CA Crankshaft Rebuild Question
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=197545
Printed Date: 25 Sep 2024 at 1:27am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: CA Crankshaft Rebuild Question
Posted By: dfwallis
Subject: CA Crankshaft Rebuild Question
Date 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). |
Replies:
Posted By: PaulB
Date Posted: 05 Oct 2023 at 6:20pm
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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 |
Posted By: dfwallis
Date Posted: 05 Oct 2023 at 6:26pm
:( 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.
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PaulB wrote:Posted By: steve(ill)
Date Posted: 05 Oct 2023 at 7:08pm
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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 ?
------------- Like them all, but love the "B"s. |
Posted By: dfwallis
Date Posted: 05 Oct 2023 at 8:28pm
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. |
Posted By: steve(ill)
Date Posted: 05 Oct 2023 at 9:13pm
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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. |