SKU: 33751527852

Thermostat Repair Kit – Fits OMC Cobra 120/140, Volvo Penta 2.5L & 3.0L (Replaces 3853799, 982554)

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Description

Thermostat Repair Kit – Fits OMC Cobra 120/140, Volvo Penta 2.5L & 3.0L (Replaces 3853799, 982554)Thermostat Repair Kit Fits OMC Cobra 120 140, Volvo Penta 2. 5L & 3. 0L This thermostat repair kit is designed for a range of OMC Cobra and Volvo Penta sterndrive engines. It ensures your engine maintains the correct operating temperature for optimal performance and efficiency. This kit is a direct replacement for OMC part numbers 3853799, 982554, and 778064; Sierra 18 3670; and GLM 13440. Operating Temperature: 160F (71C) Installation: Direct fit for

Thermostat Repair Kit – Fits OMC Cobra 120/140, Volvo Penta 2.5L & 3.0L

This thermostat repair kit is designed for a range of OMC Cobra and Volvo Penta sterndrive engines. It ensures your engine maintains the correct operating temperature for optimal performance and efficiency.

This kit is a direct replacement for OMC part numbers 3853799, 982554, and 778064; Sierra 18-3670; and GLM 13440.

  • Operating Temperature: 160°F (71°C)
  • Installation: Direct fit for specified models
  • Complete Kit: Includes thermostat and necessary housing gaskets for a full replacement.

Part Number Cross-Reference

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

Brand Part Number
OMC 3853799
OMC 982554
OMC 778064
Sierra 18-3670
GLM 13440

Compatible Engine Models

Confirm your engine model/year in the table below.

OMC

Brand Model Rated HP Stroke Years OEM Part No. Notes
OMC Cobra 120 4-Stroke 1980-1981 3853799 Also known as 982554
OMC Cobra 140 4-Stroke 1980-1981 3853799 Also known as 982554
OMC Sterndrive 2.5L (252ci) 4-Stroke 1982-1986 3853799 Also known as 982554
OMC Sterndrive 3.0L (302ci) 4-Stroke 1982-1998 3853799 Also known as 982554

Volvo Penta

Brand Model Stroke Notes
Volvo Penta 3.0GLP 4-Stroke Fits 4 cylinder models 1968 and newer
Volvo Penta 3.0GLM 4-Stroke Fits 4 cylinder models 1968 and newer
Volvo Penta 3.0GSM 4-Stroke Fits 4 cylinder models 1968 and newer
Volvo Penta 3.0GSP 4-Stroke Fits 4 cylinder models 1968 and newer

Technical Specifications

Specification Value
Product Type Thermostat Repair Kit
Installation Direct OEM replacement
Temperature Rating 160°F (71°C)
Application Marine sterndrive engines
Other Technical Attributes Includes thermostat and housing gaskets

Package Contents

  • 1 x Thermostat (Replaces 3853799/982554/778064)
  • 1 x Thermostat Housing Cover Gasket (Replaces 314809/3852127/777906)
  • 1 x Thermostat Gasket (Replaces 313416/3852120/777848)

Installation Guide

  1. Safety First: Ensure the engine is completely cool before starting. Disconnect the battery.
  2. Drain Coolant: Place a drain pan under the thermostat housing and drain the coolant to a level below the housing.
  3. Locate Housing: Identify the thermostat housing, typically located where the main coolant hose from the engine connects to the cylinder head or intake manifold.
  4. Remove Housing Cover: Loosen and remove the bolts securing the thermostat housing cover.
  5. Remove Old Thermostat: Carefully lift the old thermostat out of the housing. Note its orientation.
  6. Clean Surfaces: Scrape away any old gasket material from both the housing and the cover mating surfaces. Ensure surfaces are clean and dry.
  7. Install New Gaskets: Place the new thermostat gasket and housing cover gasket in position.
  8. Install New Thermostat: Insert the new thermostat into the housing, making sure it is oriented correctly (spring-side towards the engine).
  9. Reattach Cover: Secure the housing cover and tighten the bolts evenly to the manufacturer's recommended torque.
  10. Refill Coolant: Refill the cooling system with the appropriate coolant mixture.
  11. Check for Leaks: Reconnect the battery. Start the engine and let it run, checking for any leaks around the thermostat housing.
  12. Final Check: Once the engine reaches operating temperature, check the coolant level and top off if necessary.

Troubleshooting & FAQ

Q: How do I confirm this thermostat kit will fit my engine?

A: Please review the Compatible Engine Models tables provided on this page. Cross-reference your engine's brand, model, and year to ensure compatibility. Verifying part numbers against our cross-reference table is also recommended.

Q: What are the signs of a failing thermostat?

A: Common symptoms include engine overheating (temperature gauge in the red) or the engine not reaching its normal operating temperature (running too cool). Inaccurate temperature gauge readings can also indicate a problem.

Q: What is the temperature rating of this thermostat?

A: This thermostat is rated to open at 160°F (71°C), which is the standard specification for the listed engine applications.

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: 33751527852

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