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Re: 8N engine smoke

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Hiney

04-03-2013 10:07:24

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Hobo,

Thanks for the reply. I have Googled, the cylinder leak test and have a couple of questions. Forgive me if these questions seem simple or elementary, this is the first time I have really tired to diagnosis such an issue. I understand the cylinder leak test requires you to pressurize the cylinder at TDC with compressed air and see how much and where the cylinder is leaking air at, be it the intake, exhaust, rings, or head gasket, etc. What I am struggling to make the connection with is for in this case when the compression test showed all cylinders were within spec, what new information will this test provide me in regards to the reason that the engine is followed by a large cloud of blue smoke? Can the compression rings be sealing allowing for good compression results but the oil rings not sealing and allowing the oil into the cylinders, thus the blue cloud of smoke? But if this is the case, how would the blue smoke be coming out of the oil filler tube as well as the exhaust?

Hiney

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Hobo,NC

04-03-2013 19:17:25

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Re: 8N engine smoke in reply to Hiney, 04-03-2013 10:07:24

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No all of them are not in spec...3&4 are low not in spec (if they were why is 1&2 so high/normal) were's the loss at... A leak down test will help determine were the loss is... You and most get caught up with the advertised min. spec,,, if all were 90/95 you would assume all were evenly worn but why are 3&4 so far off...
Lets say it was ran hot and scored the rings,pistons and walls all the cyl. had 90 would you assume cuzz you had min spec's it would be OK to move on with life...

A leak down will tell ya were the compression loss is it will not tell much about the oil control rings but that can not be determined yet... So why are 3&4 so far off... Read on about cylinder leakage... 20% is the line drawn for severely worn engine if all the valves seal and show no valve leakage... If you use 115 as a # for a engine in top notch condition and divide it by 10 you get 11.5,,,, 11.5 X 2 = 93 so I would consider a 93 compression number if all the valves seal to be a severely worn engine that has something to do with the rings, pistons are cylinder walls... You will have to de a leakage test to figger this out... NO ONE can tell you by a compression test alone why 3&4 are so far off other than a guess....

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JCinKY

04-03-2013 17:32:15

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Re: 8N engine smoke in reply to Hiney, 04-03-2013 10:07:24

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If i could add my 2 cents...

You have answered your own question. Piston rings wear. In your case oil rings cannot hold the oil, compression rings don't seal properly, thus oil is drawn into combustion chamber hence the blue smoke from exhaust. Cumbustion byproducts are forced past the compression ring and into the crank case, thus smoke from the filer neck.

By adding oil during your wet test you have helped seal the compression ring and got higher numbers. That was expected. The only thing a leaked down test wil also show if you are leaking at the valves. Air out of carb,leaking intake valve. Airout exhaust, leak at exhaust valve.

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