CA Crankshaft
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=198575
Printed Date: 16 May 2025 at 8:53am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: CA Crankshaft
Posted By: KChallener
Subject: CA Crankshaft
Date Posted: 06 Dec 2023 at 1:04pm
|
My newly acquired CA has a bent crankshaft. I have searched all the websites I can find to no avail. Anyone have a suggestion or know where I might find one? Thanks, Ken |
Replies:
Posted By: PaulB
Date Posted: 06 Dec 2023 at 3:06pm
|
I have plenty of them, although I'm in Maryland very near Gettysburg, Pa. I'm sure if you call Branda at Sandy Lake Implement, they'll have something for you. 724-376-2489 Sandy Lake Implement is right in you area. ------------- 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: Mikez
Date Posted: 06 Dec 2023 at 5:13pm
| I sent you a private message |
Posted By: dfwallis
Date Posted: 06 Dec 2023 at 7:25pm
| How does a crankshaft typically get bent?? They're pretty beefy. |
Posted By: Codger
Date Posted: 06 Dec 2023 at 7:37pm
|
The torsional "twist" imparted through them with clutch engagement having a heavy load to pull. When you set the shaft up on blocks and rotate it using an indicator on a round bearing surface this minor twist results in the shaft "heaving" which is interpreted as bending. They don't bend as such like folding apiece of metal over in a bench vise.
------------- That's All Folks! |
Posted By: jdeere562
Date Posted: 06 Dec 2023 at 11:24pm
I bent one once in a WC pulling tractor. But had beefed up the engine some. Put in a WD45 crank and rods for more stroke. Had some 4020 JD sleeves machined for the block and 454 big block Chevy pistons as I recall. Also reworked and ported the cylinder head, intake and exhaust. Ran a D19 carb, had to drill jets to get it running properly. Always wanted to hide a nitrous bottle somewhere...LOL! It would normally spit out the PTO gearbox on the dyno, before you could get a HP reading. Been a lot of years ago.
|
dfwallis wrote:Posted By: Lon(MN)
Date Posted: 07 Dec 2023 at 4:58am
|
I have several, but a little ways away. ------------- http://lonsallischalmers.com |
Posted By: DrAllis
Date Posted: 07 Dec 2023 at 5:23am
| I'm still trying to figure out how a "CA" engine would ever have enough BANG in the combustion chamber to bent a crankshaft ?? Must be a bearing burn out related failure ???? |
Posted By: KChallener
Date Posted: 08 Dec 2023 at 4:55am
|
Thanks for all the comments. I will call SLE (Sandy Lake). It looks like the A, C, and CA cranks were all the same? Pull the crank, mains, etc. Rod bearings were burn and scored. My guess is that there was a main failure at sometime, probably number one. Someone's been in there before, lots of Permatex. Before dissassebly I was getting about 45 psi compression on all 4 - any thoughts on that? Ken |
Posted By: WF owner
Date Posted: 08 Dec 2023 at 5:55am
| B, C and CA are all the same. A is an entirely different, and significantly bigger engine. |
Posted By: DrAllis
Date Posted: 08 Dec 2023 at 6:07am
| 45 psi cranking with an electric starter spinning the engine ?? Pretty poor. Double that would be much better. |
Posted By: Les Kerf
Date Posted: 08 Dec 2023 at 7:26pm
Better check cam timing, that's mighty even for being simply worn.
|
Posted By: KChallener
Date Posted: 09 Dec 2023 at 6:23am
|
THanks. Will check pressures again after new pistons, sleeves, rings, crank and bearings. Ken |