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Originally Posted by sixto
Thanks for correcting any bad information I posted.
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It's not that it's bad info' just miss-informed. Let's hope nobody gets hurt by thinking there's little to be held back.
Quote:
Originally Posted by sixto
However, during more than one leakdown test I noticed that the crank pulley would start to turn as air was applied and I prevented it from turning furter by holding a fan belt with my hand. Faulty engines? Faulty shop compressor? Seems like it was more than a guardian angel at work.
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It is possible that a valve began to open as the engine started to rotate.
It is also possible that there was not a lot of air volumne too, although I'd rather not test that theory .
Most leak down gauges require 100psi calibration pressure and the secondary air gauge will show a build up to the primary gauge setting if there's little leakage...ie; less than 5%.
Quote:
Originally Posted by sixto
I don't expect to be able turn the crank against compression but I don't recall the crank pulley turning at starter speed or anything greater as the air filled the cylinder with the piston beyond TDC.
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The crank will not initially turn at starter speed...but...if the other pistons are unloaded, ie: injectors out or spark plugs removed, then as it turns past 20 degrees atdc or btdc, depending where the lack of tdc is pre or post tdc, it will accelerate very quickly to bdc.
Quote:
Originally Posted by sixto
Again, I don't want anyone to get hurt so heed the advice of those who know (vs me).
Sixto
93 300SD
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Indeed, your comments are noted.....having been doing this kind of thing for 40 years now, I have learned to be safe.
I would always advise that mechanical locks or careful attention to detail is viewed at a distance, as body parts are not readily replaced.
I'm very glad to be able to offer advise rather than hoping everything will turn out okay.
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