SKU: 62545242094

Thermostat Kit (160°F/71°C) – Fits OMC Cobra & Volvo Penta 3.8-7.5L V6/V8 (Replaces 383307, 18-3653)

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Description

Thermostat Kit (160°F/71°C) – Fits OMC Cobra & Volvo Penta 3.8-7.5L V6/V8 (Replaces 383307, 18-3653)Thermostat Kit (160F 71C) Fits OMC Cobra & Volvo Penta 3. 8 7. 5L V6 V8 This thermostat kit is designed for a wide range of OMC Cobra and Volvo Penta sterndrive engines. It fits V6 and V8 models from 3. 8L to 7. 5L (90 454HP) manufactured from 1968 and up, ensuring proper engine operating temperature for optimal performance and efficiency. This kit serves as a direct replacement for multiple part numbers, including Sierra 18 3653, OMC 383307 and

Thermostat Kit (160°F/71°C) – Fits OMC Cobra & Volvo Penta 3.8-7.5L V6/V8

This thermostat kit is designed for a wide range of OMC Cobra and Volvo Penta sterndrive engines. It fits V6 and V8 models from 3.8L to 7.5L (90-454HP) manufactured from 1968 and up, ensuring proper engine operating temperature for optimal performance and efficiency.

This kit serves as a direct replacement for multiple part numbers, including Sierra 18-3653, OMC 383307 and 379754, Volvo Penta 3856961, GLM 13430 and 13060, and Mallory 9-43156 and 9-43021.

  • Operating Temperature: Maintains a consistent engine temperature of 160°F (71°C).
  • Complete Kit: Includes the thermostat, O-ring, and necessary gaskets for a full replacement.
  • Installation Type: Engineered for direct OEM replacement with no modifications required.

Part Number Cross-Reference

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

Brand Part Number
Sierra 18-3653
OMC 383307
OMC 379754
Volvo Penta 3856961
GLM 13430
GLM 13060
Mallory 9-43156
Mallory 9-43021

Compatible Engine Models

Confirm your engine model/year in the table below.

OMC Cobra

Model Rated HP Years OEM Part No.
3.8L [Data Needed] 1981-1985 383307
4.3L [Data Needed] 1985-1986 383307
5.0L [Data Needed] 1982-1988 383307
5.7L [Data Needed] 1982-1988 383307
90 90 1970 383307
100 100 1972-1973 383307
120 120 1969-1980 383307
140 140 1973-1980 383307
155 155 1969-1972 383307
165 165 1972-1976 383307
170 170 1974 383307
175 175 1975-1977 383307
185 185 1978-1980 383307
190 190 1974-1977 383307
200 200 1979-1981 383307
210 210 1969-1972 383307
215 215 1971 383307
225 225 1971 383307
230 230 1979-1981 383307
235 235 1971, 1975-1977 383307
240 240 1978 383307
245 245 1972-1975 383307
250 250 1970-1973, 1979 383307
260 260 1979-1981 383307
305 305 1977-1982 383307
350 350 1977-1982 383307
454 454 1977-1982 383307

Volvo Penta

Model OEM Part No.
4.3GL 3856961
5.7GL 3856961
4.3GS 3856961
5.7Gi 3856961
4.3Gi 3856961
5.8FL 3856961
5.0FL 3856961
5.8Fi 3856961
5.0Fi 3856961
5.8FSi 3856961

Technical Specifications

Specification Value
Product Type Marine Engine Thermostat Kit
Installation Direct OEM Replacement
Temperature Rating 160°F (71°C)
Application Sterndrive Engines
Fit Type V6 & V8 Marine Engines
Engine Displacement 3.8L, 4.3L, 5.0L, 5.7L, 5.8L, 7.5L

Package Contents

  • 1 x Thermostat (Replaces 383307/3856961)
  • 1 x O-ring (3852071)
  • 1 x Gasket (314809)
  • 1 x Gasket (313416)
  • 1 x Housing Gasket (3852111)
  • 1 x Installation Instructions

Installation Guide

  1. Drain Coolant: Ensure the engine is cool. Drain the engine block and manifolds a sufficient amount to bring the coolant level below the thermostat housing.
  2. Locate Housing: Find the thermostat housing, typically where the main coolant hose from the circulation pump connects to the top of the engine.
  3. Remove Housing: Loosen and remove the bolts securing the housing. Carefully separate the housing from the engine block or manifold.
  4. Remove Old Parts: Take out the old thermostat and peel off the old gasket or O-ring. Note the thermostat's orientation before removal.
  5. Clean Surfaces: Thoroughly clean the mating surfaces of both the housing and the engine block to remove any old gasket material or corrosion.
  6. Install New Thermostat: Place the new thermostat into the recessed groove, ensuring it is oriented correctly. Install the new gasket or O-ring as required.
  7. Reassemble: Re-position the housing and tighten the bolts to the manufacturer's recommended torque specifications. Do not overtighten.
  8. Refill and Check: Refill the cooling system. Start the engine and let it warm up, checking carefully for any leaks around the housing. Top off coolant as needed.

Troubleshooting & FAQ

Q: How can I confirm this thermostat kit fits my specific engine?

A: The best way to ensure fitment is to check your engine's model, year, and OEM part number against the compatibility tables provided on this page. Cross-reference your existing thermostat's part number with the numbers listed, such as OMC 383307 or Volvo Penta 3856961.

Q: What are common signs that my thermostat is failing?

A: Common symptoms include engine overheating (running hot) or engine failing to reach operating temperature (running cold). You may also notice erratic temperature gauge readings or coolant leaks around the thermostat housing.

Q: How often should I replace my boat's thermostat?

A: Thermostats are a critical maintenance item. It is recommended to inspect them annually and replace them every 2-3 years, or as part of your routine cooling system service, to prevent overheating and ensure engine longevity.

Q: Is this a 140°F or 160°F thermostat?

A: This is a 160°F (71°C) thermostat, designed for raw water cooled V6 and V8 engines to ensure they reach the correct operating temperature for efficiency and performance.

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: 62545242094

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ediebegonia
Louisville, US
★★★★★ 3
Pack's Promise was okay but not great
Format: Kindle
Pack's Promise was okay but not great. I won't recommend it to anyone that I know. PRO: * Very likable characters * Lots of steamy scenes that are written very well * The spelling and grammar are good * The punctuation is good with the exception of using hyphens instead of commas. Lots of hyphens. Lots and lots of hyphens. CON: * Almost no interactions with any characters outside of Madison and the pack * Nearly no plot. They meet, get together for a heat, agree to make it permanent, done * Quite a few typos such as extraneous words, missing words and words out of order THINGS TO KNOW: * More steamy scenes than storytelling * A lot of MM & MMM, some MFMM during heat
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Reviewed in the United States on January 5, 2023
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LJM
Belleville, US
★★★★★ 5
such a good read
Format: Kindle
Madison, Lucas, Grey and Rian were made for each other!!! First time reading from this author and I’m not disappointed!!! Absolutely love the Love in this book and couldn’t ask for a better OV!
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Reviewed in the United States on October 25, 2023
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Beccaroo
Houston, US
★★★★★ 4
Fluffy and Nice Omegaverse
Format: Kindle
… this would have made 5 stars but for 2 reasons. A.) there were quite a few typos; misspelled words, missing quotations, “the his” mistakes, and various signs that maybe a proofread would do good. B.) the writing was quite textbook. Late blooming omega is struggling with her new self, finds a absurdly wealthy pack of alphas, every thing is almost insta-love but she resists, then decides to love herself and let everyone be happy. Rian was my favourite (obviously the author’s favourite too because he got the most page time) but I wish we could see more of his CEO side? He went to work maybe ONCE the entire time. Gray was supposed to be the “growly one” but he turned out to be puppy dog. Lucas was a genius brainiac doctor - but also super alpha with an aggressive hindbrain with a breeding k*nk?? And then there was no actual “breeding”?? Spice 3/5 - normally omegaverse books are super high on messy smut but this was tamer. Romance 3/5 - insta-love that was then resisted because of personal hangup’s Plot 2/5 - weird paced head hopping, showing the same scene from different POV’s that made me feel like it was 2 steps backward, 1 step forward. Humour 4/5 - there were a dozen lines that genuinely made me chuckle out loud Would have been five stars but the lack of proofreading and the predictable plot made me unable to get up to ADORED IT level - four stars is still and official ENJOYED IT, y’all. This isn’t a bad rating. The “Club Heat” has intriguing possibilities so I’m going to give the second one a shot.
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Reviewed in the United States on March 31, 2023
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Ruth Ann Burt
Boise, US
★★★★★ 5
Great book
Format: Kindle
I absolutely feel in love with all 4 characters!!! The bedroom scenes were 🌋🌡🔥🔥🔥. I couldn't put this book down!!! I'm hooked for the whole series Book 2 here I come!!!!! Its a fun easy book and story to read!!
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Reviewed in the United States on October 4, 2024
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Danyelle
Louisville, US
★★★★★ 4
Fun with a late blooming omega
Format: Kindle
I like this book. The story is fun, cute, and sexy. There's just a little drama, some excellent, steamy scenes, and a fairly good relationship building storyline. I especially like how all the main characters are a bit older than the usual 20 somethings I tend to see in this kind of book. Having said that, I wish there were more descriptions of the places, as well as the food in the fancy restaurant. I enjoyed the cocktails at the club, so I missed that kind of detail when Gray took Madison on a dinner date. I also wish there had been more interaction between Lucas and Madison, and Lucas and Rian. It felt a bit lopsided, with a focus on Rian, Madison, and Gray. I wish it had been proofread - there are a lot of typos, but nothing too distracting.
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Reviewed in the United States on September 12, 2022

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