Dodge ram truck 3500 1996 Service Manual page 1194

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5.9L (DIESEL) ENGINE
B R
CLEANING AND INSPECTION (Continued)
Measure the valve guide bore (Fig, 121). The bore
diameter should be 3.019-8.089 mm (0.3157-0.3185
inch).
NEW DIAMETER LIMITS
8.019-8.029 mm (0.3157-0.3165 inch)
W O R N LIMIT
8.090 mm (0.3185 inch)
J9109-135
Fig. 121 Valve Guide Bore
I f the valve guide bores are larger than the worn
limit, the cylinder head must be machined for service
valve guides. New valve guides must be reamed to
size after they are Installed.
If the cylinder head needs service valve guides and
valve seat inserts, the valve guides should be
installed first.
% /ALVE
SPRINGS
INSPECTION
Measure the valve spring length. The approximate
free length is 60 mm (2.36 Inch) with the maximum
inclination of 1.0 mm (0.039 inch).
Measure the valve spring force. 359 N (81 lbs.) is
the minimum acceptable load required to compress
the spring to a height of 49.25 mm (1.94 inch).
If the valve spring does not meet the limits above,
replace the spring.
VALVE SEATS
INSPECTION
Cylinder head with Integral valve seats can be
ground only once. Previously ground integral seats
must be replaced with service seats.
One X stamped into the head casting identify seats
that have been ground previously (Fig. 122).
Two X's stamped on the head indicate service seats
have been installed (Fig. 122). Service seats can be
ground.
Fig, 122 Reworked Cylinder Head Seats—Stamped
identification
On the integral seat head, i f 0.254 mm (0.010 Inch)
or more has been removed from the head combustion
surface, service seats must be installed.
To determine i f the head has been previously
resurfaced, before calculating valve depth, process as
follows:
(1) Check the rear lower right corner of the head
for a stamping that would indicate previous resurfac­
ing (.003).
(2) To verify the Information, or I f no amount Is
Indicated, measure the head height (Fig. 123).
(3) I f the head height is 94.75 mm (3.730 inch) or
greater, the valve seats may be ground, i f they have
not been ground previously.
Fig. 123 Cylinder Head Height
TAPPET
INSPECTION
Inspect the tappet socket, stem and face for exces­
sive wear, cracks and other damage (Fig. 124).