DETROIT DIESEL 53
1.2
CYLINDER HEAD
other two operate the exhaust valves. The rocker arms
The cylinder head (Fig. 1) is a one-piece casting. It may
are operated by a camshaft through cam followers and
be removed from the engine as an assembly containing
push rods.
the cam followers, cam follower guides, rocker arms,
exhaust valves and injectors. The head is securely held
Exhaust valve inserts (valve seats), pressed into the
to the top of the cylinder block with bolts.
cylinder head, permit accurate seating of the valves
under varying conditions of temperature and materially
Located in the cylinder head are the exhaust valves, a
prolong the life of the cylinder head. The inserts are
fuel injector and three rocker arms for each cylinder.
ground to very close limits and their freedom from
One rocker arm operates the injector plunger; the
Fig. 1. Cylinder Head Assembly
1970 General Motors Corp
July, 1970
SEC 1.2 Page 1
