Dakota 4WD V6-239 3.9L VIN X FI (1989)
4.
Attach an air hose with a pressure gauge and regulator to the dipstick tube.
5.
Disconnect the breather cap-to-air cleaner hose at the breather cap end. Cap or plug the breather cap nipple.
6.
Remove the PCV valve from the cylinder head cover. Cap or plug the PCV valve grommet.
7.
After the engine is sealed, set the air pressure regulator NO HIGHER than 3 psi (27 kpa).
8.
Gradually apply air pressure from 1 to 2.5 psi maximum. Using a liquid soap solution or stethoscope, inspect all suspected oil leak areas. Repair
per the Service Manual instructions or per procedures found in this TSB.
9.
If the leak is not detected, very slowly turn the crankshaft and watch for leakage.
If a leak is detected between the crankshaft and seal (while slowly turning the crankshaft), it is possible that the crankshaft seal surface is damaged.
10.
For bubbles that remain steady with the shaft rotation, no further inspection can be done until additional disassembly of the seal is made.
11.
If no other leaks are detected, turn off the air supply. Remove the air hose and all plugs previously installed. Install the PCV valve and breather
cap hose.
OIL LEAK CONDITIONS:
NOTE:
THE FOLLOWING OIL LEAK CONDITIONS INCLUDE ABBREVIATED CORRECTIONS. REFER TO THE APPROPRIATE SERVICE
MANUAL FOR ADDITIONAL DETAILED REPAIR INSTRUCTIONS.
REAR MAIN CAP-TO-OIL PAN
Possible causal conditions may be:
