Remove the fuel injection pump. (See Fuel Injection Pump Removal And Installation on Page 70-70-6.)
Remove the cylinder head, rocker arms and push rods.
(See Cylinder Head Removal And Installation on Page 70-100-1.)
Disconnect the two governor springs (Items 1 & 2) from the fork lever (Item 3) [Figure 70-100-23].
Remove the speed control plate with the governor springs [Figure 70-100-24].
Remove the start spring (Item 1) from the fork lever (Item 2) [Figure 70-100-25].
Installation: Be careful; do not drop the spring into the gearcase.
Remove the crankshaft pulley nut.
Installation: Tighten the nut to 101-116 ft.-lbs. (137-157 Nm) torque.
Use a puller and remove the crankshaft pulley [Figure 70-100-26].
Remove the bolts from the timing gearcase cover.
Installation: Tighten the bolts to 13-15 ft.-lbs. (18-20 Nm) torque.
Remove the timing gearcase cover [Figure 70-100-28].
Remove the crankshaft oil slinger (Item 1), O-ring (Item 2) and collar (Item 3) [Figure 70-100-29].
Installation: Install new O-rings and oil seal into the timing gearcase cover [Figure 70-100-30].
NOTE: When a new timing gearcase cover is installed, to establish the correct position of the injection pump fuel rack stop before removing it from the old timing gearcase cover, the distance from the machined surface of the gearcase (Gasket surface) to the end of the stop should be measured. The stop should then be installed in the new gearcase and set to the same distance that was previously measured. Do not try to test operate the engine to establish if it has enough power. The adjustment must be set by a qualified service personnel for the injection pump.