DETROIT DIESEL 53
EXHAUST VALVE CLEARANCE ADJUSTMENT
The correct exhaust valve clearance at normal engine
Whenever the cylinder head is overhauled, the exhaust
valves are reconditioned or replaced, or the valve
operating temperature is important for smooth, efficient
operating mechanism is replaced or disturbed in any
operation of the engine.
way, the valve clearance must first be adjusted to the
cold setting to allow for normal expansion of the engine
Insufficient valve clearance can result in loss of
parts during the engine warmup period. This will ensure
compression, misfiring cylinders and, eventually, burned
a valve setting which is close enough to the specified
valve seats and valve seat inserts. Excessive valve
clearance to prevent damage to the valves when the
clearance will result in noisy operation, especially in the
engine is started.
low speed range.
ENGINES WITH FOUR VALVE CYLINDER HEADS
All of the exhaust valves may be adjusted, in firing order
Refer to the General Specifications at the front of the
sequence, during one full revolution of the crankshaft.
manual for the engine firing order.
1972 General Motors Corp.
SEC. 14.1 Page 1