Thermo King SB-III 30 SR+, Manual

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Engine Maintenance (Rev. 04/02)
49
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 num-
ber one cylinder.
1. Index Mark
2. Top Dead Center Mark for 1 and 4
Top Dead Center One and Four
aea701
1
2
Front Rear
Cylinder No. 1 2 3 4
Valve arrangement E I E I E I E I
Piston in No. 1 cylinder is at
TDC on compression stroke
Piston in No. 4 cylinder is at
TDC on compression stroke
Valve Adjustments and Cylinder Configurations
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° to place the
engine at top dead center of the compression stroke
for the number one cylinder.
5. Check the valve clearance of both valves for the num-
ber one cylinder with a feeler gauge. The valve clear-
ance for both the intake valve and the exhaust valve
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.
6. Adjust the valves if necessary by loosening the lock nut
and turning the adjustment screw until the valve clear-
ance is correct.