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its. E n g i n e i s e q u i p p e d w i t h e x h a u s t v a l v e r o t a -
t o r s , d o n o t g r i n d e x h a u s t v a l v e s t e m t i p .
RF259
Fig. 17 Testing Valve Spring for Compressed
Length with Tool C-647
tions t o o b t a i n specified height a n d allowable ten-
sions.
Discard
t h e springs
t h a t
do n o t meet
specifications.
(2) Inspect each valve spring for squareness w i t h a
steel square a n d surface plate, test springs from both
ends (Fig. 18). I f t h e s p r i n g is more t h a n 1.984 m m
(5/64 inch) out-of-square, i n s t a l l a new spring.
~~
VALVE SPRING
S Q U A R E
RF180
Fig. 18 Checking Valve Spring for Squareness
INSTALLATION
CAUTION: Installing the wrong exhaust valve spring
in engines with positive rotators can cause severe
engine damage. Refer to specifications for proper
identification.
(1) Coat valve stems w i t h l u b r i c a t i o n o i l and insert
t h e m i n cylinder head.
(2) I f valves or seats are reground, check valve
stem height w i t h Tool C-3968 (Fig. 19). I f valve is
too long, g r i n d off the t i p u n t i l l e n g t h is w i t h i n l i m -
TOOL
Fig. 19 Measuring Valve Stem Length with Tool
C-396B
(3) I n s t a l l new seals on a l l valve stems a n d over
valve guides ( F i g . 20). I n s t a l l valve springs a n d
valve retainers.
RETAINER
SPRING
INTAKE VALVE
RH150A
Fig. 20 Installing Valve, Cup Seal, Spring and
Retainer
(4) Compress valve springs w i t h Tool C-3422-A, i n -
s t a l l locks and release tool. I f valves and/or seats are
reground, measure t h e installed height of springs,
make sure measurement is t a k e n from bottom of
spring seat i n cylinder head t o t h e bottom surface of
spring retainer ( i f spacers
a r e installed, measure
f r o m t h e top o f spacer). I f h e i g h t is greater
t h a n
42.86 m m (1-11/16 inches), i n s t a l l a 1.587 m m (1/16
inch) spacer i n head counterbore t o b r i n g s p r i n g
h e i g h t back to n o r m a l 41.27 t o 42.86 m m (1-5/8 t o 1-
11/16 inch). Exhaust valve springs w i t h positive ro-
tators should have a length o f 36.8-38.1 m m (1.45-
1.51 inch) w h e n t h e valve is closed.
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