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