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5.2L/5.9L ENGINE
9 - 47
Fig.
18 Measuring
Valve Stem Length with Tool
C-3968
too long, g r i n d off t i p u n t i l l e n g t h is w i t h i n l i m i t s . I f
e n g i n e i s e q u i p p e d w i t h r o t a t o r s , d o n o t g r i n d
v a l v e s t e m tip.
(3) I n s t a l l n e w cup seals on a l l valve stems a n d
over valve guides (Fig. 19). I n s t a l l valve springs a n d
valve retainers.
(4) Compress valve springs w i t h Tool C-3422-A, i n -
s t a l l locks a n d release tool. I f valves and/or seats are
reground, measure t h e installed height o f springs,
m a k e sure measurement is t a k e n f r o m bottom o f
s p r i n g seat i n cylinder head to t h e bottom surface o f
spring r e t a i n e r ( i f spacers are installed, measure
f r o m t h e t o p o f spacer). I f height 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 to b r i n g s p r i n g
h e i g h t back t o n o r m a l 41.27 t o 42.86 m m (1-5/8 t o
1-11/16 inches) E x h a u s t valve springs w i t h positive
rotators should have a l e n g t h o f 36.8-38.1 m m (1.45-
1.51 inch) w h e n t h e valve is closed.
Fig.
19 Installing Valve, Cup Seal, Spring,
and
Retainer
REPLACING
VALVE STEM SHIELDS
OR VALVE
SPRINGS,
CYLINDER
HEAD NOT
REMOVED
(1) Set engine basic t i m i n g to T D C and remove A i r
Cleaner.
(2) Remove cylinder head covers and spark plugs.
(3) Remove coil w i r e from d i s t r i b u t o r and secure t o
good g r o u n d to prevent engine f r o m s t a r t i n g .
(4) U s i n g suitable socket and flex handle a t crank-
shaft p u l l e y r e t a i n i n g bolt, t u r n engine so the n u m -
ber
1 piston is a t Top Dead
Center
on t h e
compression stroke.
(5) Remove rocker arms w i t h rocker shaft and i n -
s t a l l a d u m m y shaft. (The rocker arms should not be
disturbed and left on shaft).
(6) W i t h a i r hose attached to adapter Tool C-3907
installed i n number 1 spark p l u g hole, apply 620 t o
689 k P a (90 to 100 psi) a i r pressure. M a k e sure pis-
t o n i n cylinder is a t TDC on the valve spring t h a t is
being removed.
(7) U s i n g Tool C-3906 or C-4228 compress
valve
spring a n d remove retainer valve locks a n d valve
spring.
(8) I n s t a l l cup shields on t h e exhaust valve stem
and position down against valve guides.
(9) T h e i n t a k e valve stem seals should be pushed
f i r m l y and squarely over the valve guide using t h e
valve stem as a guide. DO N O T Force seal against
top o f guide. W h e n i n s t a l l i n g t h e valve
r e t a i n e r
locks, compress the spring only enough t o i n s t a l l t h e
locks.
(10) Follow the same procedure on the r e m a i n i n g 7
cylinders using the f i r i n g sequence 1-8-4-3-6-5-7-2.
(11) Remove adapter Tool 3907.
(12) Remove d u m m y shaft and i n s t a l l rocker shaft
w i t h rocker arms.
(13) I n s t a l l covers and coil w i r e to distributor.
(14) I n s t a l l a i r cleaner.
(15) Road test vehicle.
HYDRAULIC TAPPETS
PRELIMINARY
STEP TO CHECKING
THE
HYDRAULIC
TAPPETS
Before disassembling any part o f the engine to cor-
rect tappet noise, read the oil pressure a t the gauge
( I n s t a l l a reliable gauge at pressure sending u n i t i f
vehicle has no o i l pressure gauge) and check o i l level
i n the o i l pan. The pressure should be between 207 t o
552 k P a (30 and 80 psi) a t 3000 r p m .
The o i l level i n the pan should never be above t h e
F U L L m a r k on the dipstick, or below the A D D O I L
m a r k . E i t h e r of these two conditions could be respon-
sible for noisy tappets.
OIL LEVEL
TOO HIGH
I f o i l level is above the F U L L m a r k on dipstick, i t
is possible for the connecting rods to dip i n t o the o i l
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