SKU: 6063878779

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

Sale price$59.38 Regular price$65.98
Save 10%

Pay in installments of $16.50 with ShopPay, AfterPay and Klarna

Shipping Estimate
USA
  • USA
  • CAN

Ships within 48 hours · Estimated delivery Jul 20 - Jul 25

Promo Codes Available:

For Your Every Summer RSVP, with Code: SUMMER15

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

Discover Niche Categories That Outsell

Top-Converting Item to Boost Your Average Order

4.1 ★★★★★
Based on 11 reviews
Sort
Highest Rating
Newest First
Oldest First
Product Reviews
V
vickie
Houston, US
★★★★★ 5
Best quality
Color: Purple-2, Size: 5X-Large
I don't usually write reviews,but I had to this time because I absolutely love it.The fabric quality is excellent,and it fits perfectly.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 16, 2026
L
Verified Purchase
Lori Gehring
Pawtucket, US
★★★★★ 5
Great buy
Color: Blue Slant Check, Size: Medium
Very nice material. Washes well and even travels in a suitcase without wrinkling. Color is as described and fits well. Great buy for the price.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 12, 2026
S
Verified Purchase
Samantha lankheit
Lexington, US
★★★★★ 5
Soft and vibrant
Color: Blue/Yellow, Size: Medium
The material feels great and the colors are great. The fit is true to size . Nice addition to my son’s golf shirt selection.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 22, 2026
B
Verified Purchase
Brandon C
Los Angeles, US
★★★★★ 4
Thick quality polo shirt, just maybe not for Golfing.
Color: Black/Blue, Size: Medium, Color: Black/Blue, Size: Medium
This shirt was a lot thicker than I imagined. It's built well and fits as intended, but as far as a golf shirt it is quite heavy, and I would feel as though it would cause overheating or sweating. Very thick shirt, possible better for colder golfing days and still look good. I enjoy the color and pattern. It is soft and comfortable, again just a little thinker than anticipated, not a quick dry material, but a fully cotton blend. Decent value for the money and would consider pitching others in the future but most likely not for golfing in general.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 23, 2026
K
Verified Purchase
kristen
Chelsea, US
★★★★★ 5
Good shirts
Color: Black Diamond & Dots, Size: Large
Nice shirt. Pattern true to pictures. True to size unless you're 6'2 and you want to leave the shirt untucked, it's a bit short.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 14, 2026

recommand products