Engine Diagnosis-Mechanical - Chrysler 1998 Viper RT/10 Owner's Manual

9 - 8 ENGINE —
D I A G N O S I S A N D T E S T I N G ( C o n t i n u e d )
ENGINE DIAGNOSIS—MECHANICAL
S R
C O N D I T I O N
P O S S I B L E C A U S E S C O R R E C T I O N
N O I S Y V A L V E S
1. High or low oil level in
c r a n k c a s e .
2. T h i n or diluted oil.
3. L o w oil p r e s s u r e .
4. Dirt in t a p p e t s / l a s h a d j u s t e r s .
5. Bent p u s h rod(s).
6. W o r n rocker a r m s .
7. W o r n t a p p e t s / l a s h a d j u s t e r s .
8. W o r n v a l v e g u i d e s .
9. E x c e s s i v e runout of v a l v e s e a t s
o n v a l v e f a c e s .
1. C h e c k for correct oil level. Adjust oil level by
draining or a d d i n g a s n e e d e d .
2. C h a n g e oil. Refer to Engine Oil Service in
this g r o u p .
3. C h e c k e n g i n e oil level. If O K , p e r f o r m oil
pressure test. Refer to this g r o u p for e n g i n e oil
pressure test/specification.
4. C l e a n / r e p l a c e hydraulic tappets/lash
adjusters.
5. R e p l a c e p u s h rod(s) a s necessary.
6. Replace w o r n rocker a r m s a n d inspect oil
supply to rocker a r m s .
7. R e p l a c e hydraulic tappets/hydraulic lash
adjusters.
8. R e a m a n d install n e w v a l v e s with oversize
s t e m s .
9. G r i n d v a l v e seats a n d v a l v e s .
C O N N E C T I N G R O D
N O I S E
1. Insufficient oil supply.
2. L o w oil p r e s s u r e .
3. T h i n or diluted oil.
4. E x c e s s i v e b e a r i n g c l e a r a n c e .
5. C o n n e c t i n g rod j o u r n a l
o u t - o f - r o u n d .
6. M i s a l i g n e d c o n n e c t i n g rods.
1. C h e c k e n g i n e oil level. Refer to G r o u p 0,
Lubrication a n d M a i n t e n a n c e .
2. C h e c k e n g i n e oil level. If O K , perform oil
pressure test. Inspect oil p u m p relief v a l v e a n d
spring. Refer to this g r o u p for e n g i n e oil
pressure test/specification.
3. C h a n g e oil. Refer to Engine Oil Service in
this g r o u p .
4. M e a s u r e bearings for correct c l e a r a n c e .
Repair a s necessary.
5. Replace crankshaft or grind j o u r n a l s .
6. R e p l a c e bent c o n n e c t i n g rods.
M A I N B E A R I N G N O I S E
1. Insufficient oil supply.
2. L o w oil p r e s s u r e .
3. T h i n or diluted oil.
4. E x c e s s i v e b e a r i n g c l e a r a n c e .
5. E x c e s s i v e e n d play.
6. C r a n k s h a f t j o u r n a l o u t - o f - r o u n d
and/or w o r n .
7. L o o s e f l y w h e e l .
1. C h e c k e n g i n e oil level. Refer to G r o u p 0,
Lubrication a n d M a i n t e n a n c e .
2. C h e c k e n g i n e oil level. If O K , perform oil
pressure test. Inspect oil p u m p relief valve a n d
spring. Refer to this g r o u p for e n g i n e oil
pressure test/specification.
3. C h a n g e oil. Refer to Engine Oil Service in
this g r o u p .
4. M e a s u r e bearings for correct clearance.
Repair a s necessary.
5. C h e c k N o . 3 bearing for w e a r o n f l a n g e s .
6. G r i n d j o u r n a l s or replace crankshaft.
7. Inspect crankshaft, f l y w h e e l , a n d bolts for
d a m a g e . Tighten bolts to correct t o r q u e .