Mercury 65-115 HP Basic Gearcase Housing 8M0091538

Mercury Basic Gearcase Housing 8M0091538 is a genuine Mercury OEM replacement housing for select 65-115 HP EFI FourStroke outboards equipped with a standard-rotation gearcase. It serves as the main housing for the internal gears, shafts, bearings, seals, and other lower-unit components.

Compatible with select applications including:

• Mercury 65 Jet
• Mercury 75 HP FourStroke
• Mercury 80 HP FourStroke
• Mercury 80 Jet
• Mercury 90 HP FourStroke
• Mercury 100 HP FourStroke
• Mercury 115 HP FourStroke
• Mercury 115 Pro XS FourStroke
• 2.07:1 standard-rotation gearcase configurations

Parts breakdowns show 8M0091538 used with both Long complete gearcase 8M0088072 and X-Long complete gearcase 8M0088074. It is also listed in the 2.07:1 standard-rotation gearcase used across this engine family.

This is the basic gearcase housing, not a complete lower unit. The gears, propeller shaft, driveshaft, bearings, seals, water pump components, and related internal hardware are serviced separately.

This housing should also be distinguished from the SeaPro basic housing 8M0099907 and the silver standard housing used on certain Pro XS applications.

To Confirm Compatibility: Contact our team with your engine serial number at (727) 596-5929 before ordering.