Chrysler RAM TRUCK 2500 1994 Service Manual page 735

9 - 14 ENGINES
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SERVICE DIAGNOSIS (DIESEL ENGINE) - MECHANICAL
CONDITION
POSSIBLE CAUSES CORRECTION
LUBRICATING OIL
PRESSURE L O W
Low oil level. (a) C h e c k a n d f i l l w i t h c l e a n e n g i n e oil.
(b) C h e c k f o r a s e v e r e e x t e r n a l o i l l e a k t h a t c o u l d r e d u c e t h e
p r e s s u r e .
O i l viscosity thin, d i l u t e d o r
w r o n g s p e c i f i c a t i o n .
V e r i f y t h e c o r r e c t o i l is b e i n g u s e d . C h e c k for o i l d i l u t i o n . Refer
t o C o n t a m i n a t e d L u b e O i l ( E n g i n e D i a g n o s i s — M e c h a n i c a l ) .
I m p r o p e r l y o p e r a t i n g p r e s s u r e
switch/gauge.
V e r i f y t h e p r e s s u r e s w i t c h is f u n c t i o n i n g c o r r e c t l y . If n o t ,
r e p l a c e s w i t c h / g a u g e .
Relief valve stuck open.
C h e c k / r e p l a c e v a l v e .
P l u g g e d o i l f i l t e r .
C h a n g e o i l f i l t e r . O i l f i l t e r c h a n g e i n t e r v a l m a y n e e d t o b e
r e v i s e d .
If cooler was r e p l a c e d , s h i p p i n g
p l u g s left i n c o o l e r .
C h e c k / r e m o v e s h i p p i n g p l u g s .
If p u m p r e p l a c e d , f o u r c y l i n d e r
o i l p u m p i n s t a l l e d i n a s i x
c y l i n d e r e n g i n e .
V e r i f y t h a t t h e c o r r e c t p u m p is i n s t a l l e d . If n o t , i n s t a l l a n o i l
p u m p f o r a s i x c y l i n d e r e n g i n e .
Loose o r m i s s i n g c u p p l u g s . Check a n d r e p l a c e c u p p l u g s .
W o r n o i l p u m p . Check a n d r e p l a c e o i l p u m p .
Suction t u b e l o o s e o r s e a l
l e a k i n g .
C h e c k a n d r e p l a c e s e a l .
Loose m a i n b e a r i n g c a p .
Check a n d i n s t a l l n e w b e a r i n g s a n d t i g h t e n c a p t o p r o p e r t o r q u e .
W o r n b e a r i n g s o r w r o n g
b e a r i n g s i n s t a l l e d .
Inspect a n d r e p l a c e c o n n e c t i n g r o d o r m a i n b e a r i n g s . C h e c k a n d
r e p l a c e p i s t o n c o o l i n g n o z z l e s .
J9109-237