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1942 H

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G.V.J.

11-06-2007 13:46:56




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Guy`s I `am stumped!! I rebuilt a 42 H complete everything new went to start would not start so checked valve timing and mag. timing over and over again still nothing got spark and fuel so checked compression and only 40 lbs. ?? How could this be?? It is a gas and disltate . Why would the comp. be so low?? THANKS FOR YOUR HELP!! G.V.J.

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El Toro

11-07-2007 08:31:55




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 Re: 1942 H in reply to G.V.J., 11-06-2007 13:46:56  
You need to bring No1 piston near the radiator to TDC on the compression stroke. Remove No1 sparkplug and hand crank the engine until you compression against your thumb drop a large handle screwdriver on top of the piston and watch the piston rise until it stops. Your timing marks should be aligned, rotor should point to No1 plug tower and both valves should be closed.

Did you install new sleeves, pistons and rings? If you only installed new rings and didn't measure the ring gap when the rings are pushed down in the old sleeves could be the reason for low compression. The sleeves may be worn. Set the valve lash to .020" cold to make sure they have enough clearance. Hal

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gene bender

11-07-2007 02:26:22




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 Re: 1942 H in reply to G.V.J., 11-06-2007 13:46:56  
You say the mag is timed are you sure the rotor is pointed at the tower on the cap when it impulses. You can have fire to the plug but that doesent mean the fire gets to the plug when piston is TDC. Are you sure the timing marks are correct cause if you are out then the compression would be low or is your guage bad.40 seems like awful low reading especially with new rings. I would remove all plugs. Turn engine over till piston is on top TDC then check iff both valves are closed. Do this on all 4 cycls to double check. Hope this helps

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D Slater

11-06-2007 16:06:42




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 Re: 1942 H in reply to G.V.J., 11-06-2007 13:46:56  
Did you check compression with throttle closed or wide open? Did you have the timing gears removed? If so camshaft could be out of time with crankshaft. Also could the valves be adjusted to tight. Did you stager the ring gaps? Were the pistons replaced? Probably didn't happen, but there's a outside chance the pistons could have been manufactured with the wrong compression height. Also check to see if spark plugs are getting wet.

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Rodman

11-06-2007 15:51:05




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 Re: 1942 H in reply to G.V.J., 11-06-2007 13:46:56  
Years ago I rebuilt an engine and could not get the thing to start even with pulling it. Stopped at a country service station and garage and asked the fellow there. He gave me an oil can and squirt about three squirts into each cylinder, and crank it over. It turned over about 5 times and fired right off. I felt stupid and very please at the same time. Don't know if this is your problem, but I learned something then that I have never forgotten. By the way that engine had been bored and new pistons that had been dipped in oil before being installed, but it had apparently drained down enough that I wasn't getting good compression.

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Pat-CT

11-06-2007 15:09:32




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 Re: 1942 H in reply to G.V.J., 11-06-2007 13:46:56  
are you sure you put the rings on right



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Andy Motteberg

11-06-2007 14:31:47




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 Re: 1942 H in reply to G.V.J., 11-06-2007 13:46:56  
After you add a little oil in the cylinders, put some gasoline in each cylinder and try starting it. If it runs or almost starts for a short time, it may not be getting the gas.



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Andy Motteberg

11-06-2007 14:30:16




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 Re: 1942 H in reply to G.V.J., 11-06-2007 13:46:56  
If you put in new pistons or rings, you may need to put a small amount of engine oil in each cylinder and slowly crank the engine a few times.

Good luck



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Mike CA

11-06-2007 14:23:45




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 Re: 1942 H in reply to G.V.J., 11-06-2007 13:46:56  
What did you do to the pistons and sleeves for the rebuild? It's my understanding that low compression means bad or stuck rings. The owners manual says add 2 tablespoons of an oil/gas mix to help the rings seat. But I don't want to suggest that because I honestly don't know squat about engines.



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