Compression Ignition Addict
Join Date: Aug 2009
Location: Albuquerque, Nm
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Driver side breather would the the CCV. (crank case vent) Yes, you're absolutely right. The air pressure is escaping by the piston rings, into the crank case, and out the CCV. (might also be escaping out the oil dipstick tube as well)
Here's my question, and it might seem like a kind of silly question. But did you stager the piston ring gaps? They need to be staggered by about 120* off from one another. If they're in line with each other, then you'll lose your pressure.
Which cylinder's did you do the leak down test on? All 8? Are all of the tested cylincer's leaking the air pressure to the crank case?
If all the tested cylinders are losing air, and all the pistons were assembled by the same person/ people, I'd be willing to be it's just that the piston ring gaps aren't staggered. (but, that is of course my opinion, but it's also the "first" thing that comes to mind, especially since the motor was just completely rebuilt)
Hope that helps.
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Providentia Remedium Belli
Early 1995 F-350 Crew Cab Long Bed
33" Hankook RT03 Muders
DIY Intake w/ Napa 6637 filter
3" DP to 4" exhaust
Charge Air Cooler
Upgraded gear reduction starter
Bypass Oil System
Bypass/ Coolant filter system