Thermo King T-500R Maintenance Manual page 168

b. Check the rocker arms on the number 1 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 1 cylinder.
d. If the rocker arms are tight, the engine is at top dead center of the exhaust stroke for the number 1 cylinder. Rotate the
engine 360 degrees to place the engine at top dead center of the compression stroke for the number 1 cylinder.
3. Use a feeler gauge to check the valve clearance on both valves for the number 1 cylinder. The valve clearance for both the
intake valves and the exhaust valves should be 0.006 to 0.010 in. (0.15 to 0.25 mm).
NOTE: Check to make sure 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.
4. Adjust the valves if necessary by loosening the lock nut and turning the adjustment screw until the valve clearance is correct.
5. Hold the adjustment screw in place and tighten the lock nut.
6. Recheck the valve clearance.
7. Place the engine at top dead center of the compression stroke for the number 3 cylinder. (Not applicable for 2 cylinder
Engine)
1
1. Top Dead Center Timing Mark for Number 1
Cylinder
2. Index Timing Mark on Starter Mounting Plate
Timing Marks
1. Adjustment Screw
2. Lock Nut
Valve Clearance
Adjusting Valves
Engine Maintenance
2
AGA148
AGA114
1
2
9-30