Smog pump bypass

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Sep 11, 2024 | 10:18 AM

ehusmann

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Smog pump bypass

1993 F150, 5.0L: Having a issue with the air/smog pump making noises and it needs to go. I have read on this forum in the past that you can purchase a shorter serpentine belt and not run the air pump. Can someone please tell me what belt I would need and can I get by without removing the air pump and related plumping? I'm in a bit of a rush as I am moving in 10 days and don't have time to find and wait for a new pump. Also I have far too much to do to be messing with a smog pump at this time. Thanks

Sep 11, 2024 | 10:43 AM

Hit Man X

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From: North Texas

Do you have a pic of the current accessory drive? Around '93/4 the drive layout changed and I never recall the exact cut off.

My '88 302 has the Mustang style accessory drive, which is the '87-93 I guess. Anyway, I just ran the belt from the alt to the crank pulley. Length would not really help as I have an underdrive kit and a Saginaw. Stock was what, 91"? I think I had an 88" for a while then an 85", this is going back near 20 years of memory.

Sep 11, 2024 | 11:17 AM

Scndsin

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From: Central Mississippi

Here is a starting point:

Note: AC idler may not be same size as your compressor pulley.

You will have possibility of squeal at start up.

Additional tightening over that provided by tensioner can be increased with equal number of washers identical in size under alternator.

Sep 11, 2024 | 11:39 AM

ehusmann

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Hopefully these two pics will tell you what you need.

Sep 11, 2024 | 11:48 AM

ehusmann

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Scndsin: You have removed the air pump and I assume the related plumping. Must this be done or can I run the shorter belt with the pump in place?

Sep 11, 2024 | 12:48 PM

Scndsin

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From: Central Mississippi

You may be able to pull the pump pulley & run the short belt. but I've never seen it done.

Sep 11, 2024 | 12:59 PM

ehusmann

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Scndsin: I have seen a couple of youtube vids that tlal about this type of delete but I would like to hear something from this forum before I jump. Thanks for the input.