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35 perkins

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Rick

04-21-2002 19:26:14




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I have a 35 3 cylinder perkins that recently starting get a fair amount of light blue smoke when I drive it at wide open throttle. It also has a slight miss at full throttle and then it seems to smoke more. It does it for a while and then it goes away. Any ideas of what is causing this.




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H.T.Hertz

04-22-2002 12:26:40




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 Re: 35 perkins in reply to Rick, 04-21-2002 19:26:14  
If your motor starts and runs ok, but eats a fair amount of motor oil, it is probably motor oil, that is burning, when you give it full throttle... There are several ways for the motor oil to get into the combustion chambers, mainly due to wear. My 3cyl perk eats about one quart of motor oil every 5 hours. I think most of it goes in along the intake valve stems, and then some is not scraped off the cylinder walls by the piston oil rings. When I have been running it for a period at little or no load, say using my circular saw, and then crack the whip, I get a (un)healthy cloud of blue to purple smoke. After revving up a few times the cloud disappears as the motor oil accumulated in the cylinders burns.
Then again it could be that your injector nozzles do not spray correctly at full whip, meaning that they do not close fast enough or even drip a little. Last it could be a head gasket, but then you would possibly have other symptoms such as water blow-out or water in oil/oil in water, and the engine would miss at startup with lots of grey smoke. All cases will cost you some money to fix - case one a piston/sleeve job and new valves and guides/seats. Case two a new set of nozzles and a nozzle adjustment. Case three, a new head gasket plus maybe a head and block surface job.

H.T.Hertz
Denmark

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