Dodge ram truck 3500 1996 Service Manual page 1144

I - 154 8.DL ENGINE
CLEANING AND INSPECTION (Continued)
specifications are 0.0007 mm/mm (0.0004 inch/inch),
0.127 mm/152 mm (0.005 inch/6 inches) any direction
or 0.254 mm (0.010 inch) overall across head. I f
exceeded, either replace head or lightly machine the
head surface.
The cylinder head surface finish should be
1.78-4.57 microns (15-80 mlcroinches).
inspect push rods. Replace worn or bent rods. >
Inspect rocker arms. Replace i f worn or scored.
OIL PAN
CLEANING
Clean the block and pan gasket surfaces.
If present, trim excess sealant from inside the
engine.
Clean oil pan In solvent and wipe dry with a clean
cloth.
Clean oil screen and pipe thoroughly In clean sol­
vent. Inspect condition of screen.
INSPECTION
Inspect oil drain plug and plug hole for stripped or
damaged threads. Repair as necessary.
Inspect oil pan mounting flange for bends or distor­
tion. Straighten flange, i f necessary.
OIL P U i P
CLEANING
Wash all parts In a suitable solvent and inspect
carefully for damage or wear.
INSPECTION
Mating surface of the oil pump cover should be
smooth. Replace pump cover i f scratched or grooved.
Lay a straightedge across the pump cover surface
(Fig. 63). I f a 0.076 mm (0.003 inch) feeler gauge can
be inserted between cover and straightedge, cover
should be replaced.
>-68
Fig. 68 Checking Oii Pump Cower Flatness
Measure thickness (Fig. 64) (Fig. 65)and diameter
of rotors. I f either rotor thickness measures 14.956
mm (0.5876 Inch) or less, or i f the diameter is 82.45
mm (3.246 inches) or less, replace rotor set.
Fig. 64 Measuring Outer Rotor Thickness
9309-70
Fig. 65 Measuring Inner Rotor Thickness
Slide outer rotor into timing chain cover pump
body. Press rotor to the side with your fingers and
measure clearance between rotor and pump body
(Fig. 66). I f clearance is 0.19 mm (0.007 inch) or
more, and outer rotor is within specifications, replace
timing chain cover.
Install inner rotor into timing chain cover pump
body (Fig. 67). Inner rotor should be positioned with
chamfer up or toward engine when cover is installed.
This allows easy installation over crankshaft. I f
clearance between inner and outer rotors is 0.150
mm (0.006 inch) or more, replace both rotors.
Place a straightedge across the face of the timing
chain cover pump body, between bolt holes (Fig. 68).
I f a feeler gauge of 0.077 mm (0.003 inch) or more
can be inserted between rotors and the straightedge,