Ford Contour Engine >> BEARING FAILURES
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Ford Contour Engine >> BEARING FAILURES
Bearing Failures On
Ford 5.0 & 5.7L (302 & 351W CID) Engines
AERA members have experienced premature crankshaft bearing failures on 5.0 & 5.7L Ford engines.
Investigating these failures disclosed that all of the machined components were on size and the proper tolerances had been achieved. Closer inspection of other engine components revealed a crack in the exhaust crossover passage on the bottom side of the intake manifold.
Exhaust gases entering the crankcase through the crack not only contaminate the engine oil, but the oil itself is super heated to the point where it no longer lubricates resulting in contact between the bearing and the crankshaft journal.
Pressurizing the crankcase with exhaust gases should also overwhelm the PCV system leading to excessive oil consumption or oil in the air cleaner.
For additional information see AERA Technical Bulletins: TB 519 &
SB 146
The AERA Technical Committee
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