EPA07/10 DD PLATFORM WORKSHOP MANUAL - ENGINE
14.1 DESCRIPTION AND OPERATION OF CYLINDER HEAD AND RELATED
PARTS
This section explains the description(s) and operation(s) of the following systems within the
cylinder head:
□
Cylinder Head
□
Valve Springs and related components
□
Intake and Exhaust Valves
14.1.1
Cylinder Head
The cylinder head has been designed with a compacted graphic iron material. There are two
intake and two exhaust valves per cylinder. To ensure the correct bolts are used when installing
the cylinder head, the bolt thread size 16 is stamped on the head of the bolt. All bolts must
be tightened in the correct sequence. The valve train assembly needs to be removed in order
to access the cylinder head bolts.
The cylinder head has a split coolant jacket; the coolant
fl
ows around the cylinder to the inlet
side of the head and then to the exhaust side. The coolant
fl
ows in the lower level of the cylinder
head around the injectors and the valve seat rings. The coolant then
fl
ows around in the upper
level of the cylinder head and cools the valve guides. The advantage of this design is a very even
and highly effective cooling system.
1. Oil Return Openings or Oil Return Holes From
Cylinder Head to Cylinder Block
2. Oil Transfer Holes from Cylinder Block to Cylinder
Head
Figure 14-1
Oil Hole Location on Fire Deck of Cylinder Head
All information subject to change without notice.
DDC-SVC-MAN-0081 2010
Copyright © 2010 DETROIT DIESEL CORPORATION
14-3
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