87
CYLINDER COVER, OIL SEAL, AND BEARING SERVICE
Cylinder Cover
The following procedures, except oil seal replacement, require engine disassembly. See "Disassembly Procedure" in
this chapter.
Clean and inspect the cover, look for wear and scoring of the bearing surfaces. Measure the bearing surface diameters
using a micrometer and check the specifications for worn or damaged parts. Replace as necessary.
When reinstalling the cover, apply a drop of Loctite 242 to the cover screw threads and re-torque to the recommended
specification. Always use new oil seals and gaskets after disassembly.
50
Late production top mounted breathers use the rubber boot
and breather tube as a push in design. Mark or note the
location of the breather tube. Use a large flat blade
screwdriver to pry the boot up and lift the breather assembly
out. Be careful not to drop the breather body out of the
rubber boot when removing (diag. 50).
A new breather tube boot is recommended for replacement
to assure proper crankcase seal. Apply engine oil to the
breather tube boot and push the breather in until the top
shoulder of the boot contacts the crankcase.
Side Mounted Breather
This type of breather mounts over the valve compartment
and uses a reed style check valve. Most horizontal shaft
engines use this style of breather. The filter element is
held in place by a small barb in the cover. To remove the
filter, insert a knife blade between the filter element and
the barb, and depress the filter element (diag. 51).
Some engine models have two gaskets installed next to
the cylinder block. If two gaskets were originally installed,
replace them using two gaskets (diag. 52).
Integral Breather
Some ECV engines are equipped with breathers that are
part of the cylinder block. Venting is accomplished through
passages drilled in the block to route the air flow to the
outside (diag. 53).
WELCH
PLUG
BAFFLE
COVER
GASKET
BODY
REED
DRAIN
HOLE
BODY
FILTER
GASKET
COVER
TUBE
53
ONE WAY
DISC VALVE
IDENTIFICATION
PLATE
RETURN
HOLE
GASKET
ONE WAY
DISC VALVE
COVER PLATE
COVER
GASKET
BAFFLE
RETURN HOLE
51 52
GASKET
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