Have Jeep questions? Ask a Jeep repair expert for answers
hello, my name is ***** ***** I will be glad to assist you. please allow me a couple of minutes to gather some basic info.Roy
when the engine locked up, thats when the damage happened.
when the exhaust valve or chain failed and the valves were open, there was a collision with the valve and the rod bent.
this all resulted from the cam locking up. it most likely locked up from damage over time from the low oil from before. metal shavings are usually the result of bearing material from the mains, rods and from the cams in the heads.
The machine shop holds some liability to the assembly of the motor but the root cause of failure goes way back to the beginning.
Sorry, tough case to prove either way.
ok, but my concern is the cam lock up. it was starved for oil and thats why it locked up.
the chain walking off is another issue, I agree and it was not right.
when they did the rebuild, did they replace the head where the cam locked up?? that could have been the source of the metal.
hi my name is ***** ***** have actually seen these engines valve seats drop. this is rare but does happen and if it dropped the way it did on you enough to lock the engine then it can cause the timing to come off because everthing is still wanting to move it will skip teeth. a slipped timing chain will not cause a valve seat to drop though. the ones i have seen drop have been from excessive overheating. doesnt sound like that happened in your case. the seats are just pressed into the head as they are on all aluminum heads.