same day shipping clock icon
free shipping box icon
price tag icon

Sierra 18-0398 Thermostat Gasket Replaces 27-8M2021920

free shipping

Out of stock

List Price: $2.99
Starting At: $2.49
(You save $0.50



Sierra 18-0398 Thermostat Gasket for V6 and V8 Marine Engines

Sierra high-quality engine parts are designed to meet OEM specifications and are backed by Sierra's unmatched manufacturer's warranty. For use on Mercruiser Stern Drives, OMC Stern Drives, and Volvo Penta engines.

  • Use with aluminum exhaust manifolds
  • Fits 110/120 & 140/150/160 (I/L 6 cyl.) also MCM 3.0L/LX w/ closed cooling

Interchangeable with:

  • GLM
    • 35060
  • Mallory
    • 9-60009
  • Mercruiser Stern Drive
    • 27-33918
    • 27-8M2021920
  • OMC Stern Drive
    • 3852111
    • 312797
  • Volvo Penta
    • 835417

California Residents: warning sign WARNING Cancer and Reproductive Harm -



Other Details

Google Product Type:
Engine Parts
Product MPN:
Product UPC:

Customers Also Viewed

Sierra 18-3551  Marine Thermostat
List Price: $15.99
Starting At: $10.99

Sierra 18-3551 142 Degree Thermostat for Mercruiser, Crusader,PCM When needing to replace your thermostat, we recommend Sierra high-quality engine parts as they are designed to meet OEM...

Add to Cart
Sierra 18-2917 Thermostat Gasket Replaces 27-530451
List Price: $4.49
Starting At: $3.99

Thermostat housing gasket for Mercruiser, OMC, Volvo Gasket has brass grounding rivets Replaces: GLM - 35060 Merc - 27-33918, 27-53045-1 Mallory - 9-60007 OMC - 0312797 Volvo - 835417  

Add to Cart
Sierra 18-3677 Thermostat Kit Replaces 3853961
List Price: $28.49
Starting At: $19.99

Sierra 18-3677 Thermostat Kit for Volvo and OMC Engines Sierra high-quality engine parts are designed to meet OEM specifications.  160 Degree Thermostat Kit...

Add to Cart
Sierra 18-3649 Thermostat Replaces 8M0091470
List Price: $26.99
Starting At: $18.99

Sierra 18-3649 Thermostat Sierra 18-3649 Thermostat is a replacement part for Mercruiser Stern Drives. All Sierra engine parts are manufactured to meet or exceed OEM requirements. Temperature...

Add to Cart
Sierra 18-3668 Thermostat Kit
List Price: $19.99
Starting At: $13.99

Sierra 18-3668 Thermostat Kit for Mercruiser Stern Drives For Mercruiser engines using 142 degree thermostats Fits 1983 & newer GM V-6 & V-8 engines with standard...

Add to Cart
Sierra 18-3615 Thermostat - Raw Water
List Price: $22.49
Starting At: $16.99

Sierra 18-3615 Thermostat - Raw Water Sierra replacement thermostat for Volvo Penta engines. Temperature Rating: 150°F Interchangeable with: Volvo Penta 3587597

Add to Cart