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8N engine seizes

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Roger Gates

03-27-2008 03:19:25




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My next door neighbor has had this tractor a few years and this has been an ongoing problem. After the tractor runs a while, it develops a miss then quits. At taht point the engine appears to be locked. We tried pulling it in 4th gear and it just locks the wheels. If you remove the plugs and add oil and let it sit overnight it will break free and run great again for a while. It has had a head gasket replaced recently on a guess but still same problem. Doesnt overheat and runs 40psi oil pressure. What in the world could be causing this?

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OKDAD

03-27-2008 23:05:50




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 Re: 8N engine seizes in reply to John in Mich, 03-27-2008 03:19:25  
If a cyl was galling I would think you would have little or no compression on that one. Have you done a compression test?



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sgt bull

03-27-2008 21:35:57




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 Re: 8N engine seizes in reply to Roger Gates, 03-27-2008 03:19:25  
has he rerung the engine, and if so, did the problem develop AFTER he rerung it? I had an Allis "B" that exhibited the same problem. Engine would start great, run, warm up, lose power and lock up.... end gap in the rings was too small. Rings heated up, expanded, and became tight in the bore. Engine cooled down, and all was well, until it warmed up again. Had to tear the engine down, file the rings to the proper gap, and never had the problem again.

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Paul Kingsbury

03-27-2008 10:02:50




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 Re: 8N engine seizes in reply to Roger Gates, 03-27-2008 03:19:25  
There are really only two causes. The more likely is a bearing on the crankshaft, next is a cylinder/piston is galling and seizing onto the sides. Either one of these means that all the bearings will be shot, and the crank, and the cam, and, and, and… it will be costly.



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Den N Ms

03-27-2008 07:52:55




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 Re: 8N engine seizes in reply to Roger Gates, 03-27-2008 03:19:25  
Roger,It could be the pistons are gauleded to the cylinder wall.Aluminium stuck on the walls, caused from the liner being distorted out of round or pistons to tight Was the engine turned over and the cylinder walls checked when the head was off?Had it been rebuilt not to long ago?



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Den N Ms

03-27-2008 08:42:29




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 Re: 8N engine seizes in reply to Den N Ms, 03-27-2008 07:52:55  
Roger Gates

03-27-2008 06:00:17
71.228.205.93
653788



Re: 8N engine seizes in reply to soundguy, 03-27-2008 05:51:54 Rodger, you said Yes still seized but this morning it turns over. Ive never seen anything like this

Rodger, You might try starting it again and just running it a short while ,shut it off before it sizeses up,let it cool down and restart.By doing this several times it might free it up to where it would run and not sieze.If so then change the oil and filter.It might be worth a try.

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Roger Gates

03-27-2008 07:59:35




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 Re: 8N engine seizes in reply to Den N Ms, 03-27-2008 07:52:55  
Thanks for the reply Den, I think you may be on to something there. Not sure about the engine rebuild but if it got one its been a while. The ead was off 2 years ago and the tractor hasnt been run much since, just started every now and then, but the head gasket was all that was done and it was done due to this recurring problem but didnt seem to have any effect on the problem. It never loses any antifreeze and doesnt smoke so I think the head is ok. But I think your right on with the liner/piston problem. Thanks again and Ill pass the tip along

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TheOldHokie

03-27-2008 08:06:47




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 Re: 8N engine seizes in reply to Roger Gates, 03-27-2008 07:59:35  
If there's that kind of metal to metal galling I'd think you'd find evidence of it in the oil - metal bits. I guess I assumed too much when you said the head had been removed as part of the diagnostics to date....

TOH



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TheOldHokie

03-27-2008 06:22:15




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 Re: 8N engine seizes in reply to Roger Gates, 03-27-2008 03:19:25  

Roger Gates said: (quoted from post at 03:19:25 03/27/08) My next door neighbor has had this tractor a few years and this has been an ongoing problem. After the tractor runs a while, it develops a miss then quits. At taht point the engine appears to be locked. We tried pulling it in 4th gear and it just locks the wheels. If you remove the plugs and add oil and let it sit overnight it will break free and run great again for a while. It has had a head gasket replaced recently on a guess but still same problem. Doesnt overheat and runs 40psi oil pressure. What in the world could be causing this?


Check the starter drive - possibly hanging up on the ring gear and causing some sort of weird binding?

Bewilderingly yours,

TOH, Grasper of Straws

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Dunk

03-27-2008 06:15:59




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 Re: 8N engine seizes in reply to Roger Gates, 03-27-2008 03:19:25  
I know this is kind of elementary, but are we sure there is no water in the oil?



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Roger Gates

03-27-2008 08:03:38




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 Re: 8N engine seizes in reply to Dunk, 03-27-2008 06:15:59  
No water in the oil, hey at this point thats not elemntary. I thought I was losing my mind on this deal and I do appreciate the tip. I think Den is right about the piston/sleeve problem. Just about has to be that, no engine noise when it does run.



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soundguy

03-27-2008 05:51:54




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 Re: 8N engine seizes in reply to Roger Gates, 03-27-2008 03:19:25  
When it locks, if you pull the plugs.. is it still siezed?

soundguy



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Roger Gates

03-27-2008 06:00:17




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 Re: 8N engine seizes in reply to soundguy, 03-27-2008 05:51:54  
Yes still seized but this morning it turns over. Ive never seen anything like this



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soundguy

03-27-2008 06:10:37




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 Re: 8N engine seizes in reply to Roger Gates, 03-27-2008 06:00:17  
If it is the enginethat is siezed, and not the drivetrain.. I think I'd be pulling the pan and looking at the crank and bearings... that's about the only thing i can see siezing the engine with the plugs out...

soundguy



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Herman, MN.

03-27-2008 09:51:46




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 Re: 8N engine seizes in reply to soundguy, 03-27-2008 06:10:37  
Reading soundguys comment about looking at the crank and bearings, the thought occurred to me that maybe it is the crank and bearing or even connecting rods, maybe one of them has to small of a oil clearance and that particular problem would result in excessive heating, thus causing expansion of the metal to the point that it seizes between the two, and after awhile of cooling it contracts, and thus runs again. Just a thought, what do you think soundguy.

Joel

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soundguy

03-27-2008 10:51:46




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 Re: 8N engine seizes in reply to Herman, MN., 03-27-2008 09:51:46  
Yep...

soundguy



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Bruce (VA)

03-27-2008 06:06:25




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 Re: 8N engine seizes in reply to Roger Gates, 03-27-2008 06:00:17  
Well, you just lost me. Is the engine or the drive train seized? If the engine is seized, it will not turn over. If the drive train (clutch, tranny, etc) is seized, the engine will turn w/ the clutch disengaged.



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Roger Gates

03-27-2008 06:12:13




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 Re: 8N engine seizes in reply to Bruce (VA), 03-27-2008 06:06:25  
Its the engine thts seized, you cant turn it over at all, by hand with a large wrench on the crank pulley while the trans is in nuetral. Im not a tractor mechanic, but I am a technician for Ford, its the craziest thing Ive ever heard of. Didnt even believe my neighbor until this morning, after I saw it lock up yesterday and start this morning. Not familiar with flat heads but could it be a valve or someting?

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