Marine Engine V-Belt – Fits MerCruiser 3.7L-7.4L & OMC 7.5L V8 (Replaces 57-33170Q)

Marine Engine V-Belt – Fits MerCruiser 3.7L-7.4L & OMC 7.5L V8 (Replaces 57-33170Q)

This V-belt is engineered for the accessory drive system on a range of MerCruiser and OMC marine engines. It is designed to meet or exceed OEM specifications for reliable power transmission for components like the power steering pump. This belt fits various MerCruiser 3.7L to 7.4L four-stroke models from 1973–1995 and OMC 7.5L V8 460 engines from 1987–1988.

This part is a direct replacement for Mercury part numbers 33170, 34359, 37619, 37619Q, 57-33170Q, 57-34359, 57-37619Q, and 57-37619T. It also replaces OMC part numbers 0509287, 0509288, 0909818, and 0912714, as well as aftermarket equivalents Sierra 18-15520 and Mallory 9-55001.

• Specifically designed as a power steering belt for compatible models.
• Constructed with a synthetic rubber compound and high-strength cords that resist stretching and shock load failure.
• Package includes one (1) engine V-belt.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below.

Technical Specifications

Package Contents

• 1 x V-Belt (Replaces 57-33170Q)

Installation Guide

Always consult your engine’s service manual for detailed instructions. The general steps for replacing a V-belt are:

1. Safety First: Disconnect the battery cables to prevent accidental engine start.
2. Locate the Belt: Identify the V-belt routing and the location of the tensioner pulley. Taking a photo can be a helpful reference.
3. Release Tension: Use the appropriate tool to loosen the tensioner pulley, which will release tension on the belt.
4. Remove Old Belt: Carefully slip the old belt off all the pulleys.
5. Inspect Pulleys: Before installing the new belt, check all pulleys for damage, wobble, or dirt. Clean them if necessary.
6. Install New Belt: Route the new belt according to the engine diagram or the photo you took earlier, ensuring it sits correctly in all pulley grooves.
7. Apply Tension: Re-engage the tensioner to apply the correct tension to the new belt. Tighten any bolts to the manufacturer’s torque specifications.
8. Final Check: Verify the belt is properly aligned and seated on all pulleys. Reconnect the battery and briefly run the engine to check for proper operation.

Troubleshooting & FAQ

How do I confirm this V-belt is the correct one for my engine?
The best way to confirm fitment is to match your original part number to one of the numbers listed in our Part Number Cross-Reference table. You should also verify your engine model and year are included in the Compatible Engine Models list. Pay close attention to any serial number ranges provided.

What are the signs that my V-belt is failing and needs to be replaced?
Common symptoms include a persistent high-pitched squealing or chirping sound from the engine, visible cracks or fraying on the belt's surface, glazing (a shiny, smooth appearance), or pieces of the belt missing. Reduced performance of accessories like the power steering pump is also a key indicator.

Is this belt used for the alternator or power steering?
This specific V-belt is designed for the power steering pump on the listed engine models. Always verify the belt routing diagram for your engine to ensure you are replacing the correct belt.

How often should a marine engine V-belt be inspected?
It is good practice to inspect your engine belts at the beginning of each boating season and after every 100 hours of use. We recommend replacement every 3-5 years or immediately if signs of wear are visible, whichever comes first.

OEM vs. Aftermarket?
This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

How fast do you ship and how much does it cost?
We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

What is your warranty and return policy?
This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.