Cwarta

iTrader: (12)

Alright so I chewed up a serp belt Friday night and it's been on for a few years and just chalked it up to old belt after taking a quick glance around at the pulleys. Replaced it and made it 2 minutes and chucked it again! So now obviously something is very wrong, so I check over each pulley individually and all is well untill I get to the crank pulley. It's moved out about 3/4 of an inch on the crank! Wth! Everyone is telling me that once you get over 500hp you have to pin it. While if your belt driven boosted I could understand that, but n/A?

I tightened the bolt back up and it pulled back on solid and square, runs true on the crank. While both my crank and balancer are already keyed, it's not a big deal as I put a key in this time as last time I didn't have one. But I don't understand why it would do that when it has no extra force on it then stock.

thunderstruck507

iTrader: (18)

did you use a new bolt when you put it on? I reused my stock bolt the first time because I didn't realize it was torque to yield and it spit the bolt out, pulley never slipped though

Cwarta

iTrader: (12)

Yea I have an arp bolt

JakeFusion

iTrader: (7)

What did you torque it to?

LPE 403

iTrader: (6)

Similar thing happened to me recently. ARP bolt backed out...caught just in time. Back together and pinned this time.

Gray86hatch

iTrader: (83)

If the bolt is torqued properly you should not have issues.

I also put a little bit of rtv under the washer and bolt head to keep it from leaking.

Tim

01ssreda4

iTrader: (96)

Yep, heard this about ARP myself. Looked mine over yesterday and it seemed fine so I'm gonna run with it. I highly recommend a flywheel holding tool and you torque it appropriately. I'm willing to bet the ARPs that have come loose were installed correctly.