Table of Contents
Advertisement
SHORT STAMPED
RETAINERS
LONG STAMPED
RETAINERS
"NOTCH"
(END OF ROCKER SHAFT)
RP123
Fig. 3 Rocker Arm Retainers and NOTCH Location
CYLINDER HEADS
T h e alloy cast i r o n cylinder heads shown i n (Fig. 4)
are h e l d i n place b y eight bolts. The spark p l u g s are
located i n peak o f the wedge between t h e valves.
REMOVAL
(1) D r a i n cooling system.
(2) Disconnect battery ground cable.
(3) Remove alternator, t h r o t t l e body, a i r cleaner
a n d fuel line.
(4) Disconnect accelerator linkage.
INTAKE
VALVES
SPARK
PLUGS
OIL FEED
HOLE
COOLAN
PASSAGE
EXHAUST VALVES
RP121
Fig. 4 Cylinder Head Assembly
(5) Remove d i s t r i b u t o r cap and wires.
(6) Disconnect coil wires, heat indicator sending
u n i t w i r e , heater hoses and bypass hose.
(7) Remove closed v e n t i l a t i o n system, evaporation
control system and cylinder head covers.
(8) Remove i n t a k e manifold, and t h r o t t l e body as
a n assembly.
(9) Remove exhaust manifolds.
(10) Remove rocker a r m and shaft assemblies. Re-
move push rods and identify to ensure i n s t a l l a t i o n i n
o r i g i n a l locations.
(11) Remove t h e head bolts f r o m each
cylinder
head and remove cylinder heads.
(12) Place cylinder heads i n h o l d i n g f i x t u r e Tool C-
3626. Remove spark plugs.
INSTALLATION
(1) Clean a l l surfaces o f cylinder block and cylinder
heads.
(2) Inspect a l l surfaces w i t h a straightedge i f there
is any reason to suspect leakage. I f out of flatness ex-
ceeds 0.00075 mm/mm (0.00075 inch/inch) times t h e
span l e n g t h i n inches i n any direction, either replace
head or l i g h t l y machine t h e head surface.
F O R E X A M P L E — I f a 305 m m (12 i n c h ) s p a n i s
0.102 m m (0.004 inch) out o f flat, a l l o w a b l e i s 305
X 0.00075 (12 X 0.00075) e q u a l s 0.23 m m (0.009
i n c h ) . T h i s a m o u n t o f o u t o f flat i s a c c e p t a b l e .
(3) The cylinder head surface f i n i s h should be 1.78-
4.57 microns (70-180 microinches).
(4) I n s t a l l new gaskets o n cylinder block.
(5) Remove cylinder heads from h o l d i n g fixtures
and place heads o n engine.
(6) O n 6 cylinder engines bolt t h r e a d sealer is not
required. S t a r t i n g a t top center, t i g h t e n a l l cylinder
head bolts t o 68 N-m (50 ft. lbs.) torque i n sequence
(Fig. 5). Repeat procedure, t i g h t e n a l l cylinder head
bolts to 143 N-m (105 f t . lbs.) torque. Repeat proce-
dure t o confirm t h a t a l l bolts are a t 143 N-m (105 f t .
lbs.) torque.
/
RP122
Fig. 5 Cylinder Head Bolt Tightening Sequence
(7) Inspect push rods a n d replace w o r n or bent
rods.
(8) I n s t a l l push rods, rocker a r m and shaft assem-
blies w i t h t h e N O T C H o n t h e end o f rocker shaft
p o i n t i n g to centerline o f engine and t o w a r d front (left
bank) and to the rear ( r i g h t bank). T h e notch is a l -
ways to left as facing cylinder head. M a k e sure t o i n -
s t a l l the long stamped steel retainers i n the n u m b e r
two and four positions. T i g h t e n the bolts t o 23 N - m
(200 i n . lbs.) torque (Fig. 6).
(9) Coat i n t a k e manifold side gaskets l i g h t l y w i t h
sealer. R I G H T and L E F T side gaskets are required.
Cutouts a t top front of each gasket ( L T for left side
and R T for r i g h t side) identifies each gasket position
(Fig. 6).
(10) I n s t a l l side gaskets t o cylinder head.
Advertisement
Table of Contents
