Serp. idler pully ?

[big jimmy 91]

On my stock 91 350 the plastic idler pully siezed up and self destructed (serpentin belt)
Does it have to be another plastic one to replace it or can I put in a steel one instead
Anything wrong with steel over plastic??

(this pulley is under the AC unit on the block)

 

[southernspeed]

I just bought a complete serp set up from GM and mine is steel!

 

[big jimmy 91]

How much?

There was only the one plastic one on my stock set up

 

[southernspeed]

Got it from Summit. mmmmm...can't remember how much at the moment. Only bought it a few weeks ago....must be getting old!

 

[mosesburb]

AC Delco 15-4957. This is a complete asm, bolt, washer and pulley.

Four Seasons 45979. This is a correct steel replacement (pulley only).

API 7145979. Same as above.

Gates lists a #38006, but the front of the pulley is not shaped correctly to reuse the washer under the bolt. The washer is not neccessary, but it will contain the pulley in the event of a bearing failure. I don't use these.

 

[big jimmy 91]

Thanks for the info

I ended up going to the scrap yard and found a steel pully that fit the application , it was just loose on a shelf full of parts so I don't even know what its from but it seems to be working (for only $5.00)