Exterior Components› Body Panels and Components

SIERRAMARINE

SEAL KIT GEAR HOUSING

$78.13

SKU: S08C 18-74527

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping
Non-Returnable Item

Description

The SIERRAMARINE 18-74527 is a lower unit gasket kit designed for Yamaha F9.9 outboard engines manufactured between 1997 and 2005. This replacement part ensures a proper seal for your boat engine's lower unit, preventing oil leaks and maintaining engine function.

The gasket kit is constructed with materials that offer resistance to hydrocarbons and high temperatures, providing durable sealing and protection against corrosion. Regular replacement of lower unit gaskets is essential for preserving the performance and longevity of your outboard motor.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

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

Available on iOS & Android

Specifications

BrandSIERRAMARINE
Part NumberS08C 18-74527

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.

View Full Return Policy