I cant spend too much time outside the truck with it running due to the very large exhaust leak otherwise i would take some socket extensions, stick em on the oilpan and listen for it that way, shortly after startup and at extremely low RPMs right as the motor comes to a stop after shutoff there seems to be a sortof clattering or knocking sound, i can hear it from inside the cab aswell.

The motor sat for a few years and was ran fairly hard by the previous owner beforehand, so im not sure what all to think about it. im thinking its just varnished oil on the lifters but i cant be sure. Oil pressure is really good (around 43+PSI at idle) and raises to about 60 under high rev.

 

Video of the clunk once the motor stops spinning. about an hour after this i went outside and the clatter is gone now that its heatsoaked a bit and the temp gauge is off the peg. i think its just clatter now since rod knock would get even more apparent as the oil warms and gets thinner.

 

Will watch the video when I get home, but.. Do you now believe the engine is good?

 

everything points to not having the money to pull and rebuild so it damn well better be.

 

Hi there. It was hard to hear audio, but that engine did sound somewhat grumpy.

First things I can think of are (not being funny).. check if there is good fresh oil in there,
. I know you said it has good oil pressure etc. Let it run, let it circulate, check all systems etc.

That could also be some kind of detonation, or alternator about to seize up, bad bearing accessory drive belt somewhere.

 

Sometimes you can tell from the frequency.

Rod knock may be present at every single revolution, while valvetrain is only half that.

Videotaping once all around the engine bay may give better results. Start with open hood around the drivers side firewall and walk around the front slowly. Try not to have the camera in the airflow from the fan. Don't lean too far into (DANGER: moving parts, and filming will distract you). Maybe have somebody hit the accelerator in 2 or 3 second intervals.

 

Rod knock sounds like this.

 

Yeah its not that, went around for a little bit and put about 7 miles on her and i think its just something in the engine bay rattling at this point, The oil has been changed plenty especially with it leaking out as it is and being topped up after sitting for too long to keep it in the crosshatching.