CA engine rebuild-machine work?
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=209448
Printed Date: 22 Mar 2026 at 1:38pm
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Topic: CA engine rebuild-machine work?
Posted By: J&J
Subject: CA engine rebuild-machine work?
Date Posted: 21 Dec 2025 at 9:03pm
|
couple questions: If the block needs to be decked, do I have to take material off the new sleeves as well? I checked the crankshaft end play with a feeler gage at .041. Is this overly excessive or is this typical wear for an engine that needs an over haul? Will the new thrust bearing take care of it? Should there be this much of a gap between the crank gear and the journal in the pic?  |
Replies:
Posted By: DrAllis
Date Posted: 21 Dec 2025 at 9:11pm
| You typically do NOT deck those old wet-sleeve blocks. Use a good sealer around every water passage hole in the head gasket and re-torque head bolts (cold) after a couple hrs of run time. What you must do when decking is re-cut the sleeve counter bores. Too expensive for my wallet. |
Posted By: im4racin
Date Posted: 22 Dec 2025 at 6:56am
| A good machine shop will cut the counter bore the same amount when decking. The gear is to be tight against the journal. |
Posted By: steve(ill)
Date Posted: 22 Dec 2025 at 8:54am
|
.040 end shake is not abnormal when taking apart a WORN ENGINE....end shake should be more like .003 - .005 inch... You put in the new bearings and see what you get.. If you have to reduce the clearance, you can pull the gear back off and machine a step on the end so it pushes on a few thousandths more.
------------- Like them all, but love the "B"s. |
Posted By: J&J
Date Posted: 22 Dec 2025 at 9:25am
| So the space between the gear and the journal should not be there and mine has walked out. Is it just a matter of the machine shop pressing the gear back against the journal to bring it back to the proper end play? |
Posted By: J&J
Date Posted: 22 Dec 2025 at 10:24am
| I should add- the space between the gear and the journal is .060 |
Posted By: J&J
Date Posted: 22 Dec 2025 at 11:12am
| I guess another question is if the gear is pressed all the way to the journal does it even act as a thrust surface or not? |
Posted By: steve(ill)
Date Posted: 22 Dec 2025 at 1:27pm
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yes, that is the THRUST surface.... originally the gear was pressed on flush against the journal.. That was suppose to give you "about" the right backlash.... Now the tractor is 70 years old and who knows what is worn in that area.. Like i said, push the gear on all the way and see how it fits on the journal.. If too tight, pull the gear and put a shim behind it.. normally they will be too LOOSED, and you pull the gear and under cut a step on the back of the gear so it will move inward .020 - .040 or the required amount... to get a few thous backlash.
------------- Like them all, but love the "B"s. |
Posted By: J&J
Date Posted: 22 Dec 2025 at 5:58pm
| I see what you're saying now, thanks Steve. Thanks to all the responses as well! |