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Farmall & IHC Tractors Discussion Forum
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42 H new - no compression

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G.V.J.

11-07-2007 15:31:38




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Hey guy`s thanks for your help unfortunately I had already tried all those things including the oil in cyls. it still only brought up to 50lbs.. This is a complete overhaul all to factory specs. new pistons,sleeves rings ,valves guides ,springs,all brgs. inc.cam shaft . Have cked. and valves are closed at T.D.C. have had others ck. my timing and all agree it is timed right both valve and Mag. The head casting no. according to parts manual is right for gas or gas and distallette. My question is what kind of pistons . Flat top or domed . It had flat when I tore it down. What should the compression be on a kerosene engine ?

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Fancy Farm

11-08-2007 12:18:41




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 Re: 42 H new - no compression in reply to G.V.J., 11-07-2007 15:31:38  
You did have the throttle opened up didn't you?



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bcPA

11-08-2007 08:15:17




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 Re: 42 H new - no compression in reply to G.V.J., 11-07-2007 15:31:38  
I would test the valves by locking the engine at top dead center on each piston 1 at a time on the compression stroke and put air into the cylinder and see how long it takes to leak down. With the manifold off and some wd40 squirted in around the valves you will be able to see air bubles there if compression is leaking past the valves. My guess is that the valves are the problem and not the rings unless something was done wrong like oversized liners were used with standard rings.

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GordoSD

11-08-2007 06:15:21




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 Re: 42 H new - no compression in reply to G.V.J., 11-07-2007 15:31:38  
Did you run this engine? Did you break it in with and without a load? What does the exhaust look like?


Gordo



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Scott Rukke

11-07-2007 18:03:57




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 Re: 42 H new - no compression in reply to G.V.J., 11-07-2007 15:31:38  
In my experience with car engines, assuming they're the same, I have found that if you put a teaspoon of oil in each cylinder and then do a compression test and it doesn't change then it's in the valves. It sounds like you did the oil in the cylinders so I have to ask if the valves are adjusted correctly, cam timing OK? etc.



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El Toro

11-07-2007 16:33:07




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 Re: 42 H new - no compression in reply to G.V.J., 11-07-2007 15:31:38  
Hold your hand over the throat of the carburetor
and see if there's good suction on your hand while someone makes an attempt to start the tractor. The hand should be wet with gas too.
Hal



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Nebraska Cowman

11-07-2007 16:03:37




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 Re: 42 H new - no compression in reply to G.V.J., 11-07-2007 15:31:38  
If you have 50 pounds compression it will run. Something else is wrong. I guess timing. I'd squirt some either in the carb intake and see if it fires. That will tell you where the trouble lies.



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Janicholson

11-07-2007 16:03:25




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 Re: 42 H new - no compression in reply to G.V.J., 11-07-2007 15:31:38  
The compression should be 80PSI or so.
something is wrong in this process.
Here is my opinion (I know it may sound redundant, but humor me)
with the plugs out, and valve cover off, use a hand crank, or jack up one rear wheel and use high gear to rotate the engine. Place a stiff 1 foot long piece of copper wire in the #1 plug hole. rotate the engine to be sure it is at TDC (and on the timing mark, and the rotor is pointing to #1 cap terminal).
The valves will now be closed on #1 cylinder Rotate the engine slowly in the correct direction.
The valves will remain closed for 1/2 revolution.
THe exhaust valve will begin to open when the piston begins to go back up.
At the top of the stroke the valves overlap, and both are kinda open (exhaust closing, and intake opening) The TDC mark will go by, and the rotor will now be pointing 180 degrees from the #1 terminal, to the #4 terminal.
Continue to rotate as the piston goes down, the intake will remain closed till about the bottom of the stroke, then it will close (both valves now closed)
Turning farther will bring the piston back up on the compression stroke. Valves will remain closed through this motion. If this is not what is happening, the cam is out of time.
Also:
If you set the valves when the piston is at TDC on compression, they will be correct.
Best of luck, JimN

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G.V.J.

11-07-2007 17:14:44




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 Re: 42 H new - no compression in reply to Janicholson, 11-07-2007 16:03:25  
Hey Fellows Have tried your suggestions but will try again in morn. maybe me and the other guy`s helping me are missing something. Thanks



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old

11-07-2007 18:22:54




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 Re: 42 H new - no compression in reply to G.V.J., 11-07-2007 17:14:44  
You don't by chance have the ring gaps lined up with each other?? If you do the compression will be low. Seen that more then once. I don't know how much or how little you know but I have seen novice put and engine together and line up the gaps in the rings and then they can't figure out why the engine will not run or runs poorly

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