Rod Knock!
 

was driving very safe through a parking lot full of snow :rolleyes: and all of of sudden BAM! rod knock....it was only at high rpms at first now its pretty much constant.....can any one say cummins 4bt?

See and people give me a hard time about wheeling Macy's....

wheeling at meijer is way more hard core tho lol

4.0? What oil and weight are you using? The 4.0's I have had all liked high rpm's. They practically begged for it! :eek: I would trade yours for the other tan one on the lot.

i was using 10w30 ive had oil pressure issues so i put a high volume in it like three months ago.......the tan one is nice and it has the 3spd auto but i like mine way to much.....im goin to do something like a stroker or if i win big on a scratch off a 4bt

Have you 100% verified that it is rod knock and not something else that could sound very similar?

4.0s seem to last forever in my experience, and you just installed a high volume oil pump in yours, correct?

im not 100%

maybe
 

Maybe the damage was already done before you changed the oil pump. If it will still run you can use a stethescope at the pan comparing it to other places on the motor. If it's there, why not just pull the crank. Have it honed and polished with .030 larger bearings. OH, I'd pull the pan and inspect it first of course.....

one thing is it dont make noise at idle only some times it only knocks (not pecks) at about 3000 rpm it kinda varies.....its not a good noise at all

Easy fix, slap some new bearings in and go. Did that to a 258 motor that locked up, new bearings, polished up the crank and sent it on down the road.

Ouch..Sorry to hear. Sounds like it's rebuild time.

Nick

Go Bengals!!WHO-DEY!!!

I also run the high volume oil pumps and I did loose pressure one one time years ago on the way to work. I shut it down, pulled over, checked the oil, it was good started it back up and it was fine.

I was talking to a coworker at the time his son drag raced, they shut down on a run for the same reason and there was no problem after that. The way he talked it was kind of common, but that was the only time I had it happen in the 21 years that motor has been in the CJ.

I still use the high volume oil pumps and have one in my spare motor.

I think you should do a 4bt swap. You help me get my project out of the garage and we can do yours next.

i think im goin to sell the tj and get a xj :rolleyes:

Now that is the best idea you have ever had

X2 on that for sure. :beers:

yeah i wanna know that feeling to get stuck and then a tj bust right through it

:eek: :beers: hee hee!