Cleaning And Inspection; Cylinder Block And Crankcase Cover - Mercury 150 EFI Service Manual

POWERHEAD

Cleaning and Inspection

Cylinder Block and Crankcase Cover

IMPORTANT: Crankcase cover and cylinder block is a matched, line-bored assembly
and should never be mismatched by using a different crankcase cover or cylinder
block.
If crankcase cover or cylinder block is to be submerged in a very strong cleaning
solution, it will be necessary to remove the crankcase cover/cylinder block bleed
system from crankcase cover/cylinder block to prevent damage to hoses and check
valves.
1. Thoroughly clean cylinder block and crankcase cover. Be sure that all sealant and old
gaskets are removed from matching surfaces. Be sure that carbon deposits are re-
moved from exhaust ports.
2. Inspect cylinder block and crankcase cover for cracks or fractures.
3. Check gasket surfaces for nicks, deep grooves, cracks and distortion that could cause
compression leakages.
4. Check all water and oil passages in cylinder block and crankcase cover to be sure that
they are not obstructed and that plugs are in place and tight.
Page 4A-66
CAUTION
90-883728 JULY 2001