My Account
Shopping Cart

Shopping Cart

0 items in your Cart
View Cart
Subtotal
Track
My Order

Sierra 18-3617 Marine Thermostat Kit for Volvo Penta 8.1L Engines

Manufacturer

Picture for manufacturer Sierra

Part Number

18-3617
10 reviews
Sale Price

$47.91

3 left at this price

delivery box

Usually delivered within 2 days

Check out with

ApplePay
Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Sierra 18-3617 is a complete marine thermostat and gasket kit engineered as a direct replacement for Volvo Penta 8.1L raw water cooled engines (2000 and newer). Designed to meet or exceed OEM specifications, this kit restores proper engine temperature regulation and cooling system performance right out of the box.

A faulty thermostat can cause an engine to run outside its optimum temperature range, leading to overheating, poor fuel economy, or accelerated wear. Common warning signs include temperature gauge fluctuations, coolant leaks near the thermostat housing, or the engine running consistently too hot or too cold. Replacing the thermostat kit with a quality Sierra unit ensures reliable, accurate temperature control.

Kit Contents:

  • Thermostat
  • Thermostat gasket

Replaces OEM Part Numbers:

  • Volvo Penta: 986506
  • Volvo Penta: 3853983

Key Features:

  • Manufactured to meet or exceed Volvo Penta OEM specifications
  • Complete kit for a hassle-free, single-purchase installation
  • Direct-fit replacement — no modifications required
  • Restores cooling system performance to factory standards

UPC: 808282270575

Simple

Good

It has been interesting not very many parts for 1970 VW bug

very good prices. good service.I am a future customer.thanks.

Ordered Weathertech floor liner for wife's truck. Best price and quick delivery. Will order from Autoplicity.com again.<br><br>Happy New Year

Easy to use site with the items I wanted!

cheapest price

Best price on a holley carburetor online. I unusually use summit but even the shipping price is less, no handling fees either. I am hearing great things about the shipping so I am hopeful the 69 javelin is back on the road this week! If it works out I will tell all my motor head friends about this site!

At first I did not expect Autoplicity to even carry this part, but in fact they did. Placed the order and I received the part quickly. They were the cheapest for the part after searching nearly everywhere. Will order from them again.<br>Order #8334

great price $60.00 less than summit will shop here again!

Share icon
Return Policy
Returns are easy at Boatplicity

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy