Yanmar 3YM30 Sevice Manual page 109

(13) Mounting the oil seal and gear case cover
1) Replace the used oil seal with a new one when the
gear case cover is disassembled.
2) Insert a new oil seal by using the oil seal insertion
tool on the position of the gear case cover end face
(65 0/-1 mm distance from the end of the cylinder
block). (Refer to the right figure.)
3) Apply lithium grease to the oil seal lips.
4) When wear is found on the oil seal contact part of a
crankshaft pulley, replace the pulley with a new
one. Carefully install the pulley so as not to
damage the oil seal.
5) Apply the liquid gasket to the gear case cover.
Position the two knock pins and tighten the bolts of
the gear case cover.
NOTE:
Trim the liquid gasket if it protrudes onto the oil pan
mounting surface.
(14) Mounting the lube oil inlet pipe
Mount the lube oil inlet pipe on the bottom of the
cylinder block, using new gasket.
Tightening torque
Lube oil inlet pipe
Crankshaft
pulley
N•m (kgf•m)
26 (2.6)
94
4. Disassembly and reassembly
Oil seal Gear case cover
Liquid gasket
0
61.5
-1
Cylinder block
Gear case
Gear case cover
Oil seal