9-11
Crankshaft Oil Seal
Press a new crankshaft oil seal into the main bear-
ing cover to a depth of 0.020 to 0.060 inches (0.5 to
1.5 mm) below the surface.
CAUTION
Pressing the oil seal in too far will re-
sult in an oil leak.
If the crankshaft has been grooved or has nicks or
scratches where the oil seal touches the crankshaft,
it is recommended that a “Speedi-Sleeve” be
installed. See PSB 686 for “Speedi-Sleeve”use and
installation instructions.
Main Bearing Cover
Install a seal guide over the crankshaft to protect the
crankshaft oil seal. On Models HGJAB, HGJAC,
HGJAE and HGJAF make sure the governor gear
(Page 10-1) has been installed.
Use a new cover gasket and 3-Bond or an RTV
adhesive sealant equivalent to Dow Corning 732.
Make sure both O-rings (187-6239) are in place,
one at each oil return hole from the block.
Lubricate the oil seal lip and gently guide the cover
on over the crankshaft to prevent damaging the oil
seal, making sure that the governor gear meshes
with the camshaft gear. If necessary, poke a thin rod
through the gap between crankcase and cover to
turn the governor gear slightly so that the teeth
mesh.
Torque the cover screws to 16.2-16.9 lb-ft
(22-23 N-m).
Note: Replace all cover screws that are not im-
printed with the number “9” with Onan Part
Number 800-6361. These are newer, stronger
screws necessary for securing the cover tighter
to prevent oil leaks.
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