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