Sad Day with AC190xt
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=55595
Printed Date: 09 Sep 2025 at 7:36am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Sad Day with AC190xt
Posted By: NC Bruce
Subject: Sad Day with AC190xt
Date Posted: 20 Aug 2012 at 9:35pm
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My son John was bush hogging(10ft) with his favorite, AC190xtIII ( with less than 200 hrs on rebuilt engine), when the CrankShaft BROKE ! ( it would still run ) We pushed it into shop, and only pulled the pan to see break at #2 from front. John is heartbroken and trying to consider his options? He hates idea of not fixing his engine... (using his fairly new parts). But it might be easier / expense, to find a good 2900 turbo engine to just bolt in...but what's chances / cost of finding that somewhere? What model tractors / combines had the 301 engine? What suggestions do ya'll have? thanx for any help?  Bruce in North Carolina |
Replies:
Posted By: Burgie
Date Posted: 21 Aug 2012 at 6:20am
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I have a 301 out of a M combine. $1500 ------------- "Burgie" |
Posted By: Lonn
Date Posted: 21 Aug 2012 at 6:23am
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Did you have the crankshaft ground? If so was it ground correctly? They ain't as tolerant as a crank out of say a WD. ------------- -- --- .... .- -- -- .- -.. / .-- .- ... / .- / -- ..- .-. -.. . .-. .. -. --. / -.-. .... .. .-.. -.. / .-. .- .--. .. ... - Wink I am a Russian Bot |
Posted By: JPG AUSTRALIA
Date Posted: 21 Aug 2012 at 9:04am
| get another crank,you have to take out the motor either way you go,and it wont take much longer to change cranks as running around after another motor which will still need work when you get it(second hand motors are never perfect)like fixing oil leaks,or changin over your fuel pump ect. |
Posted By: DanWi
Date Posted: 21 Aug 2012 at 10:12am
| Long time ago I bought one with a broken crank at an auction, didn't know it at the time but I saw a guy a week or so after the auction that knew I bought the tractor and he told me to check out the front pulley as it looked like it was loose, turned out crank was broke right toward the front, tractor ran ok,I drove it home about 25 miles. I ended up just changing the crank, took the engine out tipped it over and put new used one in, you just have to turn it right to get through the front plate if you don't take it off. |
Posted By: Dean(IA)
Date Posted: 21 Aug 2012 at 10:39am
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If a crankshaft for a 301 is ground, the ends of the bearing journal must have a radius, rather than a square edge where the grind stops. It a radius is not formed, the sharp edge will cause a stress riser and a crack and break will soon happen. This crank also must be shot peened after grinding to also help eliminate stress on the crankshaft. I THINK I have this stated correctly, so HTH |
Posted By: Hurst
Date Posted: 21 Aug 2012 at 10:49am
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If you reuse the block, you may need to have it align-bored. I have always heard that is the correct way to fix a block that had a broken crank, maybe someone else can comment if it's necessary for these engines?
Hurst ------------- 1979 Allis Chalmers 7000 5800 Hours |
Posted By: ctbowles58
Date Posted: 21 Aug 2012 at 12:02pm
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Dont feel to bad i had mine overalled about 20yrs ago and ran it about 20hrs and a new rod broke and went through the block, so i was sick , and i pulled it off behind the barn and there it set for 2yrs, then one day i was at a salvage yard and found a engine for $650 i brought it home and took the 5 new pistons and sleaves out of the ond engine and and picked the best piston of the salvage yard engine and put new rings on it and put it togather and that was 20yrs ago and its still running, so dont feel to bad its happend to me to..good luck. ------------- 190XT 2WD45 WF D15 D14 CA BIG10 302 & 303 bailers 77G rake 80R mower 6 plows and alot more |
Posted By: NC Bruce
Date Posted: 21 Aug 2012 at 10:22pm
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Wow, thanx for the suggestions and stories. Good to hear from others! Our mechanic thought these 301 engines had lots of Crankshaft problems. But, we don't remember reading on this AC web site for many years, any major weaknesses with them. Nothing like the 3rd gear problems? Do ya'll know any problems? Would a slightly leaking front main seal, (when running warm or hard plowing) have been a warning to us? thanx fellows!
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Posted By: Lonn
Date Posted: 22 Aug 2012 at 6:31am
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The 301 was one of the best engines built in it's era IMO. The cranks are fussy when they are reground. They gotta be done right. Little hard starting is the only complaints I can remember back when I worked a few years at an Allis dealer. Not as hard starting as an equivalent Deere. I always heard that the french forged blocks had more cavitation problems and that seems correct to me as the only ones I ever saw with pin holes in the sleeves in the 4 years I worked at the Allis dealer were the engines with the word France cast onto the side of the block. ------------- -- --- .... .- -- -- .- -.. / .-- .- ... / .- / -- ..- .-. -.. . .-. .. -. --. / -.-. .... .. .-.. -.. / .-. .- .--. .. ... - Wink I am a Russian Bot |
Posted By: 427435
Date Posted: 22 Aug 2012 at 10:41am
Your mechanic screwed up and is now blowing smoke to cover his trail. Ask him if he shot peened it after grinding. And when you get the engine apart, look to see if he ground a radius at the edges of the reground crank journals and look for signs of shot peening. ------------- Mark B10 Allis, 917 Allis, 7116 Simplicity, 7790 Simplicity Diesel, GTH-L Simplicity Ignorance is curable-----stupidity is not. |
NC Bruce wrote: