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Compression Pressure

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RCP

02-18-2001 06:34:37




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Checked compression on the 77 (gas engine) yesterday, and the gauge said 145 to 155 psi for all six cylinders. This is higher than I expected, but I don't have a manual. What is the expected value?
Thanks
Rich




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Thanks for the Input

02-22-2001 11:41:22




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 Re: Compression Pressure in reply to RCP, 02-18-2001 06:34:37  
Thanks for all the constructive feedback. I have checked the gauge calibration, and it is accurate. Therefore I am going to look for domed pistons and probably try the water injection.



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vern in ne ks

02-21-2001 14:57:43




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 Re: Compression Pressure in reply to RCP, 02-18-2001 06:34:37  
While you have a spark plug out, take a flashlight and look in the cylinder, you just may well see a domed piston.



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Jerry B

02-20-2001 12:06:26




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 Re: Compression Pressure in reply to RCP, 02-18-2001 06:34:37  
If you do actually have a carbon build up in the cylinders, then I would use just the water and not the brake fluid to remove the deposits. A couple quarts of clean water squirted slowly into the carburator while the engine is warmed up and operating at high idle will usually do the trick.

You may have to repeat the process again in a few days to complete the cleaning however.

If you wish to use the Marvel Myster Oil method, may I suggest to warm the engine up to operating temp, shut it off, remove the plugs and squirt the oil into the cylinders. Crank the engine over several times with the ignition furned off and the plugs inserted. Fire it up a few days later and watch the carbon and smoke fly!

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Paul Stanley

02-18-2001 09:44:30




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 Re: Compression Pressure in reply to RCP, 02-18-2001 06:34:37  
With the tractor at operating temperature and at cranking speed (150rpm) the book says 120psi. Maybe someone planed the head.



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RCP

02-18-2001 15:13:35




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 Re: Re: Compression Pressure in reply to Paul Stanley, 02-18-2001 09:44:30  
Could be, I can tell that the engine has been apart before, but the people I bought it from didn't know the history. I am also going to check the accuracy of the gauge, could be it is out of calibration.
Thanks
Rich



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larry Wolfe

02-18-2001 15:28:41




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 Re: Re: Re: Compression Pressure in reply to RCP, 02-18-2001 15:13:35  
One old mechanic told me high compression was from a build up of deposits in the cylinders.His solution was to mix brake fluid and water,and slowly pour it into the engine carborator while it was running. I thought he was crazy! Your engine may have been souped up, by someone wanting more power. Paul has wrote the most likly cause.



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RCP to Larry

02-18-2001 15:37:11




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 Re: Re: Re: Re: Compression Pressure in reply to larry Wolfe, 02-18-2001 15:28:41  
You may have hit it on the head, the plugs are full of carbon, as if a bad oil problem. But the engine doesn't smoke when started or when the throttle is opened up. I figure I will make sure the gauge is accurate, and then pull the valve cover and see if the stem seals are in place. Have you tried the brake fluid and water approach?
Thanks
Rich



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larry

02-19-2001 09:09:33




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 Re: Re: Re: Re: Re: Compression Pressure in reply to RCP to Larry, 02-18-2001 15:37:11  
No! I would think brake fluid would rust the cylinders. You are supposed to run the engine long enough to clear it all out,but it just seems wrong.



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missery

02-19-2001 10:34:26




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 Re: Re: Re: Re: Re: Re: Compression Pressure in reply to larry, 02-19-2001 09:09:33  
i have used automatic trany fluid before.also marvel mistry oil in the gas will help too.these oils will loosen the carbon deposites in your engine.it won't hurt the engine. dave.



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