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by Winston on July 28th, 2008

Winston

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'89 F 350 , 460 gas engine in motorhome. Engine has begun blowing oil out of the dipstick tube: All cylinders test 155-165 lbs, idles smoothly,lots of power, PCV valve new & has suction at the manifold - WHAT could cause it? Thanks.

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Answers. 2 helpful answers below.

  • by slither on October 11th, 2008

    slither

    You need to do a cylinder leak down test. Each piston in turn is put at TDC and a special set of gauges are use to determine what percent of air is leaking past the rings or valves.

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  • by qwerty on October 2nd, 2008

    qwerty

    clogged egr valve??? somewhere you getting pressure in the crankcase. this could be happening at driving speeds, i'm assuming that your testing at idle?? If the egr is not working right you could be introducing exhaust gases into the crankcase, instead of just normal blow by

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You're reading '89 F 350 , 460 gas engine in motorhome. Engine has begun blowing oil out of the dipstick tube: All cylinders test 155-165 lbs, idles smoothly,lots of power, PCV valve new & has suction at the manifold - WHAT could cause it? Thanks.

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