Crankcase Cover

Clutch Covers for Motorcycle and ATV Engines

A cracked clutch cover can need replacement even when the clutch still works. The cover is the outer engine housing around the clutch area, not its friction plates or pressure plate. It closes an opening in the crankcase and, on designs where it retains lubricant, a damaged housing can let oil escape.

The bolt pattern, depth, and shaft openings of an engine clutch cover follow the engine's construction. A protective cover fitted over an existing housing serves a different purpose and cannot replace a damaged housing underneath it.

Scratches, Cracks, and Damage Beneath the Cover

A surface scrape and a crack through the housing call for different decisions. Look for fluid escaping from the damaged area, displaced metal, and distortion near the mounting edge. Deep impact damage may also affect parts behind the cover, which need inspection before the engine is run again.

Damaged crankcase threads or a distorted mating surface need repair before a new cover can seat correctly. When assessing a leak, distinguish fluid coming through the casting from fluid appearing along the joint; the visible wet area may be below the actual source.

Sealing Surfaces and Clutch Cover Openings

The perimeter joint must close evenly. Locating dowels, bolt positions, and the cover's shape work together to position the housing; tightening harder cannot correct a misaligned cover. Shaft seals and openings, where present, are separate from the perimeter gasket and can require their own attention.

Build the parts list around the engine's sealing arrangement and the stated package contents, including any separately supplied gaskets, seals, and fasteners. For a right crankcase cover, internal clearance and shaft openings help identify the correct housing alongside its mounting pattern.

Frequently Asked Questions