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Minneapolis Moline Tractors Discussion Forum
:

engine suddenly locked/jammed

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jaycoop

06-10-2019 14:31:30




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Hello, Auction purchased a c.1950 MM ZAU, hasn't run in maybe 15 years (sat outside). Pulled plugs and soaked a bit. Motor spun freely, several times as I checked compression (pretty good) and valve action (all operate). Went to spin it again and she won't budge (starter works well, just clunks into the ring gear). Ring gear is good, no missing teeth. I placed a wrench on the crank nut - doesn't budge, locked tight. Note that nothing else has been apart and nothing has fallen into any cavities. What would suddenly prevent rotation of the motor, when just prior to this it spun freely?

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jdacih

06-12-2019 10:47:41




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 Re: engine suddenly locked/jammed in reply to jaycoop, 06-10-2019 14:31:30  
I was working on an R years ago, it would turn over just fine but as we were rolling it over to get it timed it got harder an harder at one spot until it finally locked up. i got it to turn backwards and started tearing into it.It turned out some mice had got up into the engine and filled a port with millet, every time I would turn it over a valve would open and dump millet into the cylinder until it got enough to keep it from going to top dead center.

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jaycoop

06-12-2019 16:21:46




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 Re: engine suddenly locked/jammed in reply to jdacih, 06-12-2019 10:47:41  
That is the best ever possible cause! I've been there and I do think something odd is going on here. Many years ago my dearly departed brother and I were starting a Buda engine in a Huber rowcrop tractor and nuts packed away in the manifold by squirrels came rapid firing out at him as he controlled the carburetor and I hand cranked the motor.



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mmfan55

06-11-2019 17:23:51




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 Re: engine suddenly locked/jammed in reply to jaycoop, 06-10-2019 14:31:30  
With starter off, in neutral, clutch disengaged: try putting a bar into starter hole and into flywheel teeth. Try moving it both directions. If it is stuck tight, may need to check for spun rod or main bearing.



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t.r.k.

06-10-2019 18:56:01




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 Re: engine suddenly locked/jammed in reply to jaycoop, 06-10-2019 14:31:30  
I would take the head off and look inside. Probably some debris fell through a valve into the cylinder and jammed it.
Don't get too rough with it until you find the problem.



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jaycoop

06-11-2019 15:19:51




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 Re: engine suddenly locked/jammed in reply to t.r.k., 06-10-2019 18:56:01  
Thanks much for the additional help and ideas. I pulled the starter and tried turning the engine again in both directions - nothing. I will look into the matter of the head/dislodged debris. To me, it is such solid resistance that I wonder if there isn't something metal in the way. Is it possible that the roller bearing at the front of the engine has fallen apart, causing the jam. I've read elsewhere of this problem with this particular motor, although no one has ever indicated that the bearing completely fell apart....rather they are notorious for failing/becoming noisy/requiring replacement. Also, what about the oil pump or some other device that moves mechanically with the engine?

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swmolines

06-10-2019 17:12:16




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 Re: engine suddenly locked/jammed in reply to jaycoop, 06-10-2019 14:31:30  
Take the clutch cover off and use a bar to rotate it in reverse. Pull the plugs and blow out the cylinders with the pistons near TDC.

You may have carbon falling loose from combustion chamber and or valves.



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mmfan55

06-10-2019 15:45:58




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 Re: engine suddenly locked/jammed in reply to jaycoop, 06-10-2019 14:31:30  
Yes, pull starter off and recheck.



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Ronnie Budd

06-10-2019 14:44:11




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 Re: engine suddenly locked/jammed in reply to jaycoop, 06-10-2019 14:31:30  
Is it still locked with the starter removed? I've seen the starter drive stick due to no lubrication.



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jaycoop

06-10-2019 16:20:17




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 Re: engine suddenly locked/jammed in reply to Ronnie Budd, 06-10-2019 14:44:11  
Thanks for the replies so far.....I will check it again with the starter completely removed.



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Howard H.

06-14-2019 11:09:48




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 Re: engine suddenly locked/jammed in reply to jaycoop, 06-10-2019 16:20:17  

Found anything yet??

Weíve also run into mice storing away milo/corn in an engine.

Also, itís probably a long shot, but I had a mag on a 605 irrigation engine lock down tight enough to shell half the teeth off the cam gear!!!

In other words, sometimes it pays to check other than the main engine itself.

Iíd also throw a vote towards getting a borescope. They arenít too expensive these days. The one I got connects via WiFi to my cell phone and lets me see the pic on the screen and/or take screen captures for reference. Snaking a camera down a plug hole has really helped me a lot on things like that.

Howard

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