Question about 1997 Ford F150 Regular Cab
Your comment of "mainly on take offs on inclines" indicates excessive thrust on the crankshaft. If thrust is excessive it will travel longitudinally under load. This is verified by your other statements of "the crank could be pushed and pulled back and forth" and "the crank main bearing brackets were worn right off". These are not "brackets". One of the main bearings has a large outer flange type surface that acts against a machined surface on the crank to limit "thrust" or longitudinal travel. If the crank is improperly ground then it will quickly wear this bearing surface and present the problem you are describing.
Having been an engine and primarily transmission rebuilder for a number of years I can tell you that their claim of the torque converter "blowing up" and causing this problem is a load of bull.
Have your man carefully examine the crank for machine errors - all journals, but especially at the trust bearing, taking careful measurements and report any evidence of faulty crank to the machine shop responsible.
Every new (rebuilt) crank should always be carefully examined prior to install, bearing journals measured, bearings plasti-gauged, and thrust within limits.
Posted on Jun 23, 2009
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Posted on Jan 02, 2017
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