Marine Thermostat Kit 160°F – Fits OMC Cobra & Volvo Penta 3.8L-7.5L V6/V8 Engines (Replaces 383307, 3856961)

Vendor: JLM Marine
Availability: In Stock
Product Type: Thermostat
$24.50
$24.50
Subtotal: $24.50

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Marine Thermostat Kit 160°F – Fits OMC Cobra & Volvo Penta 3.8L - 7.5L V6/V8 Engines (Replaces 383307, 3856961) - JLM Marine Boat Parts Limited

Marine Thermostat Kit 160°F – Fits OMC Cobra & Volvo Penta 3.8L-7.5L V6/V8 Engines (Replaces 383307, 3856961)

$24.50

Marine Thermostat Kit 160°F – Fits OMC Cobra & Volvo Penta 3.8L-7.5L V6/V8 Engines (Replaces 383307, 3856961)

$24.50

Marine Thermostat Kit 160°F – Fits OMC Cobra & Volvo Penta 3.8L-7.5L V6/V8 Engines

This 160°F (71°C) thermostat kit provides all the necessary components, including the thermostat and required gaskets, for a complete installation on a wide range of OMC Cobra and Volvo Penta marine engines. It is designed to restore proper engine operating temperature for optimal performance and efficiency.

Engine compatibility includes OMC Cobra 3.8L to 7.5L V6 and V8 sterndrive models (1969–1988) and Volvo Penta four-stroke V6/V8 engines (4.3L, 5.0L, 5.7L, 5.8L) across the GL, GS, Gi, FL, Fi, and FSi series.

  • Engineered for direct OEM replacement, ensuring proper fit and function.
  • Maintains a consistent engine temperature of 160°F (71°C).
  • Kit includes one thermostat and all gaskets needed for installation.

Part Number Cross-Reference

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

Brand Part Number
OMC 379754
OMC 383307
OMC 3852216
OMC / Volvo Penta 3856961
Sierra 18-3653
Sierra 18-3554
GLM 13430
GLM 13060
Mallory 9-43156
Mallory 9-43021

Compatible Engine Models

Confirm your engine model/year in the table below.

OMC Cobra (Sterndrive & Marine Engines)

Brand Model Rated HP Stroke Years OEM Part No. Notes
OMC 3.8L 80-120 4-Stroke 1981-1985 383307 Small thermostat version
OMC 4.3L 120-205 4-Stroke 1985-1986 383307 Small thermostat version
OMC 5.0L 140-230 4-Stroke 1982-1988 383307 Small thermostat version
OMC 5.7L 175-260 4-Stroke 1982-1988 383307 Small thermostat version
OMC 7.5L 320-330 4-Stroke 1982-1988 383307 Small thermostat version
OMC 90 90 4-Stroke 1970 383307 Outdrive model
OMC 100 100 4-Stroke 1972-1973 383307 Outdrive model
OMC 120 120 4-Stroke 1969-1980 383307 Outdrive model
OMC 140 140 4-Stroke 1973-1980 383307 Outdrive model
OMC 155 155 4-Stroke 1969-1972 383307 Outdrive model
OMC 165-175 165-175 4-Stroke 1972-1977 383307 Outdrive models
OMC 185-200 185-200 4-Stroke 1978-1981 383307 Outdrive models
OMC 210-245 210-245 4-Stroke 1969-1975 383307 Outdrive models
OMC 250-260 250-260 4-Stroke 1970-1981 383307 Outdrive models
OMC 305-454 305-454 4-Stroke 1977-1982 383307 Outdrive models

Volvo Penta Marine Engines

Brand Model Rated HP Stroke OEM Part No. Notes
Volvo Penta 4.3GL/GS/Gi 140-225 4-Stroke 3856961 V6 Engine
Volvo Penta 5.0FL/Fi 170-220 4-Stroke 3856961 V8 Engine
Volvo Penta 5.7GL/Gi 200-280 4-Stroke 3856961 V8 Engine
Volvo Penta 5.8FL/Fi/FSi 200-300 4-Stroke 3856961 V8 Engine
Volvo Penta V6-200/225/225E 200-225 4-Stroke 3856961 V6 Engine
Volvo Penta V8-225/270/300/320/380 225-380 4-Stroke 3856961 V8 Engine

Technical Specifications

Specification Value
Product Type Marine Engine Thermostat Kit
Temperature Rating 160°F (71°C)
Installation Direct OEM replacement
Housing Color Silver/metallic
Weight 2.82 oz (0.08 kg)
Application Small thermostat applications in OMC and Volvo Penta engines
Production Standard ISO9002 certified factory
Warranty Manufacturer warranty (varies by supplier)

Package Contents

  • 1 x Thermostat (383307)
  • 1 x O-ring (3852071)
  • 1 x Gasket (314809)
  • 1 x Gasket (313416)
  • 1 x Housing Gasket (3852111)
  • 1 x Installation Instructions (when included by manufacturer)

Installation Guide

  1. Safety First: Ensure the engine is completely cool and disconnect the battery terminals.
  2. Drain Coolant: Place a catch pan under the engine and carefully drain the cooling system.
  3. Access Housing: Locate the thermostat housing. It is typically on top of the engine where the main coolant hose attaches. Remove any components blocking access.
  4. Remove Old Thermostat: Unscrew the bolts holding the thermostat housing cover. Remove the cover and lift out the old thermostat and its gasket or O-ring.
  5. Clean Surfaces: Thoroughly clean any old gasket material or corrosion from both the housing and the engine block mounting surfaces.
  6. Install New Kit: Place the new thermostat into the housing, ensuring it is oriented correctly (spring side facing the engine). Position the new gasket or O-ring.
  7. Reassemble: Re-attach the housing cover and tighten the bolts evenly to the manufacturer's recommended torque specification. Do not overtighten.
  8. Refill and Check: Reconnect all hoses, close the drain plug, and refill the cooling system with the appropriate coolant. Start the engine and check for any leaks around the housing as it comes up to temperature.

Troubleshooting & FAQ

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

A: The best way is to match your existing part number to the ones listed in our cross-reference table. You can also check your engine model and year against the compatibility tables provided for OMC Cobra and Volvo Penta engines. When in doubt, visual comparison with your old part is recommended.

Q: What is the operating temperature of this thermostat?

A: This is a 160°F (71°C) thermostat, which is a standard temperature for many of the listed V6 and V8 marine engines.

Q: What parts are included in the kit?

A: The kit includes the thermostat itself, one O-ring, and three different gaskets to fit various housing applications. This ensures you have the correct components for a successful installation without needing to source parts separately.

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.

We can ship to virtually any address in the world with free shipping available for most regions.

For our typical US and Canadian customers , our shipping timeframes are as follows:

  • Amazon FBA: orders will be delivered within 1-5 business days after placing the order (during certain special periods such as major promotions, Christmas, etc., the delivery time of Amazon FBA may be affected).
  • US warehouse shipment: orders will be delivered within 5 days after placing the order.
  • China warehouse shipment: orders will be delivered about 12 days after placing the order.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

Founded in 2002, JLM Marine has established itself as a dedicated manufacturer of high-quality marine parts, based in China. Our commitment to excellence in manufacturing has earned us the trust of top marine brands globally.

As a direct supplier, we bypass intermediaries, which allows us to offer competitive prices without compromising on quality. This approach not only supports cost-efficiency but also ensures that our customers receive the best value directly from the source.

We are excited to expand our reach through retail channels, bringing our expertise and commitment to quality directly to boat owners and enthusiasts worldwide.

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