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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
- Safety First: Disconnect the boat's battery before beginning any work.
- Drain Coolant: Place a catch pan under the engine and drain the raw water cooling system.
- Remove Hoses: Loosen the hose clamps and carefully detach the inlet and outlet hoses from the pump.
- Unbolt Old Pump: Remove the mounting bolts securing the old sea water pump to the engine block.
- 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.
- Position Gasket: Place the new gasket onto the cleaned mounting surface, aligning it with the bolt holes.
- 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.
- Reconnect Hoses: Reattach the raw water hoses to the new pump and securely tighten the clamps.
- 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:
- 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