram symbols and abbreviations. Note revision levels, indicating updated parts. Cross-reference numbers may show superseded parts. Pay attention to quantity listed for each part. Understanding these elements ensures correct part identification and successful repairs.
Troubleshooting with the Parts List
The Stihl MS 251 parts list is invaluable for diagnostics. Identify the affected system based on symptoms – engine, fuel, or cutting equipment. Locate the corresponding diagram and examine related components. Check for wear, damage, or misalignment. Parts lists reveal potential failure points. If a component is suspect, verify its part number and condition. Use diagrams to understand assembly and identify missing parts. This systematic approach streamlines troubleshooting and pinpoints necessary repairs.
Safety Precautions When Replacing Parts
Prioritize safety when servicing your Stihl MS 251. Always disconnect the spark plug wire to prevent accidental starting. Wear appropriate safety gear – gloves and eye protection are essential. Ensure the chainsaw is on a stable surface. Properly dispose of old parts and fluids. Consult the parts list for correct torque specifications. Double-check all connections after reassembly. Never modify parts. If unsure, seek professional assistance; improper repairs can be dangerous.
Resources for Additional Information
Beyond the official Stihl MS 251 parts list PDF, numerous online resources offer support. Stihl’s official website provides manuals and FAQs. Dedicated chainsaw forums, like those discussing MS 231/251 issues, offer user experiences and troubleshooting tips. YouTube channels demonstrate repair procedures. Online parts retailers often have exploded diagrams. Local Stihl dealers provide expert advice and genuine parts. Remember to verify information from unofficial sources for accuracy and safety.
Understanding Stihl Part Numbering System
Stihl utilizes a structured part numbering system within the MS 251 parts list PDF. Numbers identify the component, while prefixes and suffixes denote variations or supersessions. Understanding this system streamlines parts ordering and ensures compatibility. For example, a number followed by ‘C’ might indicate a revised version. Consulting the parts list and Stihl’s documentation is crucial for accurate interpretation. Correct part numbers prevent incorrect replacements and maintain optimal performance.
PDF Reader Requirements for the Parts List
Accessing the Stihl MS 251 parts list PDF requires a compatible PDF reader. Adobe Acrobat Reader is a widely recommended, free option, ensuring proper display of diagrams and text. Older PDF versions might cause formatting issues. Ensure your reader is updated for optimal viewing. High-resolution displays benefit from a reader supporting zoom functionality for detailed inspection of parts. A stable internet connection is needed for initial download, but offline viewing is possible afterward.
Alternative Parts List Sources
Beyond the official Stihl website, several sources offer MS 251 parts lists. Third-party retailers specializing in chainsaw parts frequently provide downloadable PDFs or interactive diagrams. Online forums dedicated to Stihl chainsaws often host user-shared parts lists. Parts fiche websites compile exploded views and part numbers. However, verify accuracy against the official Stihl documentation. Beware of outdated or incomplete lists. Cross-referencing multiple sources ensures you have the most reliable information for repairs.
Tips for Efficient Parts Ordering
When ordering Stihl MS 251 parts, utilize the parts list PDF to accurately identify components. Note the exact part number for each item needed, avoiding ambiguity. Batch similar orders to consolidate shipping costs. Compare prices from different authorized dealers. Confirm parts compatibility before finalizing the purchase. Keep a repair log to track replaced parts. Double-check your address for accurate delivery. Consider ordering essential wear items proactively, minimizing downtime.
Warranty Information and Parts Coverage
Stihl’s warranty typically covers defects in materials and workmanship, but doesn’t extend to normal wear and tear. Genuine Stihl parts maintain warranty validity when used for repairs. Always retain proof of purchase and repair records. Non-genuine parts may void the warranty. Specific warranty durations vary by region and product. Review the official Stihl warranty statement for detailed coverage. Authorized Stihl dealers can clarify warranty terms and parts eligibility.
Contacting Stihl Support for Parts Assistance
For direct parts assistance, contact Stihl’s customer support via their official website or phone. Authorized Stihl dealers are also excellent resources for locating parts and providing expert advice. Have your MS 251’s serial number readily available for accurate parts identification. Online parts finders on the Stihl website can streamline the process. Detailed diagrams within the parts list PDF aid in precise part requests. Expect knowledgeable support to guide you through the selection process.
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