Sea Water Pump – Fits Volvo Penta, MerCruiser, OMC 4.3L, 5.0L, 5.7L V6/V8 (Replaces 3853850, 8M0113734)
SKU: 6063878779

Sea Water Pump – Fits Volvo Penta, MerCruiser, OMC 4.3L, 5.0L, 5.7L V6/V8 (Replaces 3853850, 8M0113734)

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Description

Sea Water Pump – Fits Volvo Penta, MerCruiser, OMC 4.3L, 5.0L, 5.7L V6/V8 (Replaces 3853850, 8M0113734)Sea Water Pump Fits Volvo Penta, MerCruiser, OMC 4. 3L, 5. 0L, 5. 7L V6 V8 This marine water pump is a bi directional circulation pump designed for GM V6 V8 marine engines used in raw water cooling systems across multiple brands. It is a direct, engine mounted replacement for sterndrive and inboard applications. This pump fits a wide range of models, including Volvo Penta 4. 3L, 5. 0L, & 5. 7L engines (1973+); MerCruiser 4. 3L V6, 5. 0L & 5. 7L V8

Sea Water Pump – Fits Volvo Penta, MerCruiser, OMC 4.3L, 5.0L, 5.7L V6/V8

This marine water pump is a bi-directional circulation pump designed for GM V6/V8 marine engines used in raw water cooling systems across multiple brands. It is a direct, engine-mounted replacement for sterndrive and inboard applications.

This pump fits a wide range of models, including Volvo Penta 4.3L, 5.0L, & 5.7L engines (1973+); MerCruiser 4.3L V6, 5.0L & 5.7L V8 engines (1963–2014); and OMC V6/V8 engines (1968–1998). It also fits certain Indmar, Pleasurecraft, and Chrysler small block cooling systems.

  • Direct Replacement: Replaces OEM part numbers MerCruiser 8M0113734/3853850, Volvo Penta 3853850, OMC 3853850, and Sierra 18-3599-2.
  • Durable Construction: Features a steel housing with a stainless steel back plate and impeller cover for enhanced corrosion resistance.
  • Complete Kit: Includes the sea water pump assembly and a new gasket set for a complete installation.

Part Number Cross-Reference

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

Brand Part Number
MerCruiser 8M0113734, 3853850
Volvo Penta 3853850
OMC 3853850
Sierra 18-3599-2

Compatible Engine Models

Confirm your engine model/year in the table below. For MerCruiser owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

For all other makes, confirm your engine model/year in the tables below.

MerCruiser Applications

Brand Model Rated HP Stroke Years OEM Part No. Notes
MerCruiser 4.3L V6 140-200 HP 4-Stroke Up to 2007 8M0113734/3853850 Not applicable to 2008+ 4.3L engines
MerCruiser 5.0L V8 155-205 HP 4-Stroke All years 8M0113734/3853850
MerCruiser 5.7L V8 230-260 HP 4-Stroke All years 8M0113734/3853850
MerCruiser 6.2L V8 260+ HP 4-Stroke All years 8M0113734/3853850

Volvo Penta Applications

Brand Model Rated HP Stroke Years OEM Part No.
Volvo Penta 4.3GL, 4.3GXi 190-225 HP 4-Stroke 1973 and later 3853850
Volvo Penta 5.0GL, 5.0GXi 200+ HP 4-Stroke 1973 and later 3853850
Volvo Penta 5.7GL, 5.7GXi 250+ HP 4-Stroke 1973 and later 3853850

OMC Applications

Brand Model Rated HP Stroke Years OEM Part No.
OMC 4.3L V6 140-200 HP 4-Stroke 1968-1998 3853850
OMC 5.0L V8 155-205 HP 4-Stroke 1968-1998 3853850
OMC 5.7L V8 230-260 HP 4-Stroke 1968-1998 3853850

Indmar/Chrysler/Other Applications

Brand Model Rated HP Stroke
Indmar 4.3L, 5.0L, 5.7L 140-260 HP 4-Stroke
Chrysler 4.3L, 5.0L, 5.7L 140-260 HP 4-Stroke
Pleasurecraft Small Block V6/V8 140-260 HP 4-Stroke

Technical Specifications

Specification Value
Product Type Sea Water Circulation Pump
Installation Engine-mounted
Connection Brass fittings
Housing Material Steel with stainless steel back plate
Housing Color Black
Fitting Type Brass tubes
Warranty Lifetime (from certain sellers)
Other Technical Attributes Bi-directional design, stainless steel impeller cover

Package Contents

  • 1 x Sea Water Pump Assembly (Replaces 8M0113734/3853850)
  • 1 x Gasket Set (Replaces Sierra 18-0891)

Installation Guide

  1. Safety First: Disconnect the boat's battery before beginning any work.
  2. Drain Coolant: Place a catch pan under the engine and drain the raw water cooling system.
  3. Remove Hoses: Loosen the hose clamps and carefully detach the inlet and outlet hoses from the pump.
  4. Unbolt Old Pump: Remove the mounting bolts securing the old sea water pump to the engine block.
  5. Clean Surface: Thoroughly clean the engine mounting surface to remove any old gasket material or corrosion. A clean surface is crucial for a good seal.
  6. Position Gasket: Place the new gasket onto the cleaned mounting surface, aligning it with the bolt holes.
  7. Mount New Pump: Install the new sea water pump, ensuring it sits flush against the gasket. Hand-tighten the bolts first, then torque them to the manufacturer's specification.
  8. Reconnect Hoses: Reattach the raw water hoses to the new pump and securely tighten the clamps.
  9. Refill and Test: Reconnect the battery. Refill the cooling system with the appropriate coolant. Start the engine and carefully check for any leaks around the pump and hoses.

Troubleshooting & FAQ

Q: How do I confirm this pump fits my engine?
A: Start by checking the compatible engine model tables provided for MerCruiser, Volvo Penta, and OMC. This pump fits GM-based V6 and V8 marine engines and is a direct replacement for part numbers 8M0113734 and 3853850. Important: It is not compatible with MerCruiser 4.3L V6 engines from 2008 and newer.

Q: What are the signs my sea water pump is failing?
A: Common signs of a failing pump include the engine running hotter than normal or overheating, visible water leaks from the pump body or weep holes, a grinding or rattling noise coming from the pump assembly, or noticeably reduced water flow from the exhaust port.

Q: Is this pump bi-directional? What does that mean?
A: Yes, this pump features a bi-directional design. This means it can circulate water effectively regardless of the engine's rotational direction, making it compatible with both standard and reverse-rotation engines without modification.

Q: OEM vs. Aftermarket?
A: 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.

Q: How fast do you ship and how much does it cost?
A: 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.

Q: What is your warranty and return policy?
A: 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.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 6063878779

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