Bronco L6-300 4.9L VIN Y 1-bbl (1983)
Crankshaft Main Bearing Seal: Technical Service Bulletins
Crankshaft Seal - Leaks, Air Pressure Test
Article No. 86-3-14
LEAK OIL - CRANKSHAFT SEAL - AIR PRESSURE TEST
FORD 1986 and Prior FORD, THUNDERBIRD, LTD, ESCORT, FAIRMONT, MUSTANG, EXP, TAURUS
LINCOLN-MERCURY 1986 and Prior LINCOLN, MARK, CONTINENTAL, MERCURY, MARQUIS, COUGAR, CAPRI, LYNX, LN7, SABLE
LIGHT TRUCK 1986 and Prior RANGER, BRONCO II, AEROSTAR, E AND F SERIES
To prevent repeat servicing on engines suspected of oil leakage at the crankshaft seal, determine if the leak is actually from the seal or from another
source such as the rear pan seal or galley plugs. The one-piece rear crankshaft seal is released for all passenger car and light truck engines and has
proven to be more reliable than the rope or split lip design formerly used.
Performing the oil leak air pressure check outlined in all Car and Truck Powertrain Shop Manuals, Section 21- 01 will accurately identify the location of
the leak and can verify correction after servicing before the transmission is reinstalled.
OTHER APPLICABLE ARTICLES: 80-15-5, 83-14-8
WARRANTY STATUS: "INFORMATION ONLY"
