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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / October 2006Bad jeep engine knock
1999 jeep wrangler 2.5L inline, 5 speed manual. 95K miles. After pushing my jeep hard to get up a hill while offroading, a loud knock came from the engine. The knock is slow while 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. Thank you for any help, Scott >1999 jeep wrangler 2.5L inline, 5 speed manual. 95K miles. After >pushing my jeep hard to get up a hill while offroading, a loud knock [quoted text clipped - 5 lines] >Thank you for any help, >Scott 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. > 1999 jeep wrangler 2.5L inline, 5 speed manual. 95K miles. After > pushing my jeep hard to get up a hill while offroading, a loud knock [quoted text clipped - 5 lines] > Thank you for any help, > Scott 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 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pictures.html?id=2115147590 (More Off Road album links at bottom of the view page) > 1999 jeep wrangler 2.5L inline, 5 speed manual. 95K miles. After > pushing my jeep hard to get up a hill while offroading, a loud knock [quoted text clipped - 5 lines] > Thank you for any help, > Scott > 1999 jeep wrangler 2.5L inline, 5 speed manual. 95K miles. After > pushing my jeep hard to get up a hill while offroading, a loud knock [quoted text clipped - 5 lines] > Thank you for any help, > Scott 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  Signaturereplace "fly" with "com" to reply. http://home.comcast.net/~njnagel Terminator13 wrote: 1999 jeep wrangler 2.5L inline, 5 speed manual. 95K 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. > Terminator13 wrote: > [quoted text clipped - 19 lines] > > Rodan. 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? Terminator13 wrote: 1999 jeep wrangler 2.5L inline, 5 speed manual. 95K 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. _________________________________________________ Terminator13 wrote: 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. >1999 jeep wrangler 2.5L inline, 5 speed manual. 95K miles. After >pushing my jeep hard to get up a hill while offroading, a loud knock [quoted text clipped - 5 lines] >Thank you for any help, >Scott 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 www.donsautomotive.com chedck the cat converter it can sound like a rod knock if it's broken inside > 1999 jeep wrangler 2.5L inline, 5 speed manual. 95K miles. After > pushing my jeep hard to get up a hill while offroading, a loud knock [quoted text clipped - 5 lines] > Thank you for any help, > Scott |
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