Aftermarket Power Steering Pump Pulley for MerCruiser Sterndrives – Serpentine Belt, Replaces 861578
Aftermarket Power Steering Pump Pulley for MerCruiser Sterndrives – Serpentine Belt, Replaces 861578 is backordered and will ship as soon as it is back in stock.
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Aftermarket Power Steering Pump Pulley for MerCruiser Sterndrives –...
Aftermarket Power Steering Pump Pulley for MerCruiser Sterndrives – Serpentine Belt, Replaces 861578 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket power steering pump pulley is designed for MerCruiser stern-drive and inboard/outboard applications using a serpentine belt. It is listed for the MerCruiser power steering pump and is intended as a replacement for the original pulley identified by reference number 861578.
The Sierra catalog identifies aftermarket number 18-8297 as a power steering pump pulley for sterndrives with a serpentine belt and lists it as replacing 861578. Company product records also list MerCruiser reference numbers 8M0150723 and 8M0146318.
- Power steering pump pulley for MerCruiser sterndrives.
- For serpentine-belt systems.
- Aftermarket replacement, not an OEM component.
- Verify the pulley style and reference number against the original part before ordering.
Part Number Matrix
Use these references to compare the replacement pulley with the part installed on your engine.
| Brand or Source | Reference | Description |
|---|---|---|
| Sierra | 18-8297 | Power steering pump pulley |
| MerCruiser | 861578 | Replacement reference |
| MerCruiser | 8M0150723 | Company-listed reference |
| MerCruiser | 8M0146318 | Company-listed reference |
Compatibility Information
This pulley is intended for MerCruiser stern-drive and inboard/outboard applications equipped with a serpentine belt and a compatible power steering pump. Engine family, model year, serial number, accessory-drive configuration, and pulley design can affect fitment.
Do not rely on engine displacement alone to confirm compatibility. Compare the existing pulley, belt type, mounting arrangement, and reference number before installation.
| Application | Belt Type | Component | Reference |
|---|---|---|---|
| MerCruiser stern-drive / inboard-outboard | Serpentine belt | Power steering pump pulley | 861578 |
Technical Specs
- Product Type
- Power steering pump pulley
- Application
- MerCruiser stern-drive and inboard/outboard systems
- Belt Configuration
- Serpentine belt
- Product Status
- Aftermarket replacement
- Primary Reference
- 861578
What’s in the Box
- 1 x Aftermarket power steering pump pulley
Installation Notes
- Disconnect the battery and allow the engine to cool completely.
- Release the serpentine-belt tension and remove the belt from the pulley, following the routing information for your engine.
- Remove the original power steering pump pulley using the appropriate service tools. A pulley puller and installer may be required for press-fit designs.
- Inspect the pump shaft, pulley mounting surface, and belt for wear or damage before installation.
- Install the replacement pulley using the correct procedure for the pump and pulley design. Do not hammer the pulley onto the shaft.
- Confirm that the pulley is fully seated and aligned with the other belt-driven components.
- Reinstall the serpentine belt, reconnect the battery, and check belt tracking and pulley operation before returning the boat to service.
Troubleshooting & FAQ
How can I confirm that this pulley fits?
First, confirm that your application uses a serpentine belt and a compatible MerCruiser power steering pump. Then compare the original pulley and its reference number with 861578 and the other references listed above. Engine displacement by itself is not sufficient to confirm fitment.
Is this pulley for a V-belt system?
No. This listing is for the serpentine-belt power steering pump pulley. A V-belt pulley has a different belt profile and should not be substituted without confirming the complete accessory-drive configuration.
What are common signs of a damaged pulley?
Possible signs include pulley wobble, belt misalignment, belt squealing or chirping, unusual belt wear, or visible damage to the pulley. Inspect the pump shaft and belt system as well, since a damaged pulley may be caused by another belt-drive problem.
Do I need special tools for installation?
Many power steering pump pulleys are press-fit and require a dedicated pulley puller and installer. Use the service procedure and torque specifications applicable to your engine and pump. Do not force the pulley into place with a hammer or improvised tools.
Can I reuse my old serpentine belt?
Inspect the belt for cracking, fraying, glazing, contamination, stretching, or other damage. Replace it if its condition is questionable, and confirm that the belt routing and tensioner are correct after installation.
What happens if the pulley is misaligned?
Misalignment can cause belt noise, accelerated belt wear, belt derailment, or loss of operation from belt-driven accessories. Make sure the pulley is fully seated and runs in the same plane as the other pulleys.
Is this an OEM part?
No. This is an aftermarket replacement power steering pump pulley. The listed reference numbers are provided for application and comparison purposes.
Safety & Important Info
- Confirm the serpentine-belt configuration, pulley profile, mounting arrangement, and reference number before ordering.
- Do not install this pulley on a V-belt system unless the complete application has been specifically verified.
- Disconnect the battery and keep hands, clothing, and tools away from moving belt components during testing.
- Professional installation is recommended when pulley removal or installation requires specialized tools.
About Sea Sierra
- Marine replacement parts selected for common stern-drive and inboard/outboard service applications.
- Clear reference information to help compare replacement components with the original part.
- Support for routine marine maintenance and repair needs.
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