Assembly - Gravely Convertible 10 Shop Manual

Figure 31 Camshaft And Valve Mechanism
RING GEAR (C-10A and C-12)
If inspection of the ring gear reveals broken, excessively worn or otherwise damaged teeth, the ring
gear must be replaced. The ring gear is press fitted into a recess on the outer perimeter of the flywheel. The
flywheel must be off the engine for ring gear replacement.
Several methods may be used to remove the damaged ring gear. One method is to break the gear with a
cold chisel and/or a hack saw. Another way is to heat the ring gear with a torch, then drive the gear off the
flywheel. If the latter method is used, the flywheel will also absorb some heat and it must be allowed to
cool before the new ring gear can be installed.
The new gear must be expanded with heat before installation. This can be done by submerging the gear
in hot oil or heating in oven to about 400 to 450°F. Position the heated gear on the flywheel, then after
making sure it is not cocked, either press the gear on with an arbor press or drive it on with a soft-head
hammer. As the gear cools, it will contract to form a tight press fit on the flywheel. Be sure to tighten the
flywheel retaining nut to the proper torque value after reinstalling the flywheel on the engine.
1. Rear Main Bearing
a.
Install rear main bearing by pressing it into cylinder block with shielded side facing to inside of
block.
2. Governor Shaft
a.
Most engines have a cross shaft with an extension riveted in place to line up with governor gear.
A needle bearing is provided (in block) to hold cross shaft in alignment.
3. To Install Governor
a. Place cylinder block on its side. Slide governor shaft into place from inside of block.
b.
The governor shaft can be adjusted for end clearance by moving needle bearing in block. Set
bearing to allow a slight back-and-forth movement of the shaft.
c.
Place space washer on stub shaft and slide governor gear assembly into place.
Figure 32 Valve - Tappet Clearance

ASSEMBLY

(all models)
37