Pistons And Sleeves - Winnebago 1987-1989 LeSharo Service Manual

ENGINE OVERHAUL AND REBUILD
CYLINDER BLOCK
&
RELATED PARTS - CLEAN
&
INSPECT
PISTONS AND SLEEVES
If these are to be reused, perform the following:
IMPORTANT
Failed or discarded parts should be inspected to
determine cause of failure.
Clean
• Pistons and sleeves with solvent and dry them
with compressed air.
• Ring grooves with a suitable tool or a piece of
an old compression ring that has been ground
to a bevel edge.
NOTE: Only the top of the piston may be cleaned
with wire brush to remove carbon
deposits. The top crown of the piston to
the edge of the wrist pin may also be
soaked with a multi-purpose household
detergent such as Mr. Clean@ or
equivalent to aid in removal of carbon
deposits. DO NOT wire brush the skirts of
the pistons under any circumstances.
• Inside surfaces of the piston and the oil drain
holes in the ring groove area. Exercise care to
avoid enlarging the holes while cleaning them.
• Cylinder liners inside and out. Remove all
carbon deposits. A wire brush may be used.
WARNING
Always wear safety eyewear when working with
compressed air.
INSPECT
• Cylinder liner for excessive out-of-round, taper,
or high spots which could cause failure of the
piston.
• Sealing areas on top and around the bottom of
the liner for wear, cracks, erosion, or any
irregular condition.
• Pistons for score marks, cracks, damaged ri ng
groove lands or indications of overheating. Any
piston that has been severely scored or
overheated must be replaced. Piston sleeves
must be replaced in matched sets. Single
piston/sleeve replacement is not acceptable.
Indications of overheating or burned spots on
the piston may be the result of an obstruction
in the connecting rod oil passage. Be sure to
check for cracks on the inside areas of the
piston.
B3-18
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