Chrysler RAM TRUCK 2500 1994 Service Manual page 853

9 - 132 5.9L (DIESEL) ENGINE
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Trim off the top of the valve guides flush to top of
guide bosses, i f necessary.
Machine the valve guide bores to 8.029 ±0.010 mm
(0.3161 ±0.0004 inch) - (Fig. 6).
The valve guide bore must be centered with the
valve seat within 0.35 mm (0.0138 inch) diameter. I t
also must be square with the combustion face within
0.010 mm (0.0004 inch) at 50.0 mm (2.0 inch) radius.
THICK WALL-SERVICE GUIDES
VALVE GUIDE BORES
VALVE GUIDE BORES
EXHAUST
CYLINDER
HEAD
INTAKE
r^7
CYLINDER HEAD VALVE GUIDE BORES
CYLINDER HEAD VALVE GUIDE BORES
11.125 ± 0 . 0 1 3 mm (0.438 ± 0.0005 in)
VALVE GUIDE BORES
8.029 ± 0 . 0 1 0 mm (0.3161 ± 0 . 0 0 0 4 in)
J9109-136
Fig. 6 Service Valve Guides—Thin Wall
Machine the cylinder head valve guide bores to
14.000 ±0.013 mm (0.5512 ±0.0005 inch) diameter
(Fig. 7).
Valve guides must be centered with valve seats
within 0.35 mm (0.01378 inch) diameter. Valve
guides must also be square with the combustion face
within 0.10 mm (0.004 inch) at 50.0 mm (2.0 inch)
radius.
Lubricate the valve guides with oil and press i n the
guides to 12.25 ±0.50 mm (0.4823 ±0.020 inch) pro­
trusion above the cylinder head.
Ream the bores to 8.029 ±0.010 mm (0.3161
±0.0004 inch) - (Fig. 7).
WALWE SPRINGS
Measure the valve spring length. The approximate
free length is 55.63 mm (2.190 inch) with the maxi­
mum inclination of 1.0 mm (0.039 inch).
Measure the valve spring force. 289.32 N (65 lbs.)
is the minimum acceptable load required to compress
the spring to a height of 49.25 mm (1.94 inch).
I f the valve spring does not meet the limits above,
replace the spring.
EXHAUST
CYLINDER
HEAD
INTAKE
CYLINDER HEAD VALVE GUIDE BORES
CYLINDER HEAD VALVE GUIDE BORES
14.000 ± 0 . 0 1 3 mm (0.5512 ± 0.0005 in)
VALVE GUIDE BORES
8.029 ± 0 . 0 1 0 mm (0.3161 ± 0 . 0 0 0 4 in)
J9109-137
Fig. 7 Service Valve Guides—Thick Wall
WALWE 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. 8).
Two X's stamped on the head indicate service seats
have been installed (Fig. 8). Service seats can be
ground.
SERVICE SEATS
INSTALLED
Fig. 8 Reworked Cylinder Head Seats-
Identification .
J 9 1 0 9 - 1 3 8
-Stamped
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.