Dodge ram truck 3500 1996 Service Manual page 1003

B R
- — - — — ENGINE 9 - 1 3
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 )
SERVICE DIAGNOSIS—GASOLINE—LUBRICATION
CONDITION POSSIBLE CAUSED
CORRECTION
OIL LEAKS 1. Gaskets and O-Rings.
(a) Misaligned, deteriorated or torn.
(b) Loose fastener, broken or porous
metal part.
2. Crankshaft Rear Seal
(a) Misinstalled, inverted or torn lip
(b) Torn, cut or shaved seal back bead.
3. Crankshaft Seal Flange.
Scratched, nicked or grooved.
4. Cylinder block to Cap Mating Surface.
(a) Inadequate Loctite sealant.
(b) Oil hole burr.
5. Oil Pan to Rear Main Cap Sealant
(Slots 3.9 - 5.2 only).
(a) inadequate or mislocated sealant.
(b) Torn, cut or misinstalled oil pan.
(c) Cracked or damaged oil pan flange.
6. Chain Case Cover Seal.
(a) Misinstalled, cocked or misaligned.
(b) Torn, cut or damaged seal lips.
(c) Scratched or damaged seal casing
or cover bore.
(d) Scratched or damaged vibration
damper hub.
1.
(a) Replace the part.
(b) Tighten, repair or replace the part.
2.
(a) Replace the seal.
(b) Replace the seal.
3.
Replace or polish if necessary.
4.
(a) Apply sealant per sealant per service
manual.
(b) Carefully stone or chamfer hole.
5.
(a) Apply sealant per service manual
procedures.
(b) Replace the gasket.
(c) Replace the oil pan.
6.
(a) Replace per service manual procedures.
(b) Replace the seal.
(c) Replace the seal.
(d) Minor damage can be polished out;
otherwise replace the part.
OIL PRESSURE DROP 1. Low oil level.
2. Faulty oil pressure sending unit.
3. Low oil pressure.
4. Clogged oil filter.
5. Worn parts in oil pump.
6. Thin or diluted oil.
7. Excessive bearing clearance.
8. Oil pump relief valve stuck.
9. Oil pump suction tube loose
;
bent or
cracked.
10. Oil pump cover warped or cracked.
1. Check engine oil level.
2. Install new sending unit.
3. Check sending unit and check main bearing
oil clearance.
4. Install new oil filter.
5. Replace worn parts or pump.
6. Change oil to correct viscosity.
7. Measure bearings for correct clearance.
8. Remove valve and inspect, clean and install.
9. Remove oil pan and install new tube, if
necessary.
10. Install new oil pump.
OIL PUMPING AT RINGS;
SPARK PLUGS FOULING
1. Worn, scuffed or broken rings.
2. Carbon in oil ring slot.
3. Rings fitted too tightly in grooves.
4. Worn valve guides.
5. Leaking intake gasket (3.9L &
5.2L engines).
6. Leaking valve guide seals (3.9L &
5.2L engines).
7. Dislodged valve guide seals (3.9L &
5.2L engines).
1. Hone cylinder bores and install new rings.
2. Install new rings.
3. Remove the rings. Check grooves. If
grooves are not proper width, replace piston.
4. Ream guides and replace valves with
oversize valves and seals.
5. Replace gasket and tighten intake manifold
to proper torque.
6. Replace seals.
7 Seat valve guide seals or replace, as
n e e d e d
J9509-61