POWERHEAD
Page 4-22 90-826883R2 JUNE 1998
Powerhead Cleaning and Inspection
Cylinder Block and Crankcase Cover
IMPORTANT: Crankcase cover and cylinder block are a matched, line-bored as-
sembly and must be replaced as a set.
1. Thoroughly clean cylinder block and crankcase cover with Quicksilver Power Tune
Engine Cleaner (91-92-15104A12). Verify that all sealant and old gaskets are re-
moved from mating surfaces. Remove all carbon deposits from exhaust ports, de-
compression ports and cylinder dome.
2. Inspect cylinder block and crankcase cover for cracks or fractures.
3. Check gasket surfaces for nicks, deep grooves, cracks and distortion.
4. Inspectallwaterandfuelpassagesincylinderblockandcrankcasecoverforobstruc-
tions.
5. Verify that all fittings and plugs are tight. If the center main bearing alignment pin is
loose, cylinder block and crankcase cover must be replaced.
57125
a
a - Alignment Pin
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