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NEW Engine, Wont Start Air Locked?

Old 03-17-2016, 09:54 AM
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Default NEW Engine, Wont Start Air Locked?

Hello guys,

I recently installed a new 6.4 and it will NOT start.

I replaced the longblock, new inector lines and high pressure pump, cleaned injectors and so on.

When i crank it over it builds pressure from 300-900 psi.

I bled air out at the fuel cooler

when i first crank the truck it will build up to 900psi then drop off and stay steady at 3-500psi

It tires to fire, im getting white smoke out of the tail pipe

as a last ditch effort i loosened and bled the two lines that go into the heads. got some more air out

only code is low cranking pressure
then called it quits last night

ANY HELP? keep cranking till she fires?
Old 03-17-2016, 06:44 PM
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keep bleeding out the air as best as you can....keep a charger on your batts. and dont forget to let your starter rest....scott
Old 03-17-2016, 10:03 PM
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J Johnson is correct, keep bleeding out the air till it start, just be careful not to burn the starter.
Old 03-18-2016, 02:27 PM
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hello everybody

to answer some questions.

Fuel bowl was filled before craning engine

both the FEED and RETURN have been bled on the fuel cooler

NEW FOMOCO filters in frame and in bowl

All 8 injectors were cleaned, serviced and tested with calibration oil.

Last night i removed the injectors for testing, will update shortly.

thank you


IF YOU HAVE REBUILT A 6.4 and installed it please PM or CALL me, I have a few questions

thank you


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