hello , i have a 7fb 3406 b that i lost power on yesterday, truck has allways worked really well, can only get bout 15 -19 psi boost but takes a bit, it used did junp to 32-35 psi when u got into it, i changed fuel filters and blew out fuel lines,checked air filters,checked turbo,turbo is 2 year old cat and spins n looks like new inside with zero play,, did a wuick visual of charge boots, all looked ok and never changed anything , inpuuled afr line no oil in it, injection pump was totally rebuilt 2 years ago also , lookin for ideas, to me whdn i stab the throttle its not gettin euff fuel, it used smoke black when i stood on it not now, everything else is normal, egts, fuel n oil pressure, ideling, no missing , ? stumped
3406 b sudden loss of power
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by tj379, Feb 3, 2022.
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fuel psi at idle?
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tj379 Thanks this.
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afr diaphragm
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i pulled the afr line didn't see oil in it, it was repkaced when injection pump rebuilt not sure the life on em?
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When it’s sudden like that AFRC diaphragm is the usual culprit. I had one not long ago that broke the nail head off the small spool inside, spool was froze in the piston.
black_dog106, Oxbow, A5¢ and 1 other person Thank this. -
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Oxbow Thanks this.
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