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Allis B 125 rod bearing clearances

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rellis73 View Drop Down
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Joined: 31 Dec 2011
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Post Options Post Options   Thanks (0) Thanks(0)   Quote rellis73 Quote  Post ReplyReply Direct Link To This Post Topic: Allis B 125 rod bearing clearances
    Posted: 13 Aug 2012 at 12:07pm
Hey all!  Ya'll have been a huge help in the past so I hope you can help again.  We are trying to put the motor back together for the B and are having binding problems with the rod bearings.  It would appear that on 2 out of the 4 sets of bearing shells there is a lip of about 1/32"  where the shell sticks above the rod cap.  The other side of the same bearing however does not come up short that 1/32" so when you put the rod together we are having a crushing problem where the shells come together which in turn is causing a binding problem on the crank.  I guess my question is: Is this normal or something that someone else has run into and can be taken care of with the shims under the rod caps.  We did plastigauge the rods when we put them together and got the correct clearance under the bearing but obviously have too much crush as evidenced by the binding.  Anyone have any suggestions?
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Hartland Farm View Drop Down
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Joined: 13 Sep 2009
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Hartland Farm Quote  Post ReplyReply Direct Link To This Post Posted: 13 Aug 2012 at 1:24pm
Yes get a manual. The clearance is .002 and is gotten by shimming. Those are crush type bearing to dispence heat. Get a manual. Joe
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rellis73 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote rellis73 Quote  Post ReplyReply Direct Link To This Post Posted: 22 Aug 2012 at 10:02am
Thanks for the response.  I have a manual and knew that the tolerances were between .001-.003 for the rod bearings but the problem was that #4 piston rod and cap was the only one were the protrusion of the bearing shell was about .015 - .020 above the cap.  I also knew that shaving the end of the bearing shell was going to cause other problems; short and long range.  After making new shims out of brass stock and adjusting, testing, adjusting, testing, adjusting, testing I got the clearance where it should be and maintained the correct crush on the bearing shell and she purrs like a kitten without the dreaded rod ping. Thanks again!
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