Raw Water Pump Rebuild Kit – Fits Volvo Penta 3.0-7.4L Engines (Replaces 3857794, 3858847)

Raw Water Pump Rebuild Kit – Fits Volvo Penta 3.0-7.4L Engines

This comprehensive rebuild kit is designed for Volvo Penta and OMC side-mounted raw water pumps used on various marine engines from 3.0L to 7.4L. It contains the necessary components to restore your pump to optimal condition, addressing common wear-and-tear issues like leaks and poor performance.

This kit is a direct replacement for Volvo Penta part numbers: 3857794, 3858847, 3855778, 3862281, 3851623, 3851982, and 3851995.

• Installation Type: Fits side-mounted raw water pumps.
• Engine Compatibility: Designed for gas engines.
• Premium Components: Kit includes premium SKF/KBC bearings with contact seals on both sides for enhanced durability.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers.

Compatible Engine Models

Confirm your engine model/year in the table below.

Technical Specifications

Package Contents

• 2 x Premium SKF or KBC Bearings with contact seals on both sides
• 4 x Stainless Steel Hex Bolts
• 1 x Shaft Seal with 316 Stainless Steel Spring
• 1 x Retaining Ring
• 1 x Johnson Impeller
• 1 x Shaft O-ring
• 2 x End Cover Gaskets
• 1 x Camshaft (Note: Camshaft is not included in all kit variations; please verify contents from product images before purchase.)
• 1 x Impeller Lube

Installation Guide

1. Close the engine's seacock and drain any remaining water from the cooling system.
2. Loosen and remove the serpentine belt from the raw water pump pulley.
3. Carefully disconnect the intake and output water hoses from the pump.
4. Unbolt the pump assembly from its mounting bracket on the engine.
5. Remove the end cover screws and plate, taking care to note the orientation of internal parts.
6. Extract the old impeller, shaft seal, O-rings, and bearings from the pump housing.
7. Thoroughly clean all housing surfaces, removing any old gasket material or debris.
8. Install the new bearings, seals, and retaining ring from the kit, ensuring proper seating.
9. Lightly lubricate the new impeller and the inside of the pump housing with the provided lubricant.
10. Insert the new impeller (twisting in the direction of engine rotation), then install the new gasket and end cover.
11. Re-install the pump onto its bracket, reconnect the hoses securely, and re-tension the belt.
12. Open the seacock, start the engine, and immediately check for any leaks and confirm steady water flow from the exhaust.

Troubleshooting & FAQ

How do I confirm this kit fits my engine?

This kit is designed for side-mounted raw water pumps on a wide range of Volvo Penta and OMC gas engines (3.0L to 7.4L). The best way to confirm fitment is to match your existing pump's part number to the ones listed in our Part Number Cross-Reference table, such as 3857794 or 3858847. You can also check your engine model code against the Compatible Engine Models list.

What are the signs that my raw water pump needs a rebuild?

Common symptoms include engine overheating at idle or low speeds, a noticeable reduction in water flow from the exhaust, visible water leaks from the pump body, or a grinding/rattling noise indicating worn bearings.

Does this kit include the camshaft?

Some variations of this rebuild kit include the camshaft, while others do not. It is critical to check the Package Contents list and review the product images on this page to confirm the exact contents of the kit you are purchasing.

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.