5-27. ENGINE LOWER FRONT COVER
Dry cleaning solvent P-D-680 is toxic and flammable. Wear protective
goggles and gloves and use only in a well-ventilated area. Avoid
contact with skin, eyes, and clothes and dont breathe vapors. Do not
use near open flame or excessive heat. The flash point is 100oF-138°F
(38oC-50oC). If you become dizzy while using cleaning solvent, get
fresh air immediately and get medical aid. If contact with eyes is made,
wash your eyes with water and get medical aid immediately.
Compressed air used for cleaning purposes will not exceed 30 PSI.
Use only with effective chip guarding and personal protective
equipment (goggles/shield, gloves, etc.).
Clean front cover with dry cleaning solvent and dry with compressed air.
Inspect front cover sealing and mating surfaces for cracks, nicks, and damage that would
prevent proper sealing.
Check inside of spacer and crankshaft for burrs and nicks. Clean up burrs using crocus cloth
in circular motion.
Inspect spacer ring for nicks or burrs that would prevent proper sealing.
Inspect damper for dents, nicks, bulges or leakage in outer case. Replace damper if any of
above conditions are present.
Regardless of condition, replace damper at time of normal periodic major engine
(6) Inspect inner cone, outer cone, and damper hub for galling or burrs. Remove sight scratches
or burrs with emery cloth.
c. Repair (seal replacement)
(1) Support outer face of front cover (16)
on two wooden blocks and drive seal
(19) out of front cover. Discard seal.
(2) Clean seal bore.
if new oil seal is not precoated,
apply nonhardening sealant to outer
edge of metal casing.
(3) Position seal (19) in front cover (16)
with seal lip pointed toward inner face