Bad jeep engine knock

ideas

connecting rod ( piston ) is broken on one of the cylinders. If it doesn't perforate a cylinder wall soon, it may in the foreseeable future.

Spun rod bearing. Bad piston rod/wrist pin.

None of it can be good. Sounds like it's time to open her up and have a look around. No point driving until the inevitable 'major' failure. Git 'er done now!

A 'clank' is a totally different sound than a 'knock' and means totally different things. Please elaborate.

Mike

I don't know, but I recommend you find out before putting any load on the engine. Don't want to wipe out a crank before its time. I suspect rod or main bearings, but you may get lucky and find something else wrong. Disconnect all drive belts etc. and run it; if the noise doesn't go away you will have to tear it down. Sorry.

nate

After pushing hard to get up a hill while offroading, a loud knock came from the engine. The knock is slow at idle and speeds up along with the RPMs. It sounds like it is in the lower end of the engine but it is hard to tell. Does anybody have any ideas what could be clanking around before i do any additional damage. _______________________________________________

Could be a lot of things, including broken parts of external engine accessories. If it is a bad rod bearing, it will get quieter under load. If it is a dented oil pan it will bang until the crank counterweight grinds its way through.

Find whatever it is as soon as possible, to avoid further more expensive damage.

Good luck.

Rodan.

First thing to find out is if it is internal or external. Remove all belts and see if the noise is still present.

Cut open the oil filter and look for metal. You will need some kind of a cutter that does not saw the filter housing and create its own metal particles. The cutter I use has wheels. There are cutters based upon the visegrip principle that incorporate cutting wheels in a length of chain.

If you see any glitter in the oil filter the motor is in serious trouble.

Don

thanks Rodan for the help, The dented oil pan does make sense because the knock seems to be coming from around in the oil pan maybe. If this is the case, how did I do this and what should i do next?

After pushing hard to get up a hill while offroading, a loud knock came from the engine. The knock is slow at idle and speeds up along with the RPMs. It sounds like it is in the lower end of the engine but it is hard to tell. Does anybody have any ideas what could be clanking around before i do any additional damage. _______________________________________________

"Rodan" wrote:

Could be a lot of things, including broken parts of external engine accessories. If it is a bad rod bearing, it will get quieter under load. If it is a dented oil pan it will bang until the crank counterweight grinds its way through.

F The dented oil pan makes sense because the knock seems to be coming from around in the oil pan maybe. If this is the case, how did I do this?

Sorry, I don't know. I just can't imagine any way an off-road vehicle could get a dent in its oil pan.

If it is dented, remove it and pound out the dent.

Good luck.

Rodan.