1. Introduction
This manual provides instructions for the Stens 100-446 Pre-Filter. This pre-filter is designed to protect the main air filter in various lawn and garden equipment engines, extending the life of the primary filter and ensuring optimal engine performance. It is supplied as a 2-pack for convenience.
Image 1: Stens 100-446 Pre-Filter. This image shows the typical appearance of the pre-filter, a foam-like material designed to capture larger debris before it reaches the main air filter.
2. Compatibility
The Stens 100-446 Pre-Filter is a replacement for the following OEM part numbers and fits the specified engine and equipment models:
2.1 Replaces OEM Part Numbers:
- B&S: 271933, 4146, 491435, 491435S
- JD (John Deere): LG491435, LG491435S, PT15849
- Toro: 119-1909
2.2 Fits Models:
- B&S (Briggs & Stratton): 92200, 112200, 12A900-12T899 series, and 128700-129799 series engines.
- JD (John Deere): 14PZ, 14SZ, JS20, JS30 and selected engines on JA60, JA65, JS60, JS61 and JS63 models.
- Toro: 20323, 20835, 20836 and 29639 models.
3. Installation
The pre-filter is typically installed over the main air filter. Always refer to your equipment's specific service manual for detailed instructions on accessing and replacing air filter components.
- Prepare the Engine: Ensure the engine is turned off and cool before beginning any maintenance.
- Locate Air Filter Housing: Identify the air filter housing on your engine. This is usually a plastic or metal cover secured with clips or screws.
- Remove Air Filter Cover: Carefully unfasten the clips or screws and remove the air filter cover.
- Remove Existing Pre-Filter (if applicable): If an old pre-filter is present, gently remove it from the main air filter. Note its orientation.
- Inspect Main Air Filter: While the housing is open, inspect the main air filter for dirt or damage. Replace it if necessary (e.g., with Stens 102-549 or 102-713 air filters, as cross-referenced).
- Install New Pre-Filter: Place the new Stens 100-446 Pre-Filter over the main air filter. Ensure it fits snugly and covers the entire surface of the main filter.
- Reinstall Cover: Replace the air filter cover and secure it with the clips or screws. Ensure a tight seal to prevent unfiltered air from entering the engine.
Image 2: Stens 100-446 Pre-Filter. This image provides a close-up view of the pre-filter, illustrating its texture and form for proper placement over the main air filter.
4. Maintenance
Regular inspection and replacement of the pre-filter are crucial for maintaining engine health and performance. The Stens 100-446 Pre-Filter is designed to be disposable.
- Inspection Frequency: Inspect the pre-filter regularly, especially when operating in dusty or dirty conditions. A good practice is to check it every 25 hours of operation or at least once per season.
- Replacement: Replace the pre-filter when it appears dirty, clogged, or damaged. A dirty pre-filter can restrict airflow, leading to reduced engine power and increased fuel consumption.
- Cleaning (Not Recommended): As this is a disposable pre-filter, cleaning is generally not recommended. Attempting to clean it may compromise its filtration effectiveness. Always replace with a new pre-filter.
5. Troubleshooting
If you experience engine performance issues, a clogged pre-filter could be a contributing factor.
- Reduced Engine Power: If the engine seems to lack power or struggles under load, check the pre-filter. A heavily soiled pre-filter restricts air intake.
- Increased Fuel Consumption: A restricted air filter system can cause the engine to run rich, leading to higher fuel consumption.
- Engine Misfires or Rough Idling: While less common for pre-filters alone, severe air restriction can affect combustion.
Solution: In most cases, replacing a dirty or clogged pre-filter (and main air filter if also dirty) will resolve these issues related to air intake.
6. Specifications
| Feature | Detail |
|---|---|
| Brand | Stens |
| Model Number | 100-446 |
| Compatible Device | Briggs & Stratton 491435S (and others listed in Compatibility section) |
| Item Weight | 0.96 ounces |
| Product Dimensions | 1 x 1 x 1 inches (approximate, for packaging) |
| Reusability | Disposable |
| Number of Pieces | 2 (per pack) |
| UPC | 023899001217 |
7. Warranty and Support
Specific warranty information for the Stens 100-446 Pre-Filter is not provided in this document. For warranty details or technical support, please refer to the official Stens website or contact their customer service directly. Always retain your purchase receipt for any warranty claims.
You can visit the Stens Store on Amazon for more product information.