301 diesel will only crank 1/4 turn
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=198981
Printed Date: 23 Jun 2024 at 1:56pm
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Topic: 301 diesel will only crank 1/4 turn
Posted By: CCF
Subject: 301 diesel will only crank 1/4 turn
Date Posted: 31 Dec 2023 at 4:09pm
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Gleaner f combine broke hydro pump belt put on new belt used wrench to turn motor to put plate back on that runs unload drive, all back together now will only crank over 1/4 turn exactly that was starter issues but took starter off and with wrench only 1/4 forward or backwards. Before this ran fine moved around the yard let the oldest drive it around sounded good no smoke no nothing. Where should I start, I ordered owners manual but don’t even have it yet Guessing need to take valve cover cover off see if all valves there? Just weird it ran fine shut it off and now this🤦♂️ Thanks for help |
Replies:
Posted By: DrAllis
Date Posted: 31 Dec 2023 at 5:05pm
| Remove every belt from the front and back of the engine and determine if it still is only 1/4 turn or not before you do anything else. |
Posted By: CCF
Date Posted: 31 Dec 2023 at 5:08pm
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I did take main drive belt off and same so I’m going to take hydro pump belt back off tomorrow couldn’t see any thing but going to make sure I’ll post update after it’s off |
Posted By: HudCo
Date Posted: 31 Dec 2023 at 6:54pm
| timing , and compression |
Posted By: SteveM C/IL
Date Posted: 31 Dec 2023 at 10:03pm
| Did you put a long bolt in somewhere that's sticking too far through? |
Posted By: CCF
Date Posted: 31 Dec 2023 at 10:10pm
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I put it back with everything that came out…. So here is what im hoping for. Going along with what Dr Allis said I didn’t look too close at belt when I put new one on old one broke so I’m hoping it’s something with the hydro pump and it burnt the belt off but that will be in the morning. |
Posted By: HudCo
Date Posted: 01 Jan 2024 at 7:48am
| i dont know how my reply got on the wrong post |
Posted By: Tbone95
Date Posted: 01 Jan 2024 at 8:26am
I got $.25 on the hydro having a problem. |
CCF wrote:Posted By: GSTROM99
Date Posted: 01 Jan 2024 at 8:47am
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[/QUOTE] I got $.25 on the hydro having a problem. [/QUOTE] Me too. Probably why belt burnt off...
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Posted By: WF owner
Date Posted: 01 Jan 2024 at 10:46am
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When it stops turning, is it a sudden (clunk) stop or kind of soft / cushioned? Is it possible there is liquid in one (or more) of the cylinders causing hydro lock (cushioned stop)?
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Posted By: CCF
Date Posted: 01 Jan 2024 at 11:28am
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Update All belts off besides fan belt. Still hits and it’s a hard hit using breaker bar on front crank Took exhaust manifold off it’s dry Took hose off intake it dry Took valve cover off all valves appear to be in springs Nothing appears goofy on push rods Valves are moving at rear opposite end of fan and number 2 in quarter turn so don’t think cam. Any ideas things to check I missed? |
Posted By: WF owner
Date Posted: 01 Jan 2024 at 11:42am
| A loose bolt on the flywheel or something floating around in the bellhousing? |
Posted By: CCF
Date Posted: 01 Jan 2024 at 11:46am
| I was on agco parts page looking at taking rear pto shaft off to check in there took starter off can’t see much small holes to look in Going to stick magnet in there also 🤞. I’m not much of engine person so any help greatly appreciated |
Posted By: DrAllis
Date Posted: 01 Jan 2024 at 11:52am
| You may have a rear PTO bearing bad. |
Posted By: CCF
Date Posted: 01 Jan 2024 at 11:53am
That is where I’m heading next |
Posted By: im4racin
Date Posted: 01 Jan 2024 at 9:04pm
| A hydro lock will pass when turned backwards 2 complete turns. That will push it into the intake so look for liquid then |
Posted By: SteveM C/IL
Date Posted: 01 Jan 2024 at 9:32pm
| Reminds me of 40+yrs ago. 6-71 Detroit running fine when parked. Next morning dead miss on one cylinder. Head of piston containing rings broke free of rest and was setting at the top. Firing every stroke kept it together and running till shut down. Some things just happen. |
Posted By: Tbone95
Date Posted: 02 Jan 2024 at 7:34am
I got $.25 on the hydro having a problem. [/QUOTE] Me too. Probably why belt burnt off... [/QUOTE] yep!
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Posted By: CCF
Date Posted: 02 Jan 2024 at 7:36am
Can’t turn it more than quarter turn then hits |
Posted By: CCF
Date Posted: 02 Jan 2024 at 7:37am
Me too. Probably why belt burnt off... [/QUOTE] yep![/QUOTE] Belts off still hit looking into rear pto then motor |
Posted By: Tbone95
Date Posted: 02 Jan 2024 at 7:37am
But….guess not! 
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Posted By: GSTROM99
Date Posted: 02 Jan 2024 at 8:07am
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Posted By: CCF
Date Posted: 02 Jan 2024 at 10:07am
Hoping since when shut off running fine it will not be much if any carnage just replace/reassemble what’s broke 🤞 |
Posted By: WF owner
Date Posted: 02 Jan 2024 at 12:58pm
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I am a firm believer in checking the easy things first. I will go back to SteveM C/IL's question. Are you sure you didn't put a longer bolt in somewhere? It sure sounds like something that rotates is getting caught on something stationary. A long bolt sticking into the bellhousing would be my guess.
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