SKU: 70570478727

Thermostat Kit – Fits OMC Cobra & Volvo Penta 2.5L/3.0L 120/140HP (Replaces 982554, 3853799, 18-3670)

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Description

Thermostat Kit – Fits OMC Cobra & Volvo Penta 2.5L/3.0L 120/140HP (Replaces 982554, 3853799, 18-3670)Thermostat Kit Fits OMC Cobra & Volvo Penta 2. 5L 3. 0L 120 140HP (Replaces 982554, 3853799, 18 3670) This marine thermostat kit is designed for OMC Cobra stern drives (19861993) and Volvo Penta AQ series stern drives (19861993) equipped with 2. 5L and 3. 0L (120 140 HP) gasoline engines. It serves as a direct replacement for OMC part numbers 982554 3853799, Volvo Penta 0982554, and Sierra 18 3670. Opens at a precise 143F (62C) to regulate engine

Thermostat Kit – Fits OMC Cobra & Volvo Penta 2.5L/3.0L 120/140HP (Replaces 982554, 3853799, 18-3670)

This marine thermostat kit is designed for OMC Cobra stern drives (1986–1993) and Volvo Penta AQ series stern drives (1986–1993) equipped with 2.5L and 3.0L (120-140 HP) gasoline engines.

It serves as a direct replacement for OMC part numbers 982554/3853799, Volvo Penta 0982554, and Sierra 18-3670.

  • Opens at a precise 143°F (62°C) to regulate engine temperature.
  • Includes all necessary gaskets for a complete, leak-free installation.
  • Constructed from high-grade brass and stainless steel for corrosion resistance and durability.

Part Number Cross-Reference

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

Brand Part Number
OMC 982554 / 3853799
Volvo Penta 0982554
Sierra 18-3670

Compatible Engine Models

Confirm your engine model/year in the table below.

OMC Cobra Compatible Models
Brand Model Rated HP Stroke Years OEM Part No. Notes
OMC Cobra 2.5L 120 4-Stroke 1986–1993 982554/3853799 Stern drive applications
OMC Cobra 3.0L 140 4-Stroke 1986–1993 982554/3853799 Stern drive applications

Volvo Penta Compatible Models
Brand Model Rated HP Stroke Years OEM Part No. Notes
Volvo Penta AQ Series 2.5L 120 4-Stroke 1986–1993 0982554 Stern drive applications
Volvo Penta AQ Series 3.0L 140 4-Stroke 1986–1993 0982554 Stern drive applications

Technical Specifications

Specification Value
Product Type Thermostat Kit
Installation Direct OEM Replacement
Housing Material High-grade brass and stainless steel
Temperature Rating 143°F (62°C) opening threshold
Gasket Material Precision-cut rubber composite
Other Technical Attributes ISO9002 certified manufacturing

Package Contents

  • 1 x Thermostat (pre-installed with sealing components)
  • 1 x Housing Gasket (Replaces 314809/3852127)
  • 1 x Ring Gasket (Replaces 313416/3852120)

Installation Guide

  1. Ensure the engine is completely cool before starting.
  2. Drain the engine coolant to a level below the thermostat housing.
  3. Locate and carefully remove the bolts securing the thermostat housing cover.
  4. Remove the old thermostat and gasket, taking note of its orientation.
  5. Thoroughly clean the mating surfaces of the housing and its cover, removing any old gasket material.
  6. Install the new thermostat, ensuring it is seated in the correct direction.
  7. Position the new housing gasket and reinstall the cover. Tighten bolts to the manufacturer's specified torque.
  8. Refill the cooling system with the appropriate coolant mixture.
  9. Start the engine, allow it to reach operating temperature, and carefully check for any leaks.

Troubleshooting & FAQ

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

A: This kit is designed for OMC Cobra and Volvo Penta 2.5L and 3.0L (120-140 HP) stern drive engines manufactured between 1986 and 1993. The best way to confirm fitment is to match your old part's number to one of the cross-reference numbers: OMC 982554/3853799, Volvo Penta 0982554, or Sierra 18-3670.

Q: What are the main symptoms of a faulty thermostat?

A: Common signs of failure include engine overheating, the engine failing to reach normal operating temperature (running too cool), erratic temperature gauge readings, and coolant leaks from the thermostat housing area.

Q: What is the operating temperature of this thermostat?

A: This thermostat is calibrated to begin opening at 143°F (62°C). This ensures your engine warms up correctly and maintains a stable temperature for optimal performance, fuel efficiency, and longevity.

Q: Is this an OEM or aftermarket part?

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: 70570478727

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4.0 ★★★★★
Based on 16 reviews
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A
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Atlas
Battle Creek, US
★★★★★ 5
Great! This surge protector is well designed and built for specific needs.
Nice surge protector/power strip. Good layout of outlets and the one spaced apart is really good. I also love the fact it comes with not two or three USB outlets, but four of them! This is great because there is plenty of room to plug in other devices. The tiny led lights are very small but do light up enough to see that the device is on. The on/off switch works great too and was a must have for my setup. 5 ft of cord length is just what I needed to mount the strip on the wall. (Install screws included) The flat angled plug for the wall is also just what I needed so the design here is perfect. A great value!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 16, 2025
J
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J. Rew
Lowell, US
★★★★★ 5
All The Right Features, and Well-Made
This power strip had everything I was looking for: 6 ft. cord, right-angle plug, at least 2 USB ports, white plastic case, wall-mountable, and at least 4 AC power outlets. All of that might sound pretty straightforward, but this TROND power strip is one of the very few models that meets all the criteria. Here's what I like about power strips in general, and this TROND model specifically: 1. Right-angle plug. A must in my book. Get a right-angle plug whenever possible. They are almost always more convenient and better-looking than straight standard plugs. 2. At least 1 transformer-spaced outlet. If the AC outlets are all too close together, you'll end up sacrificing 1 or 2 of them with a "wall wart" transformer. Just about everybody is plugging in at least one of these outlet-hogging transformers these days. 3. USB power ports. Like transformers, just about everybody has USB-powered stuff to plug in. If you don't have USB ports built into the power strip, then you have to use the USB power adapter which hogs up an AC outlet. I've got at least 2 USB devices to plug into this power strip at any given time, so having the built-in ports is very convenient. Another must in my book. I also like this TROND model for the little touches that make it a bigger value than the price suggests: 1. Includes mounting screws. What? Wasn't expecting that. Very cool. 2. Includes a template for drilling the mounting holes. What? I've never even seen that before. Even cooler. 3. An actual user's manual - in English - and well-written. That blew me away. I totally don't need a user's manual for a power strip, but it was very classy to see it in the box. Well played, TROND. 4. Expensive-looking power switch and power light. This power strip is much better looking than other cheap strips. The plastic is high-quality and "Apple" looking, the power switch is a cut above the generic switches in this price range, and the power indicator light a slick hidden LED that makes the whole package feel high-end. I have expensive power strips from Monster, Belkin, and Tripp-Lite, and this TROND unit appears better made and has fancier features. I'll definitely buy another TROND power strip when the time comes.
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Reviewed in the United States on December 5, 2016
E
Verified Purchase
E. Jackson
Port Orchard, US
★★★★★ 5
Perfect when you need length.
Color: Black, Size: 15FT Flat Plug
Works great, the ports are perfect, so no more cubes.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 5, 2026
R
Verified Purchase
Rick A
Natrona Heights, US
★★★★★ 4
Nice strip, wish it had a power on indicator
Color: Black, Size: 6FT Flat Plug
My first strip was DOA, and seemed to have been returned to Amazon. I say this because I was given a replacement and the packaging was different. First it was shrink wrapped, the first device I received was not. Second, the internal packaging was different. I scrapped my original review, and this review is based upon the working strip. This is an attractive power strip with 4 USB charger ports. I like the wall mount holes on both ends that provide a more secure means of attaching the strip to something. Most chargers simply have holes on the back to hang over a screw, this one you can actually fasten to something. The position of the outlets is good for clunky older power blocks provided they aren't too wide. They don't come close to interfering with the usb ports, ensuring you can easily plug in 4 usb cords and 4 power cords without having them get tangled up. My chief dislike are the lack of any power indicator. Almost every power strip I have owned in the last 30 years had some visible way to tell the strip was turned on. The other thing is the indicator to show which side of the power switch is on. The off side has a very visible white dot, which would probably make most people believe that was the "ON" position, it is actually the off position. The on position is marked by a raised black bar(or perhaps it is a 1) which is difficult to see. I think I would have just painted the traditional "on" icon next to the power on end of the switch. Again, a power indicator here would have made all the difference.
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Reviewed in the United States on March 14, 2018
C
Verified Purchase
craig muir
Los Angeles, US
★★★★★ 5
terrific, low cost power management tool
Color: Black, Size: 6FT Flat Plug, Color: Black, Size: 6FT Flat Plug
I noticed that most of the power outlets I use on a regular basis are behind large pieces of furniture. Every modern device requires at least a little power (even if only at intervals) and many of them have to be periodically unplugged to be rebooted. This invariably leads to a bulky power strip/surge protector at every usage location. Most power strip/surge protectors are very bulky and made to sit on the floor, often in a difficult location for routine access. Unfortunately, “unplugging” from a power strip requires holding the strip firmly in place while simultaneously pulling on the plug. With the strip in a difficult location and the fact that it must be restrained to remove the plug, I typically need a scotch to even attempt it. If that weren't bad enough, most devices use an AC adapter of various different sizes, shapes and orientations. The differences are odd enough that they look like a heterogeneous collection of "rugrats". This further magnifies the problem because power strips are never devised for the space requirements of rugrats. Most power strips assume that everything is a standard 2 or 3 prong plug, lined up in military fashion. So, to make a power strip work, it must often be combined with a variety of cube taps, shifting the vertical dimensions of many outlets to accommodate the different rat dimensions. In some cases, power strips start looking like tenement slums. Power strips that attempt to accommodate the dimensions of rugrats are even bulkier and more difficult to use. The overall problem was difficult enough that I recently decided to just sacrifice the furniture. This surge protector power strip has a very low profile with two screw slots at either end. There are locations on all outlet-blocking furniture where the strips can be screw-attached (see photo). This solves nearly all the problems: (a) the strip is convenient to someone seated in the chair or laying on the bed; (b) it’s strongly secured meaning the plugs can be easily removed and replaced with one hand; (c) it has one wide-spaced outlet for the odd rugrat; and (d) it has multiple USB ports with one ‘C’ type charging port, thus eliminating one rugrat. Given all that and that fact that it’s very reasonably priced, I couldn’t be happier.
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Reviewed in the United States on September 1, 2023

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