Dodge D150 1990 Service Manual page 630

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 length 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 i n c h ) o u t 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 f l a t 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 f i x t u r e s
and place heads on engine.
(6) Thread sealer is not required. S t a r t i n g a t t o p
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. 4). Repeat procedure,
t i g h t e n a l l cylinder head bolts t o 143 N - m (105 ft.
lbs.) torque. Repeat procedure t o c o n f i r m t h a t a l l
bolts are at 143 N-m (105 ft. lbs.) torque.
Fig. 4 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 a n d shaft assem-
blies w i t h t h e N O T C H on t h e e n d o f rocker shaft
p o i n t i n g to centerline of engine a n d 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 t h e long stamped steel retainers i n t h e n u m b e r
t w o and four positions. T i g h t e n the bolts t o 23 N - m
(200 i n . lbs.) torque.
(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 r e q u i r e d .
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. 5).
(10) I n s t a l l side gaskets t o cylinder head.
(11) Clean cylinder block f r o n t a n d rear gasket sur-
faces using a suitable solvent (Fig. 6).
(12) Apply a t h i n , u n i f o r m coating o f a q u i c k d r y
cement to the i n t a k e manifold f r o n t a n d rear gaskets
and cylinder block gasket surface. W h e n i n s t a l l i n g
Fig. 5 Engine Intake Manifold Side Gaskets (Left
Side Shown)—5.2L
gaskets, the center hole i n t h e gasket M U S T engage
dowels i n block. E n d holes i n seals M U S T be locked
i n t o tangs of head gasket (Fig. 6). A l l o w t o d r y 4 to 5
minutes or u n t i l tack free.
Fig. 6 Intake Manifold Sealing
(13) Carefully i n s t a l l t h e front a n d rear i n t a k e
manifold gaskets.
(14) Place drop (approximately 1/4" diameter) o f
rubber sealer R T V onto each of the four manifold t o
cylinder head gasket corners.
(15) Carefully lower i n t a k e manifold i n t o position
on t h e cylinder block and cylinder heads. After i n -
take manifold is i n place, inspect to make sure seals
are i n place.