Thelebowski
Registered User
Sorry, i know this has been asked before, but every thread i’ve found relates to a specific maintenance action and reaction, whereas my knock has been going on for a bit
With that being said,
7.3 idi with the zf5. Injectors and pump are <2 years old. Rockers are in torque spec, 40ft lbs.
knocks, increasing with rpm and hard to hear/gone after 1500-2k rpm
Using a stethoscope, I listened to the injectors, they all made that crisp click except for the back two on each side, sounded more like someone hammering a nail in a board, but they both sounded the same so i guessed it was normal
Knock was louder with scope on cylinder head, no knock whatsoever when i scoped the oil pan and bottom of block, so im pretty sure its not a rod.
Im thinking it may be the back injectors, i just dont know how they should sound really, never heard a perfectly good idi running before in person, mine has been a project and half the time i wonder if the strange stuff i hear is normal or not, anything helps thanks!
Good oil pressure btw just installed a mechanical gauge, shows 22-27psi
With that being said,
7.3 idi with the zf5. Injectors and pump are <2 years old. Rockers are in torque spec, 40ft lbs.
knocks, increasing with rpm and hard to hear/gone after 1500-2k rpm
Using a stethoscope, I listened to the injectors, they all made that crisp click except for the back two on each side, sounded more like someone hammering a nail in a board, but they both sounded the same so i guessed it was normal
Knock was louder with scope on cylinder head, no knock whatsoever when i scoped the oil pan and bottom of block, so im pretty sure its not a rod.
Im thinking it may be the back injectors, i just dont know how they should sound really, never heard a perfectly good idi running before in person, mine has been a project and half the time i wonder if the strange stuff i hear is normal or not, anything helps thanks!
Good oil pressure btw just installed a mechanical gauge, shows 22-27psi