In reassembly; be sure oil groove in shaft is facing up.
Drive shaft into crankcase with soft metal hammer and
Disconnect the governor linkage and remove governor
maintain a .003 to .004 inch clearance between idler
housing and gear-flyweight assembly from shaft in gear
gear and shoulder of shaft. Lock shaft in place with the
cover. Take out the ten gear cover capscrews and drive
Allen set screw.
out the two dowel pins as shown in Fig. 14. The cover
can then be taken off exposing the gear train as
illustrated in Fig. 15.
The engine can now be inverted so that the supports
and oil pan can be removed, see Fig. 17.
In reassembly; tighten oil pan mounting screws, 6 to
OIL PUMP (Fig. 18)
Remove locknut and driver gear from shaft. If gear is
too tight to remove by hand, use a puller, hammering
on end of shaft to loosen gear will damage pump.
Take out slotted pipe plug from bottom of crankcase.
By means of a 5/32 inch Allen wrench, remove
lockscrew from pipe plughole. Withdraw oil pump from
inside crankcase. If pump fits too tight to remove by
hand, tap front of pump housing (not shaft), with
hammer and brass rod.
PISTONS and CONNECTING RODS (Figs. 19, 20,
By means of a 1/2" socket wrench, loosen and remove
In reassembly; inspect crankshaft oil seal and replace if
the hex locknuts from connecting rod bolts. Then, by
necessary. Be sure that oil sling is in place on
tapping the ends of the bolts lightly, the connecting rod
crankshaft, then mount gear cover using a new flange
cap will break free from the bolts.
gasket. Tap the two dowel pins in place and mount
capscrews. Tighten screws 14 to 18 ft. lbs. torque.
Scrape off all carbon deposits that might interfere with
removal of pistons from upper end of cylinder. Turn
If it is necessary that the camshaft gear be removed,
first pry oil sling off crankshaft, and remove thrust
plunger and spring from end of camshaft. Take out the
from camshaft using a screw driver or similar wedge
The camshaft gear has offset mounting holes to
provide accurate assembly for valve timing. The gear
can only be put on the correct way for matching up the
timing mark with that of the crankshaft gear. See Fig.
IDLER GEAR AND SHAFT
A tapped hole in the side of the crankcase contains a
setscrew for locking idler shaft in place. See Fig. 16.
Remove screw with a 5/32" Allen wrench. Disassemble
shaft and gear from case by means of the 3/8"-16
tapped puller hole in end of idler shaft.