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| Saab Engine >> IMPORT ENGINE THRUST BEARING PROBLEMS
Import Engine Bearing Problems
The addition of many aftermarket main bearing sets for import automotive engine applications has caused a frequent complaint that the thrust bearings cannot be installed.
The reason is that in most import engine applications, the flanged bearing length is increased with the undersize of the bearing. This means those grinding the crankshaft must grind the thrust face of the crank to accommodate the increased bearing length and secure proper clearance of the crankshaft end thrust.
A typical example may be found with the 1.5L and 1.7L Saab engine utilizing a common aftermarket main bearing set:
The .010 undersize is .004 oversize length.
The .020 and .030 undersize has a .010 oversize length and
the .040 undersize has a .020 oversize length.
The AERA Technical Committee
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