poopmat

would a timing chain being screwed up cause a valve to hit the piston????
thanks

freegdr

depends on the engine your talking about

poopmat

4.0 v6

freegdr

jeep??

Outlaw Star

Uhhh, the Jeep 4.0L is an I6 not a V-6.

freegdr

heres alink to a list of interference motor is it on the listhttp://www.aa1car.com/library/timing...ce_engines.htm

poopmat

oops i forgot its an inline 6
its been a long day
when i pulled the head off the engine there was a bent valve and a ding on the surface of the piston
my friend said it could have been the timing chain
now that the head is resurfaced and the valves all fixed and redone
i just want to check everything that could have caused this

mphilleo

I'm not a pro, but I would guess this is possible. If a bad timing belt can result in bent valve goodness, I imagine a very, very loose timing chain/guides can result in what you're describing. Can you hear it slapping loosely on the valve cover when you're at idle?

poopmat

nope i never ran the xj it was my buddy's and i got it as a gift already busted i originally thought it was a headgasket but the gasket was fine and the valve was stuck open so im just trying to cover my bases

mphilleo

In that case, it'd be worth checking the chain and the guides.

poopmat

any other suggestions as to what could have bent the valve and stuck it open causing the engine to overheat??

Outlaw Star

Sometimes if you overrev an engine the springs will not be able to close the valve fast enough. This is known as valve floating. Also improperly torqued or adjusted rocker arms or stuck lifters can cause this.