My Account
Shopping Cart

Shopping Cart

0 items in your Cart
View Cart
Subtotal
Track
My Order

Sierra 18-0398-9 Thermostat Gasket 2-Pack for Marine Engines

Manufacturer

Picture for manufacturer Sierra

Part Number

118-0398-9
8 reviews
Sale Price

$6.68

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 18-0398-9 is a replacement thermostat gasket designed for use with Mercruiser, Volvo Penta, and OMC stern drive engines. This gasket creates a reliable seal between the thermostat housing and the engine block, preventing coolant leaks and maintaining proper engine temperature regulation.

Key Features:

  • Designed to meet or exceed OEM specifications for quality and performance
  • For use with aluminum exhaust manifolds on marine stern drives
  • Compatible with Mercury Marine 110/120 and 140/150/160 inline 6-cylinder engines
  • Fits Mercruiser MCM 3.0L/LX engines with closed cooling systems
  • Compatible with various Volvo Penta engine models including 4.3L, 5.0L, 5.7L, and 5.8L series
  • Sold as a convenient 2-pack for replacement or service needs

OEM Cross-References: Replaces Mercruiser 27-33918, 27-530451, 27-8M2021920; Volvo Penta 835417; OMC 385211, 312797; GLM 35060; Mallory 9-60009. Sierra Marine products are engineered to meet the demands of the marine environment with quality materials and precision manufacturing.

great price and selection for european automobiles

Quick and easy

good information

Very easy site to use. Pulled the exact part I was looking for.

great

This was the first time I had ordered from Boatplicity, not having come across them in my previous searches for gear. As what I was looking for was a brand name product I selected purely based on price. The purchase process went seamlessly and the two items I bought showed up within a day of each other, both well within the delivery date promised. The items were well packaged and arrived undamaged, and were exactly as I had ordered and expected.

Thanks

Very fast delivery

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