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Model B Compression

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apme

02-09-2007 18:12:17




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I just picked up an allis chalmers B and I was trying to start it. It would not start so I started checking thing....have good spark, have fuel...so I did the next thing check the compression.
How much compression should a B have? I put the tester on it and I have no compression in all four cylinders. The valves are coming all the way up. Why would I have no compression in all of the cylinders? Thanks

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apme

02-11-2007 10:53:36




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 Re: Model B Compression in reply to apme, 02-09-2007 18:12:17  
Thank you for the help. It looks like that was the problem. I have compression in the cylinders now. I still need to check and see how much. I have never scene that one before. Thank you.



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Dick L

02-11-2007 06:58:57




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 Same Discussion Back in reply to apme, 02-09-2007 18:12:17  
Seems it was a year and a half or so. Could have been longer. I bought a tractor a coupla years before and at the time I bought it I checked it out and it had no compression. It had been sitting out back and when the discussion came up I pulled it down and took pictures and posted what I found.
Valve seats and valves were pitted and the rings were stuck in the pistons. It was obvious that it had been stuck and someone had made it free with the old oil in the cylinders trick but the rings remained fast in the pistons.
It is like preaching to the quire. Those that have been there say yup BTBT. Those that have not (Been There Done That) BTDT still look for the magic potion that will give them an overhaul from a can.

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BDT in Minnesota

02-10-2007 01:55:36




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 Re: Model B Compression in reply to apme, 02-09-2007 18:12:17  
You stated no compression,,,,, ,whatsoever????You may want to check that compression gauge on a good working engine... To have absolutely nothing on all four cylinders??,,,well, I would check the check valve in the gauge first thing.. Let us know what ya find....



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apme

02-10-2007 10:10:44




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 Re: Model B Compression in reply to BDT in Minnesota, 02-10-2007 01:55:36  
I thought the same thing..so I did test it on another one of my tractors and it works perfectly good.



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JMS/MN

02-09-2007 22:34:24




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 Re: Model B Compression in reply to apme, 02-09-2007 18:12:17  
KISS principle. Simple things first. Do what old says- likely that the rings are not seating= no compression. Had the same thing on a 1939 RC that sat for ?



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old

02-09-2007 19:17:12




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 Re: Model B Compression in reply to apme, 02-09-2007 18:12:17  
Fill all 4 cylinder as full as you can with tranny fluid and let it sit a day or 2. I'll almost bet you have compression after that. It probably sat for a while and the rings and stuck on the pistons and when that happen you get little or no compression. I've run into that a lot over the years and tranny fluid has almost always worked to fix the problem. Oh by the way anything over 90 is good to very good unless you have a dual fuel type then it can be lower then that. Also if you have a hand crank turn engine over as far as you can with the plugs in once in a while, that gets the tranny fluid up and around the valves which help them also. Then after a day or 2 pull the plugs spin it over to clear the cylinders and give it a try it might just start

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Dick L

02-09-2007 19:15:06




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 Re: Model B Compression in reply to apme, 02-09-2007 18:12:17  
Many reasons. Rings stuck in the pistons, head gasket blown or not sealed as in the bolts were never tightened. Valves not sealing. No way you can tell without removing the head and looking on the inside to tell if the valves are down against the seats if you do not have compression.



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