SIERRA MerCruiser Alpha Tapered Roller Bearing Assembly – 18-1165

Description

SIERRA MerCruiser Alpha Tapered Roller Bearing Assembly – 18-1165

Tapered roller bearing assembly for selected MerCruiser MC-I, R, MR and Alpha-family stern drives. It is used in the drive gear train and should be serviced with careful inspection of the mating race and gear alignment.

• Tapered roller bearing assembly
• For MerCruiser stern-drive gearcase service
• Carries radial and thrust loads
• Replace race/cup if worn or damaged
• Confirm drive serial number before ordering

For marine engine and drive parts, fitment can vary by serial number, gear ratio, casting, or prior service history. Compare the original part number and physical configuration before installation; replace related gaskets, seals, races or hardware when their condition requires it.

Specifications

• Manufacturer: Sierra
• Part Number: 18-1165
• Application: MerCruiser MC-I, R, MR, Alpha One, SS and early Alpha One Gen II gearcases, commonly through serial 0F679999.

Interchange / OEM References

• MerCruiser 31-61100A1
• GLM 21510
• Mallory 9-75117