B3000 SE Regular Cab 2WD V6-3.0L OHV (2002)
Oil Filter: All Technical Service Bulletins
Engine - Lower Engine Oil Leaks
01-003/04
B-SERIES 3.0L
LOWER ENGINE OIL LEAK
DIAGNOSTIC - SERVICE TIP
APPLICABLE MODEL(S)/VINS
2000-2004 Truck/B3000
DESCRIPTION
When diagnosing an engine oil leak on the 3.0L engine, it may appear oil is leaking from the rear main crank seal. Engine oil leaking from the oil filter
gasket, oil drain plug or oil pan gasket will migrate onto the oil pan gasket and collect at the rear half round of the oil pan, causing misdiagnosis of a
leaking rear main crank seal.
To service, follow the Repair Procedure below to accurately diagnose source of oil leak. If areas listed below are verified not to be the source of the oil
leak, continue with normal diagnostics per Workshop Manual.
REPAIR PROCEDURE
1.
Clean the engine of oil residue prior to diagnosing.
NOTE:
An extremely small (slow) oil leak may require several hours of vehicle operation for leak to appear. If engine is not cleaned prior to diagnosis,
existing oil residue may lead to a false diagnosis.
2.
Use the fluorescent oil additive method to determine the leak path. Refer to the Workshop Manual - Engine - Troubleshooting Section 01-01,
Engine Oil Leaks - Fluorescent Oil Additive Method under ENGINE COMPONENT TESTS. After determining source of leak, repair as
necessary.
LOCATIONS TO CHECK FOR POSSIBLE OIL LEAKS
Oil Filter: The oil filter may not be tightened to the correct specification. If a leak is detected at the filter, tighten the filter. If filter still leaks, replace oil
filter.
NOTE:
Be sure to tighten the filter to the desired 3/4 to 1 full turn after initial seal contact as specified on oil filter instructions.
Oil Pan Gasket: Inspect for oil along the oil pan rail. Also, inspect for oil at the T-joint to front cover and at the corner of the rear half round. If oil is
found and did not originate from the oil filter, replace the oil pan gasket.
NOTE:
When replacing oil pan gasket, cleaning all oil residue and proper RTV placement/application is critical to effective oil pan gasket sealing. Refer to
applicable model year workshop manual for correct silicone bead size and location.
Engine Oil Drain Plug: Possible worn drain plug O-ring. Replace if necessary. Oil drain plug should be torqued to 23 Nm (17 ft.-lb.).