BIGMAC

On my most recent trip to the track the first two time runs were normal but on run #3 and later runs the car really fell off almost four tenths in the 1/4. I suspected an issue with the serpentine drive belt since boost seemed down a bit. Upon inspection back in the garage the belt looked OK but the belt was two ribs off the crank pulley (see pic). The belt is properly aligned with the pulleys on all the accessories but it seems the forward section of the crank pulley has moved back toward the engine. The pulley was supposedly pinned as part of the Lingenfelter Maggie SC install. It seems the forward part of the pulley is OK. I would appreciate if someone can tell me what in the hell is going on.

Thanks in advance.

Cutlassmaster

Thats easy, it separated from the center hub. You need a new balancer.
Chris

BIGMAC

Thanks. I did not realize such a thing happened. Given my mild setup (see signature) do you recommend a stock replacement or should I go to an aftermarket balancer?

feeder82

its pretty common in fact another thread a couple below yours same issue. Aftermarket is the way to go. Lots of threads on proper replacement also, just search

SG Lou

DO NOT go with a OEM Stock unit or it will happen again somewhere down the road. Most of us have either gone with a Dayco Powerbond OEM replacement or an ATI Balancer. Either or, you will also have to get a new balancer bolt as the one on there is a torque to yield bolt. Use once and your done. Again, most go with a ARP bolt. Much better and it can be removed and re-torqued again and again. Also, if your running a
Maggie you'll want to have the new balancer pinned.
Good Luck

BIGMAC

Thanks. The balancer on the car was pinned by Lingenfelter. Does that present a problem for removal?

BIGMAC

SG Lou

Not at all. Most of the time pinning is done from the front. although I have seen some that was pinned from the side. Easy to check though.

hatewhatownsyou

What do people generally do when changing a formerly
Pinned crank, do you just make another hole?

SG Lou

You possibly could but if an acquired drill template matches the original hole then the template could be aligned with the partial hole already drilled into the crank snout and then only the balancer portion could be drilled out.