Skreddy
SILVER Star
79 FJ40 with stock 2F. Just replaced the head. Have a deep knock/tick sound. Can hear it well at idle but gets fainter as rpm’s increase until you can’t hear it at all anymore at maybe 2000 rpm. The engine runs fantastic, super smooth, tons of power, no smoke. I do not believe this to be a rod knock because it doesn’t behave like any other rod knock I’ve ever heard. Also, it occurs at the same speed as valve timing events. This leads me to believe it’s something related to work I’ve done in the past few months resealing the engine: something hitting a cover, etc.
What I’ve done to diagnose:
Have removed belt so it is not water pump or alternator.
Desmogged so not air pump, air rail or EGR related (though potentially one of the various emissions valves/pieces left but seems too loud for that)
Removed fuel pump and ran it so not fuel pump related.
Rechecked valve adjustment.
Ran with valve cover off and pushed on each pushrod and each rocker arm both sides while running.
Listened with piece of hose and cannot narrow it down. Seems loudest on drivers side front, mid block height.
Does not change with clutch use and much quieter when listening from below near clutch.
At this point I’m leaning toward timing gear related? I think next step is to drop the oil pan and check rod bearings to be sure, then probably timing cover off. I’ve been reading up on threads and have seen quite a few that describe same sound and years of trouble free service. Almost sounds like a Cummins 12 valve diesel idle.
Here’s a video. It is much louder in the video than in person.
What I’ve done to diagnose:
Have removed belt so it is not water pump or alternator.
Desmogged so not air pump, air rail or EGR related (though potentially one of the various emissions valves/pieces left but seems too loud for that)
Removed fuel pump and ran it so not fuel pump related.
Rechecked valve adjustment.
Ran with valve cover off and pushed on each pushrod and each rocker arm both sides while running.
Listened with piece of hose and cannot narrow it down. Seems loudest on drivers side front, mid block height.
Does not change with clutch use and much quieter when listening from below near clutch.
At this point I’m leaning toward timing gear related? I think next step is to drop the oil pan and check rod bearings to be sure, then probably timing cover off. I’ve been reading up on threads and have seen quite a few that describe same sound and years of trouble free service. Almost sounds like a Cummins 12 valve diesel idle.
Here’s a video. It is much louder in the video than in person.