Idler Pulley Support Bushing – Fits MerCruiser 5.0L, 5.7L & 6.2L (Replaces 865193)
Idler Pulley Support Bushing – Fits MerCruiser 5.0L, 5.7L & 6.2L (Replaces 865193) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Idler Pulley Support Bushing – Fits MerCruiser 5.0L, 5.7L & 6.2...
Product Details
This engine Idler Pulley Support Bushing is precision-engineered for MerCruiser 5.0L, 5.7L, and 6.2L sterndrive or inboard engines by General Motors that use a serpentine belt system. It serves as a crucial mounting component for idler pulleys, ensuring proper belt alignment and tension. It is specifically designed for use with idler pulleys 807757T, 864625T, and 8M6500024.
This part is a direct replacement for Mercury/Quicksilver part number 865193.
- Installs between the engine bracket and the idler pulley.
- Constructed from durable, corrosion-resistant aluminum.
- Designed specifically for marine serpentine belt systems.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury/Quicksilver | 865193 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For MerCruiser applications, this bushing fits a wide range of sterndrive and inboard models, often with multiple configurations (e.g., ALPHA/BRAVO, HORIZON, MIE). Verify your specific model and serial number range where applicable.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | 350 MAG MPI | Various | 4-Stroke | Up to 2008 | 865193 | Multiple configurations including HORIZON, ALPHA/BRAVO, EC |
| MerCruiser | 350 MAG MPI SKI | Various | 4-Stroke | Various | 865193 | Serial ranges: 0W690000 THRU 1A089999 |
| MerCruiser | 357 MAG | Various | 4-Stroke | 2008 & Up | 865193 | Multiple configurations including Alpha, Bravo, HRZ |
| MerCruiser | 377 MAG MPI | Various | 4-Stroke | Various | 865193 | BRAVO configuration |
| MerCruiser | 383 MAG | Various | 4-Stroke | 2008 & Up | 865193 | Multiple configurations including STROKER, BRAVO |
| MerCruiser | 4.3L CARB/MPI | Various | 4-Stroke | Various | 865193 | ALPHA/BRAVO configurations |
| MerCruiser | 5.0L CARB/MPI | Various | 4-Stroke | Various | 865193 | ALPHA/BRAVO configurations |
| MerCruiser | 5.7L CARB/MPI | Various | 4-Stroke | Various | 865193 | Multiple configurations including SKI, MIE, ALPHA/BRAVO |
| MerCruiser | 6.2L MPI | Various | 4-Stroke | Various | 865193 | Multiple configurations including HORIZON MIE, MIE EC |
| MerCruiser | BLACK SCORPION/SCORPION | 350/377 | 4-Stroke | Various | 865193 | Multiple configurations |
| MerCruiser | MX 6.2L MPI | Various | 4-Stroke | Various | 865193 | Multiple configurations including HORIZON MIE, BRAVO |
Technical Specs
- Product Type
- Idler Pulley Support Bushing
- Installation
- Between bracket and idler pulley
- Housing Material
- Aluminum
- Product Dimensions
- 2.14" H x 11.3" W x 12.0" L
- Weight
- 0.06 lbs (0.027 kg)
- Other Technical Attributes
- Designed for serpentine belt systems
What’s in the Box
- 1 x Idler Pulley Support Bushing (865193)
Installation Notes
- Disconnect the vessel's battery terminals for safety.
- Locate the serpentine belt tensioner and release the tension to remove the belt from the pulleys.
- Unbolt and remove the idler pulley that this bushing supports.
- Remove the old, worn support bushing from its mounting position.
- Clean the mounting bracket surface and install the new support bushing.
- Place the idler pulley over the new bushing and reinstall the retaining bolt.
- Torque the bolt to the engine manufacturer's specified value.
- Reinstall the serpentine belt, ensuring it is correctly routed on all pulleys.
- Reconnect the battery, start the engine, and verify the belt is tracking correctly and quietly.
Troubleshooting & FAQ
How do I know if this bushing is compatible with my specific engine serial number?
The compatibility table provides general model and year ranges. For absolute certainty, it's best to cross-reference the OEM part number (865193) with your engine's specific parts diagram or manual. If your original bushing matches 865193, this part will fit.
What are the signs of a failing idler pulley support bushing?
Common symptoms include a persistent chirping or squealing noise from the engine's belt area, visible wobbling of the idler pulley, or premature belt wear. A worn bushing can cause pulley misalignment, leading to these issues.
Can I replace just the bushing without replacing the whole idler pulley?
Yes, this part is sold separately, allowing you to replace only the worn bushing if the pulley itself is still in good condition. However, it's good practice to inspect the pulley bearing for smoothness and play while it's removed.
What is the recommended replacement interval for this part?
There is no fixed replacement interval. This bushing should be inspected during routine serpentine belt service or whenever you notice signs of wear, such as noise or pulley misalignment. It's a durable component that typically lasts for many years under normal conditions.
What tools are required for this installation?
You will generally need a basic socket/ratchet set to remove the idler pulley bolt and a tool to release tension on the belt tensioner (often a specific size of socket or a tensioner tool). Always consult your engine's service manual for specific tool requirements and torque specs.
Is this part different from the OEM version?
This aftermarket bushing is designed to be a direct functional replacement for the OEM part. It is manufactured to meet or exceed original equipment specifications for material, fit, and performance, offering a reliable alternative at a better value.
What is your shipping speed and cost?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window for items in unused and original condition. See our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement part, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or quality control.
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