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Farmall & IHC Tractors Discussion Forum
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Farmall M Compression

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Bart

06-17-2004 01:29:44




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Have a 1944 M that was starting and running good. On one startup it backfired and won't start since. Checked points, ok, timing set close. but then checked compression and none on any cylinder.It turns over like mad but won't fire. checked plugs and coil and they are hot. Any advice out there? I haven't got a clue on this. Thanks for any help. Dick in Vermont.




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El Toro

06-17-2004 18:04:05




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 Re: Farmall M Compression in reply to Bart, 06-17-2004 01:29:44  
Hi Bart, I think JT may have found the problem.
The easiest thing to is pull the valve cover and see if the rocker arms move. I doubt if a metal timing gear stripped. GM had that problem years
ago using fiber timing gears and when they failed the push rods usually were bent.

You can probably get a good used cam
by advertising on here, since there is a lot of response on M Farmalls. Hal

PS: Ford even used plastic timing gears for a number of years. Suppose to run quieter.

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JT

06-17-2004 08:47:24




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 Re: Farmall M Compression in reply to Bart, 06-17-2004 01:29:44  
Does the tractor have a engine mounted Hyd pump?

IH had a problem with their camshafts. Originally the nut that held the gear on was right hand thread. worked great when the cam and Dist was all it drove. When a hyp pump was added there was enough stress put on the drive that caused the nut to start to come loose and would eventually cause the end of the cam to break.

The symptoms whan this happens is you will have spark (The gear is still there and drives the distributor). What you don't have is valve action or compression. Pull the valve cover and spin the motor over. If the rockers don't move this is the problem.

Here is the kicker. IH has a update to the camshaft (left hand nut) which is supposed to cure the problem. Last time I checked the cam alone was $500 plus all the other parts etc.

HTH

JT

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Richard Fazio

06-17-2004 05:56:48




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 Re: Farmall M Compression in reply to Bart, 06-17-2004 01:29:44  
Sounds to me like the timing gear for sure. It may have skipped a tooth or two. Pull the cover off the distributor and see if it turns when you crank the engine. If it doesn't turn there's your problem. If it does turn you may still be off timing. When I say timing I mean CAM timing not ignition. Like jed said pull the valve cover and see if the valves are in the proper position when at TDC for number 1 cylinder. Post back if you need more info.

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Jed

06-17-2004 05:31:34




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 Re: Farmall M Compression in reply to Bart, 06-17-2004 01:29:44  
When you say plugs are hot, what does that mean? A fairly common problem with M's is that the timimg gear will break. If the plugs are firing though, that isn't the problem. Pull the valve cover and check valves to see what is happening there.



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BEL@IN

06-17-2004 04:28:13




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 Re: Farmall M Compression in reply to Bart, 06-17-2004 01:29:44  
Are you sure the crankshaft is turning? Hope the backfire didn`t break it. I have never heard of no compression on any cylinder if the engine is turning, Never heard of a broken crank either but I`m sure there some. Good Luck.



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Randy in NE

06-17-2004 04:25:41




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 Re: Farmall M Compression in reply to Bart, 06-17-2004 01:29:44  
The only thing that would cause NO compression would be if all four cylinders lost physical integrity at the same time. This would be like if a valve is stuck open on every cylinder. Or all of the rings broke somehow. Or you have a massive crack in the head or block. I highly doubt any of these scenerios. I would verify the compression tester on another vehicle. Are you getting a good seal around the spark plug hole when you are testing? Are you turning it over several times to make sure you are getting a good test? Even if the camshaft quit turning you are going to get some compression on at least one of the cylinders because you can not physically get a valve open on all 4 cylinders at one time unless something drastic has happened on the top end of the motor.

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Allan in NE

06-17-2004 05:57:52




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 Re: Re: Farmall M Compression in reply to Randy in NE, 06-17-2004 04:25:41  
Hi Ya Randy,

Boy, I dunno.... I don't think that is so.

Ever work on an engine with a broken timing belt?

They will crank all day long with 0 compression on all holes. Nothing in, nothing to compress (or very little, anyway).

This engine "backfired" and then will not start & now shows 0 compression everywhere. If the gauge is indeed okay, I think we have a timing gear problem or some such thing.

As always this is just my view,

Allan

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