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5.2L/5.9L ENGINE
9 - 45
Fig. 10 Positioning
Valve with Tool C-3973
VALVE /
Fig. 11 Measuring
Valve Guide
Wear
(c) Move valve to and f r o m t h e indicator. T h e
t o t a l d i a l i n d i c a t o r reading should n o t exceed 0.432
m m (0.017 inch). Ream t h e guides for valves w i t h
oversize stems i f d i a l indicator r e a d i n g is excessive
or i f t h e stems are scuffed or scored.
Service valves w i t h oversize stems are available i n
0.127 m m (0.005 inch), 0.381 m m (0.015 inch) a n d
0.762 m m (0.030 inch) inch oversize. Reamers to ac-
commodate t h e oversize valve stem are as follows
(Fig. 12):
Reamer
Tool No.
Reamer
Oversize
Valve Guide
Size
C-3433
0.127 mm
9.63-9.65 mm
(0.005 inch)
(0.379-0.380 inch)
C-3430
0.381 mm
9.88-9.91 mm
(0.015 inch)
(0.389-0.390 inch)
C-3427
0.762 mm
10.26-10.29 mm
(0.030 inch)
(0.404-0.405 inch)
J9009-100
Slowly t u r n reamer b y h a n d a n d clean guide t h o r -
oughly before i n s t a l l i n g n e w valve. D O N O T a t -
t e m p t t o r e a m t h e v a l v e g u i d e s f r o m s t a n d a r d
d i r e c t l y t o 0 . 7 6 2 m m (0.030 i n c h ) . U s e s t e p p r o c e -
d u r e o f 0.127 m m
f
0.381 m m a n d 0.762 m m (0.005
i n c h , 0.015 i n c h a n d 0.030 i n c h ) so t h e v a l v e
g u i d e s m a y b e r e a m e d t r u e i n r e l a t i o n t o t h e
v a l v e seat.
REFACING
VALVES AND VALVE
SEATS
The i n t a k e and exhaust valve seats a n d valve faces
have a 45° angle. The valve face a n d valve seat a n -
gles are shown i n (Fig. 13).
A-SEAT WIDTH (INTAKE 1/16 (1.587 mm) TO 3/32 (2.381 mm) INCH
EXHAUST: (.08O-.1OO INCH) - (2-23 mm)
B-FACE ANGLE (INTAKE & EXHAUST: 44^°-45°)
C-SEAT ANGLE (INTAKE & EXHAUST: 45°-45M
e
)
D-CONTACT SURFACE
PU605
Fig. 13 Valve Face and Seat
Angles
VALVES
Inspect the r e m a i n i n g m a r g i n after t h e valves are
refaced. Valves w i t h less t h a n 1.190 m m (3/64 inch)
m a r g i n should be discarded (Fig. 14).
JL
INTAKE
VALVE
EXHAUST
VALVE
PU606
Fig. 14 Intake and Exhaust Valves
(Typical)
Fig. 12 Reamer
Sizes
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