Bad pulley or what?

[paroxysym]

So I've noticed a banging/rattling at idle so I crawled under my jeep and have kind of pinpointed it to the front bottom end of the motor. I want to say its the crankshaft pulley, however I am wondering what else it could be? It's a 4.7 with 115k on her. Thoughts??

[Matt]

is it a consistent sound that's always there at idle, or is it intermittent?

happens when the engines warm or cold, or doesn't matter?

[paroxysym]

is it a consistent sound that's always there at idle, or is it intermittent?

happens when the engines warm or cold, or doesn't matter?

Doesn't happen at start up, takes a minute but once the rattle gets going its pretty constant at idle.

[Matt]

Take the serp belt off. Manually spin all of the pulleys to see if there's a dead giveaway. If you're unsure, start the engine with the belt off and see if the noise is there (won't hurt anything to run it like this at idle for a few minutes... just watch the temp gauge)

[paroxysym]

i noticed it does it more when there is not load per say on the engine- when im sitting in neutral, foot on the brake just idling its more constent. when its in drive and i have my foot on the brake it does it but its more intermittent.

[paroxysym]

well.... found the source of the sound- bad crankshaft pulley. after stopping for gas yesterday and popping the hood while it was running, you can see the crankshaft pulley has some play it in at idle, theres a bit of a wobble to it.

so im thinking ill be ordering a new one from rockauto, local shop wants $200 to install it

[07JeepXK]

well.... found the source of the sound- bad crankshaft pulley. after stopping for gas yesterday and popping the hood while it was running, you can see the crankshaft pulley has some play it in at idle, theres a bit of a wobble to it.

so im thinking ill be ordering a new one from rockauto, local shop wants $200 to install it

$200 to install a crank pulley?!?!? You can do that yourself. I'd recommend changing out the front seal while the pulley is off.

[paroxysym]

$200 to install a crank pulley?!?!? You can do that yourself. I'd recommend changing out the front seal while the pulley is off.

yea $200 to drain and fill the radiator since that has to come out and the fan and stuff, as well as install the new balancer. i didnt see a seal on rockauto..

i just priced one on rock auto and a new belt- those along with new front brake pads and new wheel speed sensors was $180 shipped, i love that site.

i cant believe coolant is so much- she is due for a flush

[06JeepXKHEMI]

I think he's referring to the crank seal..

[07JeepXK]

yea $200 to drain and fill the radiator since that has to come out and the fan and stuff, as well as install the new balancer. i didnt see a seal on rockauto..

i just priced one on rock auto and a new belt- those along with new front brake pads and new wheel speed sensors was $180 shipped, i love that site.

i cant believe coolant is so much- she is due for a flush

Ummm who told you the radiator has to come out to replace the crank pulley?!?!? I hope it wasn't your mechanic or I'd highly recommend finding a new one ASAP. As far as the seal I got mine right from the dealer to ensure I was getting the correct seal.