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Farmall & IHC Tractors Discussion Forum
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H Compression Loss

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IndianaRed

07-05-2006 11:43:43




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Well, crud. Put my H back together and when she started up I was pretty please with myself. She was missing some but figured it just wasn't timed right. Pulled spark plugs and did just a simple finger compression test and #1 is way bad. I get both compressions, but very weak. Along with the slight coolant leak I noticed at bottom front of block when oil pan was out while I was putting new piston and rod bearings in, and the small amount of water already in oil after just an hour or so running, I'm no longer very pleased with myself. Must have a crack but don't know where. Have read tons of posts here trying to find common areas, and guess it could be anywhere. #1 had a really bad piston, half gone, that I replaced. Sleeve looked ok to my untrained eye. Head looked good after I cleaned it up, no cracks that I could see by looking real hard. Can't afford yet to magnaflux. New head gasket set installed. Had difficulty with one head bolts not having enough bolt to grap onto and knew I would have to take head off again and fix that, but surely that can't be doing all this. I flipped the bolt upside down, (I know, I know) and got it to grab and torque to 70. When running now no smoke at all, white, blue, or black, just big miss. As low as the compression seems to be on my finger, must be pretty bad. Want to at least try to JB weld, if I could find the crack. Guess I should open water panels and look in at cylinder walls? Started to early on just to check, and the very first bolt head came right off with not much pressure turning it at all. Have since read that's not uncommon, so that could just be opening another can of worms. I'm not gonna give up on her, as poor as I am. I'll bring this old iron back one way or another, just may be next decade before I'm done! Any tips on finding this crack would surely be appreciated. Would be difficult to pull block with my limited shop and tools.

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Janicholson

07-05-2006 16:56:22




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 Re: H Compression Loss in reply to IndianaRed, 07-05-2006 11:43:43  
Every effort you make, no matter how others see it, is an effort of intent. Sense you are not intending to ruin anything, I applaud your effort. Make (using an old sparkplug that fits the engine with the insulator smashed out of it and an air hose fitting brazed in), or buy an adapter to put air pressure in the cylinder. Take the rockers loose on that cylinder and, with it in neutral, put air pressurt in the cylinder. Even 150 psi won't hurt anything, it gets that and way more running. about 50 psi is minimum. Then listen with a 1/4" rubber hose held close to your ear, and the other end searching for the escape of air. Crank case at the oil fill hole, air intake at the carb, exhaust at muffler/pipe/manifold if no muffler. and look in the radiator for bubbles. This leakdown test is a sure way to find a compression leak as bad as you describe.
Also make sure the valves are all the way seated on the cylinder in question, sometimes they get a piece of crud under them and get held open. Lots of air in the intake at the carb, or air at the exhaust. Good luck finding the problem. JimN

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IndianaRed

07-05-2006 17:03:31




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 Re: H Compression Loss in reply to Janicholson, 07-05-2006 16:56:22  
Thanks a bunch Jim



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Janicholson

07-05-2006 17:10:11




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 Re: H Compression Loss in reply to IndianaRed, 07-05-2006 17:03:31  
You are welcome.



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Nat 2

07-05-2006 13:58:01




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 Re: H Compression Loss in reply to IndianaRed, 07-05-2006 11:43:43  
Let me get this straight... You had an obvious coolant leak into the oil pan, yet you did nothing to troubleshoot and repair the problem while you had the engine apart?

If the #1 piston was "half gone" the sleeve is shot. That's probably why you have no compression. See, your untrained eye, and even trained eyes with decades of experience, need precision measuring tools to determine if a sleeve is good or not. Just a few thousandths too large, or out-of-round, and the air just leaks through into the crankcase. Your eye can't measure that fine.

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IndianaRed

07-05-2006 15:42:55




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 Re: H Compression Loss in reply to Nat 2, 07-05-2006 13:58:01  
Yep, that's what I did, or didn't do. Pretty much an idiot trying to do something I shouldn't be I guess.



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RustyFarmall

07-05-2006 13:30:12




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 Re: H Compression Loss in reply to IndianaRed, 07-05-2006 11:43:43  
If I am reading this right, you turned one of the head bolt studs upside down? Those studs are course threaded on the end that goes into the block, and fine threaded on the top end, where the nut goes.



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IndianaRed

07-05-2006 12:27:14




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 Re: H Compression Loss in reply to IndianaRed, 07-05-2006 11:43:43  
Also, #1 plug is wet with gas. Is this related to low compression? It does have good blue spark to it.



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Andy Martin

07-05-2006 12:44:44




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 Re: H Compression Loss in reply to IndianaRed, 07-05-2006 12:27:14  
Wet with gas and good blue spark don't go together.

Do you have compression bubbles in the radiator?

A coolant leak will not necessarily cause a miss, so you may have two problems.

I'm sure you've backed the rockers off to make sure you don't have a valve leak. Did you grind the valves?

I've had good luck with Bars Leaks when it is not a compression leak.



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IndianaRed

07-05-2006 13:59:31




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 Re: H Compression Loss in reply to Andy Martin, 07-05-2006 12:44:44  
That's what I thought, this just doesn't make sense. Even with some/a lot of compression loss, if it's firing, it should burn whatever is there, right?



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Tom Windsor

07-05-2006 12:56:06




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 Re: H Compression Loss in reply to Andy Martin, 07-05-2006 12:44:44  
Something here does not add up. Fill this thing up with water to the tip top...and as suggested...see if bubbles come to the top...



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IndianaRed

07-05-2006 14:02:44




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 Re: H Compression Loss in reply to Tom Windsor, 07-05-2006 12:56:06  
Thanks Tom, going out to do that right now. Although I did put some stop leak stuff that said it would seal cracks, it was copperish stuff, most expensive in the store, and didn't notice any bubbles as I went through flushing, filling, flushing. But maybe I wasn't looking closely enough.

Be back in a few.



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