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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Catie
Lexington, US
★★★★★ 5
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Style: SPF 15, Size: 8 Fl Oz (Pack of 1)
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Reviewed in the United States on May 2, 2026
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Brad007
Phoenix, US
★★★★★ 5
Reliable protection that stays put during workouts!
Style: SPF 50, Size: 8 Fl Oz (Pack of 1)
I’ve tried many expensive name-brand sunscreens, but this Amazon Basics version performs just as well, if not better. It’s become my go-to for morning runs and trips to the beach because it actually stays on even when I’m sweating. Why I gave it 5 stars: Non-Greasy Formula: Unlike other sport sunscreens, this one absorbs quickly and doesn't leave that heavy, sticky film on my skin. Actually Water Resistant: I’ve used it for laps in the pool and long hikes; as long as I reapply as directed, I haven't had a single sunburn. No "Sting": One of the best things is that it doesn't run into my eyes and sting when I start to sweat—a huge plus for runners. Great Value: You get a generous 8-ounce bottle for a fraction of the price of "premium" brands. The fact that it’s formulated without Oxybenzone is an added bonus for peace of mind. If you’re looking for effective, no-frills sun protection for an active lifestyle, you can't beat this. It’s a staple in my gym bag now!
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Reviewed in the United States on April 6, 2026
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Igor A
Chelsea, US
★★★★★ 5
Great value and very practical
Style: SPF 50, Size: 8 Fl Oz (Pack of 6)
This sunscreen is a great value for the price. The SPF 50 protection works well and the lotion applies smoothly without feeling too greasy. It absorbs nicely and provides good coverage for outdoor activities. I especially like using these bottles to refill the sunscreen dispensers at my Airbnb for guests. It’s convenient, reliable, and affordable when you need multiple bottles available. Overall, it’s a solid everyday sunscreen and a very practical option if you need good protection at a reasonable price.
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Reviewed in the United States on March 11, 2026
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eeeggg
Bozeman, US
★★★★★ 4
good price for good product. applies well, shake and store upright
Style: SPF 50, Size: 8 Fl Oz (Pack of 1), Style: SPF 50, Size: 8 Fl Oz (Pack of 1)
I believe it is equal to the name brands It is 50 SPF Sun Protection Factor so it offers strong UV A and UV B protection which are the 2 ranges of sun rays that do the skin damage and burning. It is an easily absorbed lotion that when rubbed goes into the skin and is not visible. It is thick and goes on with a non shiny, non greasy, solid thick feeling which is what we need for it to stay on as long as possible. It feels good after being rubbed in in that it feels dry and not overly greasy or with no shine and sheen. It is a good product and offers burn protection to me in some clear-sky strong sun uses. Reapply after entering the pool water or swimming laps and after an hour (all sunscreen labels say reapply after 80 minutes which I believe is per recommendations of the federal FDA or some medical studies). I reapply often and I still get tanned but I do not want to burn.
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Reviewed in the United States on August 9, 2025
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JohnMichael Rodriguez
Bozeman, US
★★★★★ 5
Survived the sun like a pasty legend
Style: SPF 50, Size: 8 Fl Oz (Pack of 1)
I bought this sunscreen because I’m basically a human marshmallow — one hour in the sun and I’m toasted. This Amazon Basics Sport SPF 50? It’s like armor for the pale and easily crisped. I slathered it on before a full day of hiking, sweating, and pretending I enjoy direct sunlight, and guess what? No burn. Not even a pink glow. Just victory. It goes on smooth, doesn’t feel greasy, and somehow stayed put through sweat, water, and my dog licking my arm. It’s fragrance-free, which means I didn’t smell like a coconut smoothie or a chemical spill — just clean and protected. Pros: • High SPF that actually works • Sweat and water resistant — like, impressively so • No greasy residue or weird smell • Affordable and comes in a big ol’ bottle • Didn’t turn me into a lobster (the bar is low, but still) Minor feedback: It’s not fancy or trendy, but honestly, I’m here to not burn — not win a skincare award. Also, it takes a bit of rubbing in, but once it’s on, it’s locked and loaded. Final thoughts: If you want solid sun protection without the drama, this stuff delivers. Whether you’re hiking, swimming, or just trying to survive summer, it’s a reliable sidekick. Would absolutely buy again — my skin demands it.
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Reviewed in the United States on November 7, 2025

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