Cleaning And Inspection; Exhaust Manifold; Intake Manifold - Navistar INTERNATIONAL DT 466 Service Manual

Figure 74 Intake manifold mounting bolts
5. Remove 13 intake manifold mounting bolts (M10
x 35).
6. Remove intake manifold and gasket from the
engine. Discard gasket.

Cleaning and Inspection

Exhaust Manifold

1. Clean exhaust manifold thoroughly with a suitable
non-caustic solvent. Scrape off excess scale and
rust from manifold surfaces.
WARNING: To prevent personal injury or
death, wear safety glasses with side shields.
Limit compressed air pressure to 207 kPa (30 psi).
2. After cleaning, blow dry exhaust manifold using
filtered compressed air.
3. Inspect manifold for cracks or damage. Replace
manifold as necessary.
4. Check for warpage as follows:
a. Install exhaust manifold without the gasket
to a cleaned cylinder head mating surface.
Torque 12 mounting bolts (M12 x 35) to the
special torque value (Table 8).
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
INTAKE, INLET, AND EXHAUST MANIFOLDS
EGES-265-2
Follow all warnings, cautions, and notes.
© 2009 Navistar, Inc.
Figure 75 Checking exhaust manifold for cracks
and warpage
b. Use a 0.25 mm (0.010 in) feeler gauge
to measure the gap between the mating
surfaces of the manifold and engine. If the
feeler gauge passes through the gap, the
manifold must be resurfaced.
NOTE: A maximum of 0.64 mm (0.025 in) of
material can be ground off to correct warpage.
c. Remove 12 bolts (M12 x 35) and manifold.
d. If the warpage cannot be corrected by
grinding manifold mating surface, replace
manifold.

Intake Manifold

CAUTION: To prevent engine damage, do not attempt
to grind or machine the intake manifold to compensate
for a warped condition.
1. Clean intake manifold thoroughly with a suitable
non-caustic solvent.
WARNING: To prevent personal injury or
death, wear safety glasses with side shields.
Limit compressed air pressure to 207 kPa (30 psi).
2. After cleaning, blow dry using filtered compressed
air.
3. Check manifold for cracks and damage. Replace
intake manifold as necessary.
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