| Cadillac Engine >> CRANKSHAFT MAIN BEARING UPDATE ON HT-4100 ENGINES |
Crankshaft Main Bearing Update On
GM 4.1L (252 CID) HT-4100 Engines
Cadillac has updated the design of the main bearings for all 4.1L
(252 CID) HT-4100 engines.
The new bearings feature a slightly bigger wall thickness. The
#5 main bearing has been reduced in length from 1.029 to .982.
This was done to reduce the amount of oil at the rear seal by
providing a channel to direct oil away from the rear seal.
Several aftermarket bearing manufacturers have updated their
inventory to reflect the new Cadillac specifications.
The main bearing oil clearance can only be checked on these
engines with the cylinder heads and intake manifold installed and
torqued to specifications. Bearing oil clearances can differ
greatly between an unassembled and assembled engine. Overall oil
bearing clearance should never exceed .002.
(ITALICS ON)
For additional information see AERA Bulletins: TB 474R, TB 491 &
TB 702
(ITALICS OFF)
The AERA Technical Committee
October 1990 - TB 703
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