TK 61555-2-MM-EN
63
Figure 37.
Top Dead Center One and Four
1.
Index Mark
2.
Top Dead Center Mark for 1 and 4
b.
Check the rocker arms on the number one cylinder to see if they are loose.
c.
If the rocker arms are loose, the engine is at top dead center of the compression stroke for
the number one cylinder.
d.
If the rocker arms are tight, the engine is at top dead center of the exhaust stroke for the
number one cylinder. Rotate the engine 360 degrees to place the engine at top dead
center of the compression stroke for the number one cylinder.
4.
Use a feeler gauge to check the valve clearance on both valves for the number one cylinder,
the intake valve for the number two cylinder, and the exhaust valve for the number three
cylinder. The valve clearance for both the intake valve and the exhaust valve should be 0.15 to
0.25 mm (0.006 to 0.010 in.).
a.
Check to verify that the valve stem cap is in good condition and is positioned squarely on
the top of the valve stem. Replace the valve stem cap if it shows significant wear.
5.
Adjust the valves if necessary by loosening the locknut and turning the adjustment screw
until the valve clearance is correct.
Figure 38.
Adjusting the Valve Clearance
6.
Hold the adjustment screw in place and tighten the locknut.
7.
Recheck the valve clearance.
8.
Rotate the engine one full turn (360 degrees) in the normal direction of rotation (clockwise
viewed from the water pump end), and align the 1-4 timing mark on the flywheel with the
index mark in the timing mark access hole. This is top dead center of the compression stroke
for the number four cylinder.
