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Could drain the oil and have a look at it.
Cut open the oil filter and look for copper.
This. Or you could go with a Blackstone Oil analysis. It's $28 but they'll be able to give you a full breakdown of what's in the oil and it's far more precise than eyeballing it.

Something else you might attempt trying, pull one plug wire/coil at a time and put a light load on the motor. If the sound goes away with one of the cylinders not firing that would at least give you a starting point.
 

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Discussion Starter #25
I did test for rod knock with a long screw driver, no play. Also tried pulling one spark coil at a time but that only work if you can hear the knock at idle or rev. It had 3 oil changes and all looked normal.
 

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Discussion Starter #26 (Edited)
Alright i pulled the trans off today and everything looks normal. Flywheel is tight, no cracks. Clutch and pressure plate looked normal. There is some play between the pressure plate and the throw out bearing but i think thats normal. Other then that im leaning towards the bottom end now.
 

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ƒ=1/2π(√k/m)
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Alright i pulled the trans off today and everything looks normal. Flywheel is tight, no cracks. Clutch and pressure looked normal. There is some play between the pressure plate and the throw out bearing but i think thats normal. Other then that im leaning towards the bottom end now.
Yeah. Will be interesting to see the mains and rod bearings.
 

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You didn't have a rod cap torqued properly.....forget about it pull the motor and get the crank properly done. That rod needs to be cut and resized. If those are rods that never been replaced or resized do all of them. Cheap build, poor assembly, and piss poor tuning will cause rod knock from the word go. Since your friend had the same problem I'd say you both need a lesson in proper engine assembly.....no disrespect intended.

I've made a bazillion post about this with the 7mgte, and the 2jzgte is no different when assembled improperly.

Hey Brent.....and everyone else
 

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I've made a bazillion post about this with the 7mgte, and the 2jzgte is no different when assembled improperly
Kinda goes for all motors to some extent. Always entertaining to see people bag on the 7M, then turn around and have the same issue on the 2J.

Hey Brent.....and everyone else
 

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Discussion Starter #32 (Edited)
Update on this....

I slapped on a different transmission with a stock pressure plate and stock clutch, new throw out bearing and pilot bearing, same knocking still there.


I pulled the motor, checked all the rod bearings and main bearings. They are all clean, no scoring or anything bad. At this point I dont know what else to check that could make that knocking/tapping. Its been a nightmare trying to diagnosis this knocking noise.
 

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Discussion Starter #36

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Man, I agree with you. Journals and bearings look pretty good, minus one looks scarred a little.
No signs of heat/wear. (discoloring.)

Any noticeable play in the wrist pin at the piston? That clacking was coming from somewhere.

Maybe piston slap.
Could take the block to a machine shop to bore mic it.
Curious now, did you compression test this engine? (I'll re-read your thread to see if you did.)

Literally in the first post.. ~200psi... This is frustrating. haha.
 

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Discussion Starter #38 (Edited)
Yeah this is frustrating, im like out of ideas what this knocking is coming from. The bottom end was the last thing to do. Really in person it doesnt sound like a rod knock. Ive heard rod knock before and it doesnt sound like that.
 
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