INSPECTION FOR REAR SEAL AREA LEAKS
Since it is sometimes difficult to determine the source of an oil leak in the rear seal area of the engine, a more
involved inspection is necessary. The following steps should be followed to help pinpoint the source of the leak.
If the leakage occurs at the crankshaft rear oil seal area:
1. Disconnect the battery.
2. Raise the vehicle.
3. Remove torque converter or clutch housing cover and inspect rear of block for evidence of oil. Use a
black light to check for the oil leak. If a leak is present in this area, remove transmission for further
inspection.
a. Circular spray pattern generally indicates seal leakage or crankshaft damage.
b. Where leakage tends to run straight down, possible causes are a porous block, oil gallery cup plug,
bedplate to cylinder block mating surfaces and seal bore. See proper repair procedures for these
items.
4. If no leaks are detected, pressurize the crankcase as previously described in step 5 in ENGINE OIL
LEAK INSPECTION.
5. 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 the crankshaft seal
surface is damaged. The seal area on the crankshaft could have minor nicks or scratches that can be
polished out with emery cloth.
6. For bubbles that remain steady with shaft rotation, no further inspection can be done until disassembled.
7. After the oil leak root cause and appropriate corrective action have been identified, replace component(s)
as necessary.
CYLINDER COMPRESSION PRESSURE TEST
CAUTION: Do not exceed 20.6 kPa (3 psi).
CAUTION: Use extreme caution when crankshaft polishing is necessary to
remove minor nicks and scratches. The crankshaft seal flange is
especially machined to complement the function of the rear oil seal.
CAUTION: Do not exceed 20.6 kPa (3 psi).
CAUTION: Use extreme caution when crankshaft polishing is necessary to
remove minor nicks and scratches. The crankshaft seal flange is
especially machined to complement the function of the rear oil seal.
2010 Jeep Wrangler Sport
2010 ENGINE 3.8L - Service Information - Wrangler
viernes, 1 de octubre de 2021 05:18:29 p. m.
Page 7
© 2011 Mitchell Repair Information Company, LLC.
