Smog pump bypass pulley

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Mar 21, 2007 | 01:16 AM

Jrock909

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Smog pump bypass pulley

Guys I bought a cheap bypass pulley for my smog pump since it locked up on me last week. Well I got the pulley yesterday and it bolted up just fine, but the problem I am running into right now is the belt is squeeling and it's a gatorback belt? Do you think after running the older belt on the newer bypass pulley that would be the reason it's squeeling? I also noticed that the bypass pulley like in the link below is smaller than the original bypass pulley, that could make my belt a tad longer to. This is on a 92 F-150 302EFI motor also. It's a 302 though and it should work fine, I didn't have any problems before I removed the smog pump.

http://cgi.ebay.com/ebaymotors/Auto-...spagenameZWD1V

Mar 21, 2007 | 06:59 AM

frederic

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From: New Jersey

Squeeking belts typically mean slipping, due to not enough tension, or a warn belt. Since you said the pulley is a smaller diameter I'd guess that the tensioner isn't providing enough pressure and the belt slips a bit.

Personally, I'd take a string and route it around all the pulleys, and buy a different length built and skip the bypass pulley you added entirely.

I did that on my 351W powered F350 with no problems.

Mar 21, 2007 | 07:22 AM

Conanski

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From: Ottawa, Ontario

Check the belt for alignment WRT the new pulley, it may be offset relative to the rest of the pulleys and it doesn't take much to create noise.

Mar 21, 2007 | 12:26 PM

eco

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From: The dark carnival

I looked into that a little while back, and the techs at Ford Racing told me that it was for Mustangs only and that it would not work for a truck. So, I just went with a shorter belt which gave me more contact at the alternator which is nice because I have a 3g alternator and some aftermarket accessories and thus more load at that pulley.