Cylinder Cover, Oil Seal, And Bearing Service - Tecumseh ECV100-120 - TECHNICIAN S Handbook

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. 47).
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. 48).
Some engine models have two gaskets installed next to
the cylinder block. If two gaskets were originally installed,
replace them using two gaskets (diag. 49).
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. 50).

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.
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