SKU: 20740215751

Circulation Water Pump for OMC 2.5 3.0 4.0 L 984360

Sale price$62.96 Regular price$69.95
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Description

Circulation Water Pump for OMC 2.5 3.0 4.0 L 984360Circulation Water Pump Fits OMC 2. 5L, 3. 0L, 4. 0L Marine Engines This is an aftermarket circulation water pump for OMC and Volvo Penta stern drive marine engines. It is designed to fit 2. 5L, 3. 0L, and 4. 0L GM based marine engines from 19821993. This component directly replaces OMC part numbers 984360, 986779, 3854017, 3858340, 509356 and Volvo Penta part numbers 3854017, 3858340. Engine block mounted circulation pump for raw water cooling

Circulation Water Pump – Fits OMC 2.5L, 3.0L, 4.0L Marine Engines

This is an aftermarket circulation water pump for OMC and Volvo Penta stern drive marine engines. It is designed to fit 2.5L, 3.0L, and 4.0L GM-based marine engines from 1982–1993.

This component directly replaces OMC part numbers 984360, 986779, 3854017, 3858340, 509356 and Volvo Penta part numbers 3854017, 3858340.

  • Engine block-mounted circulation pump for raw water cooling systems.
  • Features a durable cast aluminum housing with a brass impeller for corrosion resistance in fresh and saltwater.
  • Includes the necessary mounting gasket for a complete installation.

Part Number Cross-Reference

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

Brand Part Number
OMC 984360
OMC 986779
OMC 3854017
OMC 3858340
OMC 509356
Volvo Penta 3854017
Volvo Penta 3858340
Sierra 18-3575
Mallory 9-42605
MerCruiser 884727
MerCruiser 8M0113733
MerCruiser 65142A1
MerCruiser 879345T99
GLM 15100

Compatible Engine Models

Confirm your engine model/year in the table below.

Brand Model Rated HP Stroke Years OEM Part No. Notes
OMC 2.5L 120-140 HP 4-Stroke 1982-1986 984360 Stern drive applications
OMC 3.0L 130-140 HP 4-Stroke 1982-1993 984360, 986779 Stern drive applications
OMC 4.0L - 4-Stroke 1989-1993 984360 Used in Sea Drive models
Volvo Penta 2.5L 120 HP 4-Stroke 1982-1986 3854017 Stern drive applications
Volvo Penta 3.0L 130-140 HP 4-Stroke 1982-1993 3854017, 3858340 Stern drive applications
Volvo Penta 4.0L - 4-Stroke 1989-1993 3854017 Sea Drive applications

Technical Specifications

Specification Value
Product Type Circulation Water Pump (Raw Water Pump)
Installation Direct bolt-on replacement
Connection Direct mount to engine block
Housing Material Cast aluminum with brass impeller
Housing Color Natural metal/silver
Fitting Type Direct mount
Other Technical Attributes Brass impeller for salt and fresh water applications

Package Contents

  • 1 x Circulation Water Pump (984360/3854017)
  • 1 x Gasket

Explosion Diagram

Installation Guide

  1. Drain the cooling system completely to avoid spills. Disconnect the negative battery terminal.
  2. Loosen the belt tensioner and remove the serpentine belt from the pump pulley.
  3. Unscrew the mounting bolts holding the old water pump to the engine block.
  4. Gently tap the old pump to break the seal and remove it. Be prepared for some residual coolant leakage.
  5. Clean the mounting surface on the engine block thoroughly, removing all old gasket material and residue.
  6. Place the new gasket onto the engine block, aligning it with the bolt holes.
  7. Mount the new water pump, ensuring it sits flush against the gasket.
  8. Hand-tighten the mounting bolts, then torque them to the manufacturer's specified values in a star pattern.
  9. Reinstall the pulley and serpentine belt, ensuring proper tension.
  10. Reconnect all hoses to the new pump and secure the clamps.
  11. Refill the cooling system with the appropriate coolant mixture. Reconnect the battery.
  12. Start the engine, check for leaks, and top off the coolant as the system bleeds air.

Troubleshooting & FAQ

Q: How do I confirm this pump fits my OMC or Volvo Penta engine?

A: The best method is to match the part number from your old pump to one of the numbers listed in our cross-reference table. Additionally, verify your engine model and year falls within the ranges specified in the compatible models list.

Q: What makes this pump suitable for saltwater use?

A: This pump is constructed with a brass impeller, which offers superior corrosion resistance compared to standard steel or plastic impellers, making it ideal for both saltwater and freshwater marine environments.

Q: What are the common signs of a failing circulation water pump?

A: Key symptoms include engine overheating, visible coolant leaks from the pump's weep hole or gasket, a wobbly or noisy pump pulley, or a loose-feeling pump shaft.

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: 20740215751

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4.7 ★★★★★
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Mad Jack
Louisville, US
★★★★★ 5
Inexpensive walls.
Color: Grey, Size: 34" - 3 Panel, Color: Grey, Size: 34" - 3 Panel
We had a hot request for a workstation in the warehouse with some privacy. These have worked great. Easy to assemble. They are lightweight and stable. This was an inexpensive solution that looks professional. Our client loved it.
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Reviewed in the United States on August 1, 2025
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Amber
Massapequa, US
★★★★★ 1
Dont wait! Assemble right away! Just in case you need to return it.
Color: Black, Size: 22" - 4 Panel
Ok, I like the idea of this but the assembly is frustrating. One side lined up perfectly with the holes however, the small bars that connect the screen to base is not lining up. I think it's do the fabric the screen or divider is made of. It's not stretchy. I brought this months ago and just opened it today. I'm upset and don't even think returning it is possible. If the material was a bit longer or stretchy to give a little room to work with this divider would be great. However, I'm not sure what I can use it for since I'm unable to attach it to the bottom. Beware! Don't wait like me. Tip for the manufacturer. Next time invest in Velcro dividers so the fabric can be adjusted with ease. Literally if I take the screen off the frame aligns perfectly. However, it defeats its purpose of privacy. I might buy some material myself and create a more flexible divider. Or I'll buy Velcro myself and attach to the bottom. I don't know yet.
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Reviewed in the United States on December 15, 2025
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Raul A. Lugo
Massapequa, US
★★★★★ 5
Very practical and so far its working great.
This outlet extender is super practical! I installed it just behind a night stand to extend the outlet above it. The built in USB C ports can fast charge a Samsung S25 on a MagSafe base, so they are at least good for 15W. The outlet came disassembled and very well packed. There are 3 extensions included to change the reach of the outlet, but for a nightstand, a single extension was all that is needed. The outlets on the extender are nice and tight and like mentioned before, the USB ports work well and are very convenient to have. There is also an On/Off switch at the top of the extender you can use to turn off all the devices connected to it. Overall a great kit, that seems well made and should hopefully last a long time. So far I can recommend it.
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Reviewed in the United States on June 1, 2026
T
Thomas MacEntee
Whiting, US
★★★★★ 5
Finally, a smart solution for that impossible outlet behind the couch
I have one specific outlet in my living room that drives me absolutely crazy. It’s directly behind our heavy sectional sofa, and every time I need to plug in a laptop charger or the vacuum, I have to literally wrestle the furniture away from the wall and blindly reach down into the dark. When I saw this TROND extendable outlet stick, I bought it immediately hoping it would solve that exact headache. It totally did. The design is brilliant. It’s modular, so you can adjust the length anywhere from 16 to 39 inches depending on how many segments you screw together. I used all three pieces so the actual power strip sits right at the perfect height just above the back of the couch. Now I have five outlets and two USB-C ports right where I can actually reach them. The USB-C ports charge my phone quickly, and having built-in surge protection gives me peace of mind for my electronics. Plus, the 360-degree rotating plug lies completely flat, so the couch can push all the way back against the wall without bending any cords. I did run into one quirky issue when installing it, which I took a couple of photos of to show you. In the US, our wall outlets are usually installed with the round ground prong on the bottom. However, the plug on this device is oriented with the ground prong on the top. If you plug it into a standard outlet, the cord wants to run upwards instead of down. Fortunately, it’s an incredibly easy DIY fix. I just went to my breaker box, shut off the power to the living room, unscrewed the wall outlet, flipped it upside down so the ground prong was on top, and screwed it back in. It took less than five minutes and completely solved the problem. Even with that minor orientation quirk, this thing is a total game-changer for awkward living room layouts. If you're tired of scraping your knuckles trying to reach behind furniture, this is worth every penny.
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Reviewed in the United States on June 2, 2026
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C. L.
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★★★★★ 5
Perfect kitchen wall outlet
Size: 3 FT, Size: 3 FT
This is the perfect solution for a kitchen wall outlet that is plugged into the unused second socket behind the refrigerator. Now I can leave my blender and food processor on the small countertop next to my refrigerator. So convenient! And also a good spot to charge my cell phone.
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