The Ford Barn - View Single Post - OK! Oldtimers, Gimme your best answer, Stuck Engine

Terry Burtz, Calif · 01-18-2019, 11:32 PM

With the conversion to inserts, separate thrust bearings are needed. This is modern engine design practice.

These thrust bearings are in the form of 2 half circles that are not rigidly attached, but need to have an anti-rotation feature.

My guess for the cause of your locked engine is that you have a thrust bearing problem where the thrust bearing has climbed out of its anti-rotation feature, and as a result, your crankshaft rear main bearing thrust is bound up.

Many machine shops that do the conversion for inserts use a round head screw that is screwed into the cylinder block and a corresponding hole in the thrust bearing half to prevent thrust bearing rotation. A much better choice would be to use a fillister head or socket head screw with a slightly larger hole in the thrust bearing half.

01-18-2019, 11:32 PM	#33
Terry Burtz, Calif Senior Member Join Date: May 2010 Location: Campbell,CA, USA Posts: 319	Re: OK! Oldtimers, Gimme your best answer, Stuck Engine With the conversion to inserts, separate thrust bearings are needed. This is modern engine design practice. These thrust bearings are in the form of 2 half circles that are not rigidly attached, but need to have an anti-rotation feature. My guess for the cause of your locked engine is that you have a thrust bearing problem where the thrust bearing has climbed out of its anti-rotation feature, and as a result, your crankshaft rear main bearing thrust is bound up. Many machine shops that do the conversion for inserts use a round head screw that is screwed into the cylinder block and a corresponding hole in the thrust bearing half to prevent thrust bearing rotation. A much better choice would be to use a fillister head or socket head screw with a slightly larger hole in the thrust bearing half.