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CA Crankshaft Rebuild Question
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dfwallis View Drop Down
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Joined: 09 Mar 2023
Location: DFW
Points: 627 		Post Options Post Options   Thanks (0) Thanks(0)   Quote dfwallis Quote  Post ReplyReply Direct Link To This Post Topic: CA Crankshaft Rebuild Question
    Posted: 05 Oct 2023 at 5:39pm
It appears that the "thrust washer" is built into the main bearing edge.  Since we've machined the crankshaft, the edge thickness is no longer sufficient and we need an additional spacer.  Is it common to add these?  I don't find much reference to this in the rebuild info (I see references to separate thrust washers for other models).
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PaulB View Drop Down
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Joined: 12 Sep 2009
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Points: 4727 		Post Options Post Options   Thanks (0) Thanks(0)   Quote PaulB Quote  Post ReplyReply Direct Link To This Post Posted: 05 Oct 2023 at 6:20pm
Your crank grinder did not know what he was doing for an Allis Chalmers crank. The nose surface where the  gear presses on should have been ground off to get the correct clearance. As you haven't assembled anything yet, take it bake and get the job completed correctly.
If it was fun to pull in LOW gear, I could have a John Deere.
Real pullers don't have speed limits.
If you can't make it GO... make it SHINY
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dfwallis View Drop Down
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Points: 627 		Post Options Post Options   Thanks (0) Thanks(0)   Quote dfwallis Quote  Post ReplyReply Direct Link To This Post Posted: 05 Oct 2023 at 6:26pm
Originally posted by PaulB PaulB wrote:

Your crank grinder did not know what he was doing for an Allis Chalmers crank. The nose surface where the  gear presses on should have been ground off to get the correct clearance. As you haven't assembled anything yet, take it bake and get the job completed correctly.

:( not what I was hoping for.  I'm already flying back tomorrow to work on the "completed" crank.  Apparently it was worse condition than I thought.  He had to take more off and provided a spacer to compensate.  But the spacer seems to be insufficient.


Edited by dfwallis - 05 Oct 2023 at 6:30pm
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
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Points: 81065 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 05 Oct 2023 at 7:08pm
Pull the gear back off... mount in the lathe and cut a STEP so it slides on further.. Not uncommon to have .040 - .060 clearance on an "OLD motor... As Paul said, they should have done it at the shop... but may not be familiar with "THIS" motor ?

Proper clearance is about .004- .005 ... a few thousandths bigger is fine.

What kind of clearance do you have without / with your new spacer ?


Edited by steve(ill) - 05 Oct 2023 at 7:10pm
Like them all, but love the "B"s.
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dfwallis View Drop Down
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Points: 627 		Post Options Post Options   Thanks (0) Thanks(0)   Quote dfwallis Quote  Post ReplyReply Direct Link To This Post Posted: 05 Oct 2023 at 8:28pm
Originally posted by steve(ill) steve(ill) wrote:

Pull the gear back off... mount in the lathe and cut a STEP so it slides on further.. Not uncommon to have .040 - .060 clearance on an "OLD motor... As Paul said, they should have done it at the shop... but may not be familiar with "THIS" motor ?

Proper clearance is about .004- .005 ... a few thousandths bigger is fine.

What kind of clearance do you have without / with your new spacer ?

I'm not doing the engine work and it's a little hard to follow the text conversation.  I think he's saying to get within spec (0.001 to 0.005) it needs a total of 24 thousandths spacer or 9 thousandths in addition to the existing 15 thousandths spacer.  This is to keep the gear at the proper distance.   Needs to be same ID/OD as the existing spacer for clearance reasons.  I kind of wish there was room for a proper needle roller bearing. 




Edited by dfwallis - 05 Oct 2023 at 8:35pm
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steve(ill) View Drop Down
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Points: 81065 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 05 Oct 2023 at 9:13pm
I have not heard of installing a Spacer.. You normally machine the end of the crank shaft and then PUSH the gear on  24 thousandths.... You get the same effect by machining a 24 thou recess in the gear and PUSH it back on the shaft.. Yes, it sets .024 inch further in from where it was....... but thats nothing.. 
Like them all, but love the "B"s.
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