Cleaning; Cylinder Head; Inspection; Valve Train Components - Navistar INTERNATIONAL DT 466 Service Manual

Cleaning

Cylinder Head

CAUTION: To prevent engine damage, leave the
valves installed within the cylinder head. This protects
the valve seats during the cleaning process.
1. Use a rotary wire brush or a sanding block with
mineral spirits to remove any deposits and gasket
material from the gasket surface of the cylinder
head.
2. Use an appropriately sized brush to clean all
mounting bolt holes in the cylinder head.
3. Wash rocker arm assemblies, hydraulic lifters,
and push rods in a suitable solvent and dry them
thoroughly. Replace any bolts that have damaged
threads.
CAUTION: To prevent engine damage, do not use
chlorinated solvents on bolts or crankcase tapped
holes. Parts should be clean, dry, and free of any
chemical residuals other than engine oil.

Inspection

Valve Train Components

Engine valve train load carrying requirements have
resulted in the release of several different push rod
and tappet configurations. The main differences are
improved geometry designs and materials.
For information on push rod and tappet compatibility
for different engine model year configurations, see
(TSI-06-12-14 Update Valve Train Components –
Push Rod and Tappet Compatibility, page469 ) .

Push Rods

WARNING: To prevent personal injury or
death, wear safety glasses with side shields.
Limit compressed air pressure to 207 kPa (30 psi).
1. Thoroughly clean each push rod using a suitable
solvent and dry rods using filtered compressed air
.
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
CYLINDER HEAD AND VALVE TRAIN
EGES-265-2
Follow all warnings, cautions, and notes.
© 2009 Navistar, Inc.
2. Inspect each push rod for wear at both ends. If
push rod is worn, install new push rod.
Figure 148 Check push rods for straightness
3. Check all push rods for straightness by rolling
push rods on a flat surface with the cap end over
the edge of the flat surface.
4. Measure push rod runout with a feeler gauge
(page156 ) between the flat surface and push rod.
5. If specifications (page 154 ) are exceeded, install
new push rod.

Rocker Shaft

CAUTION: To prevent engine damage, if it is
necessary to replace the rocker shaft, all of the
rocker arms must be replaced. Reusing rocker arms
on a new shaft will not allow for an adequate break-in
period, causing premature failure of the rocker arm
assembly.
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