thrust bearing oversized??

[NC87GN]

I got word back, from my machinist, that my crank end play on my used standard high mileage TR crank is out of spec .012". I am the process of a second rebuild and purchased a used standard crank from a reputable list member. I had two center billet caps machined and installed and purchased 0.010" federal mogul performance wide bearings. My first question is are these bearings oversized for just the crank journals only? Do I need to specify I need 0.010" more on the thrust bearing surface as well? If so were is a good source to purchase a .010" bearing with the thrust oversized to .010"??

TIA
Mike Banas
87GN

 

[Tim Cucci]

Clevite 77 was the only oversize bearing set I could find with the longer flange bearing to correct endplay. I believe it comes in a .010, .020, and .040. extra length. They are also in .010 and .020 oversize for turned cranks. Check the NAPA web site. I think Clevite is the only one that makes the oversized length thrust bearing? It has worked very well for me. Not a patch but a fix per my machinist.

 

[chris]

What did you do to fix this?

 

[NC87GN]

Tom Cucci is 100% correct. Went to NAPA and placed a special order for these bearings. I then told the machinist what I was buying and he wanted to wait till I get the bearing to him to cut the crank for .004" to .005" of endplay. Take it to a "reputable" machine shop because you must grind then take measurements repeatedly to get everything centered. You DO NOT just grind the thrust on one side of the crank and slap it in to get your clearances. Both sides need to be identical to center up the bearing as I was told. HTH

Mike Banas
87GN

 

[Tim Cucci]

My machinist did the same thing. He would not touch the crank until I he had the bearing in hand. He had to grind each thrust face to keep the crank centered. He did tell me which length bearing he thought I should order. he knew about what it would take to clean up the thrust faces on the crank.
A good machinist is a must. It has worked great for me. My endplay was a tight .004" when I installed it and then checked it a couple months later and still .004". Have not checked lately over a year and 5000 miles ago.

Tim