Specification; Refacing Valves And Valve Seats; Crankshaft End Play - Chrysler 1998 Viper RT/10 Owner's Manual

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S E R V I C E P R O C E D U R E S ( C o n t i n u e d )
CRANKSHAFT SPECIFICATION CHART
Mam B e a r i n g C l e a r a n c e
N e w Part: 0.025 - 0.051 m m (0.001 - 0 . 0 0 2 in.)
W e a r Limit: 0.076 m m (0.003 in.)
C r a n k s h a f t J o u r n a l S i z e s
C r a n k s h a f t M a i n Bearing J o u r n a l Diameter
S t a n d a r d : H i g h 7 6 . 2 5 1 - 7 6 . 2 6 4 m m
( 3 . 0 0 2 0 - 3 . 0 0 2 5 in.)
S t a n d a r d : L o w 7 6 . 2 3 8 - 7 6 . 2 5 1 m m
( 3 . 0 0 1 5 - 3 . 0 0 2 0 in.)
C r a n k s h a f t C o n n e c t i n g R o d J o u r n a l
S t a n d a r d : 53.951 - 5 3 . 9 7 5 m m (2.124 - 2 . 1 2 5 in.)
Fig. 13 Bearing Clearance Measuring with
Plastigage
(5) Carefully remove the bearing cap and measure
the w i d t h of the plastigage at the widest part using
the scale on the plastigage package (Fig. 13). Refer to
Crankshaft Specification Chart for proper clearances.
I f the clearance exceeds the specified l i m i t s . Replace
the m a i n bearing(s) and i f necessary have the crank-
shaft machined to next undersize. Also see Measur-
i n g M a i n and Connecting Rod Bearing Clearance i n
Standard Service Procedures.
C A U T I O N : D o n o t r o t a t e c r a n k s h a f t o r t h e P l a s t i -
g a g e m a y b e s m e a r e d .
8.0L ENGINE 9 - 17
9309-56
Fig. 14 Crankshaft End Play Measuring
CRANKSHAFT END PLAY CHECK—OPTIONAL
(1) Move crankshaft a l l the way to the rear of its
travel using a lever inserted between a m a i n bearing
cap and a crankshaft cheek using care not to damage
any bearing surface. D o n o t loosen m a i n bearing
cap.
(2) Use a feeler gauge between number 3 t h r u s t
bearing and machined crankshaft surface to deter-
mine end play. Refer to Crankshaft End-Play Table
for specification.
CRANKSHAFT END-PLAY
C r a n k s h a f t E n d - P l a y
N e w Part: 0.05 - 0.18 mm (0.002 - 0.007 in.)
D e s i r e d : 0.013 m m (0.005 in.)
W e a r Limit: 0.25 m m (0.010 in.)
REFACING VALVES AND VALVE SEATS
The intake and exhaust valves have a 44 1/2 - 45
degree face angle. The valve seats have a 45 1/2 - 46
degree face angle. The valve face and valve seat
angles are shown i n (Fig. 15).
Inspect the remaining margin after the valves are
refaced. Refer to Valve Dimension Chart for specifi-
cations.
V A L V E S E A T S
CRANKSHAFT END PLAY
(1) M o u n t a dial indicator to front of engine, locat-
i n g probe on nose of crankshaft (Fig. 14).
(2) Move crankshaft a l l the way to the rear of its
travel.
(3) Zero the dial indicator.
(4) Move crankshaft a l l the way to the front and
read the dial indicator. Refer to Crankshaft End-Play
Table for specification.
C A U T I O N : D o n o t u n - s h r o u d v a l v e s d u r i n g v a l v e
s e a t r e f a c i n g ( F i g . 1 6 ) .
(1) W h e n refacing valve seats, i t is important t h a t
the correct size valve guide pilot be used for reseat-
i n g stones. A true and complete surface must be
obtained.
(2) Measure the concentricity of valve seat using a
dial indicator. Total r u n o u t should not exceed 0.051
m m (0.002 in.) t o t a l indicator reading.