Problems with the Engine Pulleys

Yesterday i noticed than my GTP was making a ugly sound in the engine bay. I've checked it and noticed than the main pulley is brocken (bottom and big pulley taking the 2 belts SC&Acc), i dont know the correct name. The center of the pulley is a plastic material. Are a aftermarket replacement or lightweight replacement for this?? Or i need to go with the GM Dealer?.

Thanks



MoshimoGTP
97 WHITE GTP COUPE
1/8 mile time : 9.438sec, 60ft@2.154, reaction +.368

that pulley is your crank pulley. i don't know if you can get an aftermarket pulley, but zzperformance will lighten the stock pulley. so it might be something that you need a dealer to do. i do believe if a different pulley is used, a CASE learn must be done. this takes a computer to do. if i were you, id see how much a dealer would charge to fix.

the center of that pulley isnt plastic though
its metal.....so i dont know what your talking about

can you take a pic of it?

The correct name of the broken piece is Crankshaft Balancer. GM Dealer says me that is the correct name and the price is $160+tax. By Internet, (gmpartsdirect.com) are in about $85+tax dlls. But i want to know if ZZP or other company make this balancer more lightweight or something to give more performance.


Thanx


MoshimoGTP
97 WHITE GTP COUPE

no but the Bonnie is suppose to be stronger and last longer then the GP....look into replaceing it with one from the Bonnie.

This picture (section inside the red) is from the part what i need (mine is broken). GM dealer says me it's part number : 12563267, some one can confirm me this info?.

http://files.automotiveforums.com/gallery/uploads/107029/l67_engine_large.JPG

Thanks a lot


MoshimoGTP
97 WHITE GTP COUPE

UPDATE.

GM PART # 12563268 <-- FOR L67, 3.8 VIN 1
CATEGORY: Engine Crankshaft and Camshaft Balancer
PACK QTY: 1 CORE CHARGE: $0.00
GM LIST: $148.42
OUR PRICE: $84.60
DESCRIPTION: BALANCER


THE other part number is for L36

That is the damper(Crankshaft Balancer). It has no plastic, It has 2 metal parts with a rubber interface between them. This is used to lower the engine vibration due to the cranckshaft rotation. To replace you would need a puller. I do not think a case relearn is necessary since if you install one that is ligther but has the same diameter you would be fine. It has a notch so it has a fixed position to install on the crankshaft and the cost for the OEM is around ~160. Is not that hard to install.

Ok, in www.gmpartsdirect.com cost me 84.60 + shipping. 1/2 price less than the Dealer.

Another question Kilroypr. Why this pulley broken? Use? Race?. I have a photo of my broken pulley, i will submit it.

Thanx

Ahh, and the pulley make a ugly noise with is idle. The mechanic says me than the ugly noise come from inside of the pulley (balancer), is that true?

Thanx a lot again! =)

PIC UPDATE...

http://files.automotiveforums.com/gallery/showphoto.php?photo=15941

UPDATE BROKEN BALANCER PIC...

http://files.automotiveforums.com/gallery/showphoto.php?photo=15941

WOOPS.... AGAIN...

http://files.automotiveforums.com/gallery/watermark.php?file=/500/107029BROKEN_BALANCER.JPG