Simpson Pressure Washer Engine Manual: A Comprehensive Guide
This comprehensive manual details Simpson pressure washer engines, offering guidance on assembly, operation, maintenance, and troubleshooting for optimal performance and longevity.
Understanding Your Simpson Pressure Washer
Your Simpson pressure washer is a powerful cleaning tool, designed for a variety of tasks around your home and property. This section introduces the core components and functionality of your machine. Familiarizing yourself with these aspects will ensure safe and effective operation.
Simpson Cleaning Systems has over 40 years of experience, delivering reliable performance. Before first use, carefully review this manual, paying close attention to safety precautions. Understanding the engine’s role in powering the pump is crucial. The pump generates high-pressure water, while the engine provides the necessary power. Proper maintenance, as outlined later, will extend the life of both components.
Safety Precautions
Prioritize safety when operating your Simpson pressure washer. Always read and understand the entire manual before use. Never point the wand at yourself or others. Wear safety glasses to protect your eyes from debris. Avoid operating the machine on slippery surfaces or in inclement weather.
Ensure proper ventilation when using a gasoline-powered engine, as exhaust fumes contain carbon monoxide. Keep children and pets away from the operating area. Disconnect the power source before performing any maintenance. Always follow all instructions in this and other manuals. Failure to adhere to these precautions could result in serious injury.
Component Identification
Familiarize yourself with your Simpson pressure washer’s key components. These include the engine, pump, high-pressure hose, spray gun, nozzles, and detergent tank. The engine provides the power, while the pump generates the high-pressure water stream.
The hose and spray gun deliver water to the cleaning surface. Nozzles control the spray pattern, and the detergent tank allows for applying cleaning solutions. Refer to the parts diagram for a visual guide. Understanding each component’s function is crucial for proper operation and maintenance, ensuring efficient cleaning performance.
Pressure Washer Parts Diagram
The pressure washer parts diagram is a vital resource for identifying components during assembly, maintenance, or repair. It visually illustrates each part’s location and relationship to others. Key elements include the engine, pump assembly, high-pressure hose connections, spray gun, various nozzles, and the detergent injection system.
Carefully study the diagram to understand how these parts interact. This will aid in troubleshooting and ordering replacement parts. Refer to the manual’s parts list alongside the diagram for specific part numbers. Accurate identification is essential for ensuring compatibility and proper functionality.
Engine Components Overview
The Simpson pressure washer engine comprises several key components working in unison to generate power. These include the engine block, housing the piston and cylinder, the carburetor which mixes air and fuel, and the muffler reducing exhaust noise. The crankshaft converts piston motion into rotational energy, driving the pump.
Essential systems include the fuel tank and lines delivering fuel, the cooling fins preventing overheating, and the spark plug initiating combustion. Understanding each component’s function is crucial for maintenance and troubleshooting. Regular inspection and upkeep of these parts ensure reliable engine performance.
Engine Specifications

Simpson pressure washer engines vary in specifications depending on the model. Generally, these engines are single-cylinder, four-stroke, air-cooled units; Displacement typically ranges from 196cc to 301cc, influencing power output. Horsepower (HP) commonly falls between 6.5 HP and 9 HP, dictating cleaning capability.
Fuel consumption is a key specification, impacting runtime and cost. Oil capacity is crucial for lubrication and engine life. These engines operate on unleaded gasoline with a minimum octane rating of 87. Refer to your specific model’s documentation for precise specifications.
Engine Model Numbers
Identifying your Simpson pressure washer’s engine model number is vital for obtaining the correct parts and service information. Common engine manufacturers include Briggs & Stratton, Honda, and Simpson’s own branded engines. Typical model numbers follow a specific format, often starting with a letter indicating the manufacturer (e.g., BS for Briggs & Stratton).
Numbers then denote the specific engine series and configuration. Locate the model number on the engine’s label, usually affixed to the valve cover or engine block. Record this number before contacting customer support or ordering replacement parts. Accurate identification ensures compatibility and proper repairs.
Power and Performance Metrics
Simpson pressure washer engine performance is measured in several key metrics. Horsepower (HP) indicates the engine’s power output, directly impacting cleaning ability. Pounds per square inch (PSI) represents the water pressure delivered, determining the force of the spray. Gallons per minute (GPM) signifies the water flow rate, influencing cleaning speed and efficiency.
Higher HP, PSI, and GPM generally equate to more powerful cleaning. Engine displacement (cc) also plays a role, indicating the engine’s size and potential power. Understanding these metrics helps you select a pressure washer suited to your specific cleaning needs and tasks.
Assembly Instructions
Before operating your Simpson pressure washer, careful assembly is crucial. Begin by attaching the handle to the main unit using the provided bolts, ensuring a secure fit. Next, connect the high-pressure hose to both the pump and the spray gun, verifying tight connections to prevent leaks.
Attach the desired nozzle to the spray gun, selecting the appropriate spray pattern for your cleaning task. Always refer to the included diagrams for correct component placement. Double-check all connections before adding oil and fuel, following the instructions in the manual.
Starting the Engine
Proper engine starting is vital for reliable operation. Before each start, check the oil level and fuel supply. For a cold start, turn the fuel valve to the ‘ON’ position, set the choke to ‘START’, and pull the starter cord firmly until the engine ignites. Gradually return the choke to the ‘RUN’ position.
For a warm start, the choke may not be necessary; simply turn the fuel valve to ‘ON’ and pull the starter cord. Always ensure a clear area around the pressure washer during startup. Refer to the operator’s manual for specific engine model instructions.
Cold Start Procedure
Initiating a cold start requires specific steps for successful ignition. First, verify the fuel valve is in the ‘ON’ position and the engine switch is set to ‘RUN’. Next, engage the choke by moving the control to ‘START’ – this enriches the fuel mixture for cold conditions.
Firmly grasp the starter cord handle and pull with a smooth, controlled motion. Repeat several times until the engine attempts to start. Once it sputters, gradually disengage the choke, returning it to the ‘RUN’ position. Consult your operator’s manual for model-specific choke adjustments.
Warm Start Procedure
Starting a warm engine differs from a cold start, requiring less fuel enrichment. Ensure the engine switch is set to ‘RUN’ and the fuel valve is open. Typically, no choke is needed for a warm start; however, if the engine doesn’t immediately ignite, briefly engage the choke.
Pull the starter cord firmly, using smooth, controlled motions. Avoid excessive pulling, as this can flood the engine. If it fails to start after a few attempts, disengage the choke completely and try again. Refer to your specific model’s manual for detailed warm start instructions.
Operating Instructions
Before operation, ensure all connections are secure and the unit is on a level surface. Connect the high-pressure hose and nozzle, verifying proper engagement. Start the engine following the outlined procedure. Gradually increase the throttle to achieve the desired pressure, monitoring the gauge.
Always begin with a low-pressure setting and increase as needed for the cleaning task. Maintain a safe distance from the surface being cleaned. Regularly inspect the nozzle for clogs and adjust spray patterns accordingly. Refer to the manual for specific nozzle applications and safety guidelines.
Pressure Adjustment
Adjusting pressure is crucial for effective cleaning and preventing damage. Most Simpson pressure washers feature an unloader valve controlling output. Turning the valve clockwise increases pressure, while counterclockwise decreases it. Begin with the lowest setting and gradually increase until the desired cleaning power is achieved.
Always test the pressure on an inconspicuous area first. Be mindful of the surface material; delicate surfaces require lower pressure. Avoid exceeding the maximum PSI rating of your machine or the surface being cleaned. Regularly check the pressure gauge to maintain consistent output during operation.
Nozzle Selection
Choosing the correct nozzle is vital for optimal cleaning results. Simpson pressure washers typically include a variety of nozzles, each with a different spray angle. A 0-degree nozzle delivers a concentrated stream for stubborn stains, while a 40-degree nozzle provides a wider, gentler spray for larger areas.
Color-coding helps identify nozzles easily. Always refer to the nozzle chart in your manual. Use wider angles for delicate surfaces like painted wood or vehicles. Avoid using a 0-degree nozzle on these materials to prevent damage. Regularly inspect nozzles for clogs and replace them as needed.
Maintenance Schedule
Regular maintenance ensures your Simpson pressure washer’s longevity and peak performance. After each use, inspect hoses and connections for damage. Every 25 hours of operation, check the oil level and add if necessary. After 50 hours, clean or replace the air filter to maintain proper engine airflow.
Annually, change the engine oil and fuel filter. Inspect the pump for wear and lubricate as recommended. Winterizing is crucial in cold climates; drain all water to prevent freezing damage. Refer to the detailed procedures within this manual for each maintenance task.
Oil Change Procedure
To change the oil, ensure the engine is warm but not hot. Locate the oil drain plug beneath the engine and position a suitable oil pan. Remove the plug and allow the oil to drain completely. Replace the plug securely. Next, remove the oil fill cap and add the recommended oil type and quantity – typically a small engine oil, check your manual.
Check the oil level with the dipstick, avoiding overfilling. Dispose of used oil responsibly at a recycling center. Regular oil changes are vital for engine health and performance, extending the life of your Simpson pressure washer.

Air Filter Cleaning/Replacement
Maintaining a clean air filter is crucial for optimal engine performance. Locate the air filter housing, usually on the side of the engine. Remove the cover and inspect the filter. If the filter is dirty, gently tap it to remove loose debris. For heavily soiled filters, wash with mild soap and water, ensuring it’s completely dry before reinstalling.
If the filter is damaged or excessively worn, replace it with a new one. A clogged air filter restricts airflow, reducing power and potentially damaging the engine. Regular inspection and cleaning/replacement will ensure efficient operation.
Fuel Filter Maintenance
Regular fuel filter maintenance prevents debris from reaching the engine, ensuring smooth operation. Locate the fuel filter, typically in the fuel line between the tank and carburetor. Periodically inspect the filter for discoloration or blockage. To replace the filter, shut off the fuel supply and disconnect the fuel line;
Install a new fuel filter ensuring correct flow direction (indicated by an arrow on the filter). Reconnect the fuel line securely. A clean fuel filter maintains optimal fuel delivery, preventing engine issues. Ignoring this maintenance can lead to performance loss and potential damage.
Troubleshooting Common Issues
Encountering problems? This section addresses frequent issues. If the engine won’t start, check fuel levels, spark plug connection, and ensure the choke is properly engaged. Low pressure output often indicates a clogged nozzle, kinked hose, or failing pump – inspect these components. Engine overheating can stem from insufficient oil, a blocked air filter, or excessive load.
Always consult the full manual for detailed diagnostics. Before attempting repairs, disconnect the spark plug wire. If issues persist, contact Simpson customer support for professional assistance. Ignoring problems can lead to further damage and costly repairs.
Engine Won’t Start
A non-starting engine requires systematic checks. First, verify fuel supply – ensure the tank isn’t empty and the fuel valve is open. Inspect the spark plug for fouling or damage; clean or replace as needed; Confirm the spark plug wire is securely connected. Check the choke; it should be engaged for cold starts. Ensure the engine’s kill switch is in the ‘run’ position.
If still failing, examine the air filter for obstructions. Low oil levels can also prevent starting – top up if necessary. Consult the manual’s diagrams for component locations. Always disconnect the spark plug before any inspection.
Low Pressure Output
Reduced pressure often indicates issues with the water supply or pump. Verify the water inlet isn’t clogged with debris. Check the garden hose for kinks or obstructions, ensuring adequate water flow to the unit. Inspect the nozzle for blockage; clean or replace it; Examine the high-pressure hose for damage or leaks.
A worn pump can also cause low pressure; this may require professional repair. Ensure the pressure regulator is set correctly. Refer to the parts diagram in the manual to locate these components. Use SIMPSON Pump Guard to prolong pump life.
Engine Overheating

Engine overheating is a serious concern requiring immediate attention. Check the oil level – low oil is a primary cause. Ensure adequate ventilation around the engine; avoid operating in enclosed spaces. Inspect the cooling fins for debris blockage, cleaning them thoroughly. Verify the air filter isn’t excessively dirty, restricting airflow.
Prolonged operation under heavy load can also contribute to overheating. Allow the engine to cool before attempting to restart. Consult a qualified technician if overheating persists, as internal damage may have occurred. Refer to the maintenance schedule for proper cooling system upkeep.
Winterizing Your Pressure Washer
Proper winterization prevents freeze damage and ensures spring readiness. Drain all water from the pump, hoses, and wand – crucial to avoid cracking. Add pump protector (follow product instructions) to lubricate internal components. Empty and clean the detergent tank thoroughly, preventing residue buildup.
Stabilize the fuel with a fuel stabilizer to prevent degradation during storage. Change the engine oil before storing, removing contaminants. Disconnect the battery and store it in a cool, dry place. Cover the pressure washer to protect it from the elements. Store indoors if possible.
Using Pump Guard
Simpson Pump Guard is vital for protecting your pressure washer’s pump during storage, especially in freezing conditions. It prevents corrosion and lubricates internal parts, extending pump life. Always follow the “USING PUMP GUARD” section within your pressure washer’s manual for precise instructions.
Typically, you’ll disconnect the water supply and run the pressure washer with Pump Guard until it’s fully circulated through the system. Ensure complete coverage by running the unit for a specified duration. Do not use other additives as they may cause damage. Regular use is recommended even for short storage periods.

Understanding Wood Construction Connectors
Simpson Strong-Tie leads in structural solutions, offering a vast range of wood construction connectors. These connectors enhance the strength and safety of wood structures, including decks, fences, and buildings. Quality and reliability are paramount, achieved through rigorous testing and engineering by PhDs and specialized engineers.
Connectors address common wood construction challenges, like load transfer and resistance to seismic forces. The Deck Center provides resources for safe deck building and code compliance. Explore the Wood Construction Connectors catalog for detailed product information and installation guides – over 3,000 connectors are available!
Simpson Strong-Tie Deck Center Resources
The Simpson Strong-Tie Deck Center is a valuable resource for anyone planning to build or assess a deck. It offers guidance on ensuring deck safety and code compliance, crucial for a secure outdoor space. Resources include planning tools, connector selection guides, and installation instructions. Whether you’re a DIY enthusiast or a professional contractor, the Deck Center simplifies the decking process.

Access detailed information on proper fastening techniques and load calculations. Explore resources to address common deck issues and ensure long-term durability. Simpson Strong-Tie’s commitment to innovation is reflected in these readily available tools and support materials.
HDUE Holdown Information
Simpson Strong-Tie’s HDUE holdowns represent a significant advancement in wood construction connector technology. Engineered for increased load capacity, these patent-pending holdowns are ideal for modern residential structures, including taller homes. They meet the demands of today’s building codes and design requirements, offering superior strength and reliability.
HDUE holdowns are particularly suited for three-story homes and projects requiring robust connections. Detailed specifications and installation instructions are readily available to ensure proper application. This innovative design enhances structural integrity and provides peace of mind for builders and homeowners alike.
Wood Construction Connectors Catalog

Simpson Strong-Tie’s comprehensive Wood Construction Connectors catalog is an invaluable resource for builders, engineers, and DIY enthusiasts. Containing detailed product information for over 3,000 connectors, it provides essential specifications and installation instructions. This catalog covers a wide range of applications, from decks and fences to complex timber framing projects.
Download the latest version to access up-to-date information on connector types, load capacities, and code compliance. The catalog emphasizes the importance of following all instructions in accompanying manuals, including those for pressure washers, to ensure safe and effective use of Simpson Strong-Tie products.

Warranty Information

Simpson Cleaning Systems offers a warranty on its pressure washers and engines, protecting against manufacturing defects in materials and workmanship. The warranty period varies depending on the specific model and component, typically covering the engine for a limited time and the pump for a longer duration.
To validate your warranty, retain your purchase receipt and register your product online. The warranty does not cover damage resulting from misuse, improper maintenance, or failure to follow the instructions outlined in this manual. Refer to the full warranty statement included with your pressure washer for complete details and limitations.
Contacting Simpson Customer Support
For assistance with your Simpson pressure washer, our dedicated customer support team is readily available. You can reach us through several convenient channels, including a toll-free phone number and a comprehensive online support portal. Our knowledgeable representatives can assist with troubleshooting, warranty claims, and locating replacement parts.
Visit the Simpson Cleaning Systems website for access to frequently asked questions, downloadable manuals, and a live chat feature. We are committed to providing prompt and helpful support to ensure your satisfaction. Please have your model number and purchase date available when contacting us for efficient service.
Finding Additional Manuals and Resources
Simpson Cleaning Systems offers a wealth of online resources to enhance your pressure washer experience. Explore our extensive online manual database for downloadable versions of owner’s manuals, parts lists, and safety guidelines for various models. Access a comprehensive Frequently Asked Questions (FAQ) section addressing common issues and providing helpful tips.
The Simpson website also features instructional videos demonstrating proper operation, maintenance procedures, and troubleshooting techniques. Furthermore, you can find detailed product specifications and compatibility information. These resources are designed to empower you with the knowledge to maximize the performance and lifespan of your Simpson pressure washer.

Online Manual Database
Simpson’s online manual database is a centralized repository for all your documentation needs. Easily locate and download owner’s manuals, parts diagrams, and safety instructions for current and legacy Simpson pressure washer models. The database is searchable by model number, ensuring quick and accurate access to the information you require.
These digital manuals provide detailed guidance on assembly, operation, maintenance, and troubleshooting. Accessing the database eliminates the need to physically store paper manuals, offering convenience and environmental benefits. Regularly check for updated manuals to ensure you have the latest information available for your Simpson product.
Frequently Asked Questions (FAQ)
Here are answers to common questions regarding your Simpson pressure washer engine. “Why won’t my engine start?” – Check fuel levels, spark plug, and air filter. “How often should I change the oil?” – Refer to the maintenance schedule in your manual, typically after every 50 hours of use. “What type of oil is recommended?” – Use SAE 30 or 10W-30 oil.
“How do I adjust the pressure?” – Utilize the pressure adjustment knob on the pump. “Where can I find parts diagrams?” – Access the online manual database for detailed illustrations. Always consult the full manual for comprehensive instructions and safety precautions.
This guide provides essential information for Simpson pressure washer engine owners. It covers everything from initial setup and safe operation to detailed maintenance procedures and troubleshooting common issues. Understanding your engine’s specifications, including model numbers and performance metrics, is crucial for optimal use.
Follow assembly instructions carefully before the first start. Regular maintenance, such as oil changes and air filter cleaning, will extend the engine’s lifespan. Always prioritize safety by adhering to the outlined precautions. This manual ensures efficient and reliable performance.