PLEASE HELP 6.4 knock after heads replaced.

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05-20-2018, 01:51 PM

Dock

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Join Date: Jul 2005

Posts: 3

PLEASE HELP 6.4 knock after heads replaced.

My 6.4 is knocking and smoking. Just had the heads replaceds and the mechanics dont know what it is.

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thanks ryan

05-20-2018, 02:28 PM

Hayapower

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Join Date: Jul 2006

Posts: 7,471

Heads were OE/reman or replacements? Who’s gaskets? Bolts or studs?
You have a pressure gauge installed,, is it over pressurizing the coooling system, puking coolant from the degas or out of spec pressures/temps on a hard pull? Sounds like on initial start, it maybe hydro locking a bit..

05-20-2018, 03:23 PM

Dock

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Join Date: Jul 2005

Posts: 3

Brand New heads, race studs and gaskets not sure which brand. The gauge is for the fuel pump on a different problem that i had where when i was pulling a hill it would die. This knocking happens after its hot, its not as bad if the truck is cool. Could an injector be leaking when i turn off the truck? I will check and see if im low on coolant.