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Removed smog pump, shredding belts
#775194 April 27th 2021 1:13 pm
Joined: Apr 2021
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Hey all, first time poster here - 1987 Chevy G20, swapped the 305 with a 350
I had a lot of squealing from my belt, so I changed it
Still squealing so I changed the idler pulley.
Then the alternator
Then the Belt tensioner
Still squealing. So I removed the smog pump and got a shorter belt to replace the old one. low and behold, she quieted down. I was sitting pretty thinking I had the issue fixed but the next day my belt started to shred, so I got a new one and chalked it up bad installation, seeing that the belt was riding too close to the inside edge of the AC pulley. no problems for the day, no problems the next morning, but now it’s shredding this one. Thinking that the belt may be catching on the bracket bolt that connects the tensioner to the A/C. The end of it looks a bit shiny. My question is are there any unusual side effects to a smog pump delete such as chewing through belts or could it be this little accessory bolt in the way? Runs just fine and then the belt starts getting shredded all of a sudden. Thanks in advance.

Last edited by Dr_DoNothing; April 27th 2021 1:15 pm. Reason: Year make model
Re: Removed smog pump, shredding belts
Dr_DoNothing #775202 April 27th 2021 3:58 pm
Joined: Apr 2004
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Get a loan of or rent a dial gauge and check the pulleys to see if they run true or have a wobble in them. I had an issue like this and it was the harmonic balancer was out of whack ( the main/crank pulley mounts to it). Replaced the harmonic balancer using the correct tools and it sorted the problem.


79 chevy G30 cobra camper conversion.
[Linked Image]
Re: Removed smog pump, shredding belts
Dr_DoNothing #775214 April 27th 2021 8:14 pm
Joined: Jan 2014
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Yep, what shaggy said. Sounds like something is still out of alignment to me.

Harbor Freight has a cheap dial gauge that should work just fine.

Dial Gauge Link


[Linked Image from live.staticflickr.com]

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