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Ford 9N, 2N & 8N Discussion Forum
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Snowball effect

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Rob N VA

09-01-2004 18:32:44




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I went to change the oil tonight, and ended up pulling the filter housing and sanding it down to bare metal and painting it. Then I did the fill tube. Then I Drained the antifreeze and changed it. Then I cleaned the air filter out. Then I decided to check the compression. I always looked at checking the compression on my 8N kinda like going to the doctor when you are 80 and asking him to check your prostate (SP?). Chances are you aren"t gonna like the news you get. Well, curiosity got the better of me and this is what I found...

(1) 100
(2) 60
(3) 85
(4) 80

These are all dry readings, cause I ran outta daylight. I am gonna try a wet reading tomorrow. What is causing the extreme variation in compression? She dosen"t burn a drop of oil! Speaking of which, do you guys think I just wasted an oil change? Any theories of thoughts are greatly appreciated!---Rob

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valve leak..John,PA

09-01-2004 18:35:59




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 Re: Snowball effect in reply to Rob N VA, 09-01-2004 18:32:44  
When you are 80, which is worse, the news of the "Prostate" or a leaking valve?



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gahorn

09-02-2004 07:29:43




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 Re: Snowball effect in reply to valve leak..John,PA, 09-01-2004 18:35:59  
If you get a valve-holder spark-plug adaptor from NAPA (costs about $10, and is nothing more than a sparkplug threaded bottom with an air-hose connector on it) you can put the piston at top dead center and lock the tractor in position in gear so the engine won't turn, and putting about 50-80 psi air into the cylinder. Then you can listen at the carb to see if the intake valve is hissing/leaking, ...or at the exhaust to see if it's the exhaust valve,...or listen at the oil filler to see if it's the rings. This is how it's done at the airport on aircraft reciprocating engines. (Except we measure the actual drop of pressure across a calibrated guage-set also. But the diagnosis technique is valid regardless of dispensing with the gauge set.)

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gahorn

09-02-2004 07:32:41




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 Re: Snowball effect in reply to gahorn, 09-02-2004 07:29:43  
Whoops. Forgot...I got that tool from Car Quest..not NAPA...but I'll bet they have one too. Or you can make your own with an old discarded spark plug and an air connector. The tool is normally used to hold valves closed with compressed air so that valve springs/keepers/rocker arms can be changed/removed. But any leaking valves/rings will be found out by the loss of air and hissing.



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