CYLINDER HEAD AND VALVE TRAIN 117
Description
The DT 466 and DT 570 cylinder heads are cast iron
and feature four valves per cylinder.
The design of the cylinder head valve train focuses
on component commonality between the intake
and exhaust sides of the head. Shared parts
include: valve bridges, guides, springs, retainer
keys, rotators, and valve stem seals. These parts
are also compatible between the 466 and 570 engine
families.
The valve rotators create positive valve rotation for
increased valve face life.
The valve stem seals are one piece design, easy to
install, and have a hardened washer for valve spring
seating.
The valve guides and valve seats are replaceable.
Thebridgecanbeinstalledontheintakeorexhaust
in either direction, and still allow compression brake
operation through the pad on top.
A single roller tappet transfers lifting forces through
a push rod, rocker arm, and then onto a valve
bridge where both valves are opened and closed
simultaneously. This allows for a greater quantity of
air to flow through the engine than comparably sized
engines using only two valves per cylinder.
Phosphate coating has been carried over from past
production to rocker arms for initial break-in and to
extend life.
Pressurized oil is fed from the crankcase through the
head at cylinder number 6 exhaust lower support. Oil
then enters shaft and is distributed to all rocker arms.
EGES-265-2
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Follow all warnings, cautions, and notes.
© 2009 Navistar, Inc.
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