4-CYCLE OVERHEAD VALVE ENGINES - Small Engine Discount
4-CYCLE OVERHEAD VALVE ENGINES - Small Engine Discount
4-CYCLE OVERHEAD VALVE ENGINES - Small Engine Discount
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CYLINDER COVER, OIL SEAL, AND BEARING SERVICE<br />
The following procedures, except oil seal replacement, require the engine to be disassembled. See "<strong>Engine</strong><br />
Disassembly Procedure" in this chapter.<br />
Cylinder Cover<br />
Clean and inspect the cover, looking for wear and scoring of the bearing surfaces. Measure the bearing surface<br />
diameters using a micrometer and check the specifications for worn or damaged parts. Replace as necessary.<br />
When reinstalling the cover, apply a drop of Loctite 242 to the cover screw threads and torque the cover screws<br />
to the recommended specification. Always use new gaskets and new oil seals installed using seal protectors<br />
after the cover is removed.<br />
Oil Seal Service<br />
NOTE: BEFORE REMOVING THE OIL SEAL,<br />
CHECK TO SEE IF THE SEAL IS RAISED OR<br />
RECESSED. WHEN INSTALLING A NEW OIL SEAL,<br />
TAP IT INTO POSITION GENTLY UNTIL IT IS<br />
SEATED INTO ITS BOSS. SOME SEALS ARE NOT<br />
POSITIONED FLUSH TO THE CYLINDER COVER.<br />
ATTEMPTING TO INSTALL THE SEAL TOO FAR IN<br />
CAN CAUSE DAMAGE TO THE OIL SEAL AND<br />
ENGINE.<br />
If the crankshaft is removed from the engine, remove<br />
the old oil seals by tapping them out with a screwdriver<br />
or punch from the inside. If the crankshaft is in place,<br />
remove the seal by using the proper oil seal puller<br />
(diag. 50).<br />
Select the proper seal protector and driver from the<br />
tool list in Chapter 11 to install a new oil seal. Place<br />
the oil seal over the protector and place it over the<br />
crankshaft. Drive the seal into position using the<br />
universal driver part no. 670272. The seal protector<br />
will insure that the seal is driven in to the proper depth<br />
(diag. 51).<br />
OIL SEAL REMOVER<br />
TOOL: POSITIONED FOR<br />
REMOVAL OF OIL SEAL<br />
OIL SEAL<br />
OIL SEAL<br />
OIL SEAL<br />
DRIVER 670272<br />
OIL SEAL<br />
DRIVER<br />
PROTECTOR<br />
50<br />
CRANKSHAFT BEARING SERVICE<br />
Ball Bearing Service<br />
Remove the two bearing retainer screws and washers.<br />
Remove the ball bearing in the cylinder cover by<br />
pressing the bearing from the outside of the cover<br />
toward the inside using an arbor press.<br />
Install a new ball bearing by pressing the bearing from<br />
the inside of the cover toward the outside until the<br />
bearing contacts the shoulder. Install the two bearing<br />
retainer screws with washers and tighten to 45 in. lbs.<br />
(5.0 Nm) of torque.<br />
SNAP RING<br />
51<br />
OIL SEAL REMOVED<br />
52<br />
Not For Resale<br />
www.<strong>Small</strong><strong>Engine</strong><strong>Discount</strong>.com<br />
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