Engines and Components› Engine Covers, Pans and Dress-Up Components

SIERRAMARINE

THERMOSTAT COVER GASKET

$16.57

SKU: S08C 18-2555

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Special Order
Ships in 4–6 weeks
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Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Easy — 1–2 hours

Description

The Sierra 18-2555 is a thermostat cover gasket for marine engines. It is made in the United States and is a direct replacement for MerCruiser part numbers 27-89656 and 27-896561, as well as GLM 32100. This gasket is designed to fit MCM 3.7L engines.

Fitment

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Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

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Specifications

BrandSIERRAMARINE
Part NumberS08C 18-2555

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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