Power Steering Pump Pulley – Fits MerCruiser 4.3L-8.2L (Replaces 861578, 8M0150723)
Power Steering Pump Pulley – Fits MerCruiser 4.3L-8.2L (Replaces 861578, 8M0150723) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Free standard shipping on all orders under 1 KG
Power Steering Pump Pulley – Fits MerCruiser 4.3L-8.2L (Replaces 86...
Product Details
This Power Steering Pump Pulley is designed for MerCruiser sterndrive engines from 1996 to 2014 equipped with a serpentine belt system. It fits a wide range of models, including 4.3L, 5.0L, 5.7L, 6.2L, 7.4L, and 8.2L engines, ensuring broad compatibility for many popular boats.
It serves as a direct replacement for MerCruiser part numbers 861578 and 8M0150723, as well as Sierra 18-8297 and aftermarket equivalents 875168 and 807731T.
- Installs on a serpentine belt system.
- Engineered for marine environments.
- Covered by a 1-year warranty against manufacturing defects.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| MerCruiser | 8M0150723 (replaces 861578) |
| Sierra | 18-8297 |
| Aftermarket | 875168 |
| Aftermarket | 807731T |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This pulley is designed for a wide range of MerCruiser sterndrive engines with serpentine belt systems.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | 4.3L | Various | 4-Stroke | 1998 | 861578/8M0150723 | |
| MerCruiser | 4.3LH | Various | 4-Stroke | 1998 | 861578/8M0150723 | |
| MerCruiser | 4.3LX | Various | 4-Stroke | 1996–1997 | 861578/8M0150723 | |
| MerCruiser | 4.3LXH | Various | 4-Stroke | 1996–1997 | 861578/8M0150723 | |
| MerCruiser | 4.5L | Various | 4-Stroke | 2014 | 8M0150723 | |
| MerCruiser | 350 MAG | Various | 4-Stroke | 1998 | 861578/8M0150723 | |
| MerCruiser | 454 MAG | Various | 4-Stroke | 1998–2007 | 861578/8M0150723 | |
| MerCruiser | 5.0L | Various | 4-Stroke | 1996–2007 | 861578/8M0150723 | |
| MerCruiser | 5.7L | Various | 4-Stroke | 1996–2007 | 861578/8M0150723 | |
| MerCruiser | 502 MAG | Various | 4-Stroke | 1998–2007 | 861578/8M0150723 | |
| MerCruiser | 6.2L | Various | 4-Stroke | 1998–2007 | 861578/8M0150723 | |
| MerCruiser | 7.4L | Various | 4-Stroke | 1998–2007 | 861578/8M0150723 | |
| MerCruiser | 8.2L | Various | 4-Stroke | 1998–2014 | 861578/8M0150723 | With Serpentine Belt |
| MerCruiser | 377 | Various | 4-Stroke | 2000–2004 | 861578/8M0150723 | |
| MerCruiser | 377EFI | Various | 4-Stroke | 2000–2002 | 861578/8M0150723 |
Technical Specs
- Product Type
- Power Steering Pump Pulley
- Installation
- Serpentine Belt Compatible
- Dimensions
- Overall Diameter: 5-3/4 inches (146 mm)
- Weight
- 2.00 lbs (0.91 kg)
- Warranty
- 1-year against manufacturing defects
What’s in the Box
- 1 x Power Steering Pump Pulley (Replaces 8M0150723/861578)
Installation Notes
- Disconnect the battery and ensure the engine is cool.
- Release tension on the serpentine belt using a breaker bar or tensioner tool and remove the belt from the pulley.
- Unbolt and remove the old power steering pump pulley. A pulley puller/installer tool may be required if it is press-fit.
- Clean the pump shaft and surrounding area before installing the new pulley.
- Press or bolt the new pulley onto the power steering pump, ensuring it is properly aligned. Refer to your service manual for torque specifications.
- Reinstall the serpentine belt, making sure it is correctly routed on all pulleys.
- Reconnect the battery and start the engine to check for proper operation and belt alignment.
Troubleshooting & FAQ
How can I confirm this pulley fits my engine?
The surest way is to match your existing part number to one of the cross-references listed in our Part Number Matrix. Additionally, review the compatible engine models table. If your engine model and year are listed, and it uses a serpentine belt, this pulley should fit.
What are the signs of a failing power steering pulley?
Common symptoms include a squealing or chirping noise from the engine bay (especially during startups or turns), visible wobbling of the pulley while the engine is running, or cracks and damage on the pulley itself. A worn-out pulley can also cause the serpentine belt to slip or wear out prematurely.
Is this pulley made of the same material as the OEM part?
While the exact composition of OEM parts can vary, this aftermarket pulley is manufactured using high-quality materials designed to meet or exceed original specifications for strength and durability in a marine environment.
Do I need special tools for installation?
You will need standard metric/SAE wrenches and a serpentine belt tensioner tool. Depending on your engine model, you may also need a dedicated power steering pump pulley puller and installer set, as many pulleys are press-fit and cannot be safely removed or installed by other means.
Can I re-use my old serpentine belt with this new pulley?
It is highly recommended to inspect your serpentine belt for signs of wear, such as cracks, fraying, or glazing. If the belt is not in excellent condition, it is best practice to replace it at the same time as the pulley to ensure optimal performance and longevity.
What happens if the pulley is not aligned correctly?
Improper alignment can cause the serpentine belt to jump off the pulleys, shred, or break, leading to a sudden loss of power to all belt-driven accessories (alternator, water pump, power steering). Always ensure the pulley is fully seated and aligned with the other pulleys.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
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 (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, 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 QC.
Payment & Security
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