Checking Intake and Exhaust Valve Timing

4-24. Checking Intake and Exhaust Valve

Timing

a. G e n e r a l . V a l v e t i m i n g i s c h e c k e d w i t h

c y l i n d e r No. 6R and 6L intake valve clearance

s e t at 0.100 inch. The flywheel is stamped (fig.

4-190) with timing marks "6R INT CLOSE

0 . 1 0 0 C L R " for timing the right camshaft

with the crankshaft, and is also marked with

timing marks "6L INT CLOSE 0.100 CLR" for

timing left. For instructional purposes the timing

of the right camshaft is described. Right and left

c a m s h a f t timing is identical. Refer to Table 4-9

f o r instructions pertinent to this operation.

Note. Before checking or adjusting exhaust

valve clearance (fig. 4-188) and intake valve

clearance (fig. 4-189), make sure both valves are

closed on cylinder being checked. Turn engine as

shown in figure 4-51 until valves are closed and

camshaft lobes are in position shown in figure 4-

73.

1. Loosen exhaust valve adjusting screw lock nut (A).

2. Turn valve adjusting screw (B) until clearance be-

tween screw pad and valve stem is 0.025 inch. Torque

lock nut to 175 pounds inch after correct adjustment is

m a d e . Make certain setting has not changed after

tightening lock nut.

Figure 4-188. Setting exhaust valve clearance

using thickness gage blade-5210-793-7899.

Figure 4-190. Flywheel timing mark locations.

1. Loosen intake valve adjusting screw lock nut (A).

2. Turn valve adjusting screw (B) until clearance be-

tween screw pad and valve stem is 0.010 inch. Torque

lock nut to 175 pounds inch after correct adjustment is

made.

Figure 4-189. Setting intake valve clearance

using thickness gage blade-5210-793-7898.

4-98