Loud Air Pump Delete Question.

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Loud Air Pump Delete Question.

Postby 1992F-150-4x4 » Mon Jan 19, 2009 8:44 pm

Alright guys, I have a 1992 F-150 with the 300 I6.

Now my issue is the air pump, it's SO LOUD. Once you get above like 1600 rpms it humms so freakin loud it drives me crazy ! So when I installed my tach I got some shorter belts that I could bypass the pump with, great. But the new angle of the belt causes an issue, it rubs on one of the bolts on the alternator, and it has a built in spacer, so I would have to grind that down. I was hoping to just be able to swap belts, but that obviously was not going to happen.

So my question to you is, does anyone know another way of disabling the pump so it will not make noise anymore ? Thanks much !
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Postby THE FRENCHTOWN FLYER » Mon Jan 19, 2009 9:12 pm

On my old 460 powered motor home I put a lawnmower muffler on the outlet port.

Worked for me. Cost $2.50.
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Postby bentwire » Mon Jan 19, 2009 9:22 pm

take it off the truck then useing a dremal tool cut the fins from the back side out of the pump, alot of guys are afraid of this procedure but i have done this on many a pump

Some states require your emissions remain unaltered
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Postby 1992F-150-4x4 » Mon Jan 19, 2009 9:29 pm

Did that have a different set up ? Up on the fender there is a canister with a flexible hose on it, that seems to make a lot of the noise, as the noise changes if you put your hand on it. I don't think it's all the pipe that blows for the exhaust, because when I had my exhaust redone they just made that vent into the atmosphere and tack welded it to my exhaust so it wouldn't rattle.

Here are the vids I have uploaded of it,

In this video it's very noticeable about 30 seconds into it, it would be the loud humm or vibration you hear.
http://www.youtube.com/watch?v=rhNTveGNhUM

And in this other video it's not as noticeable because i didn't rev it way up, but it over powers the exhaust sometime and thats what really bothers me, my truck sounds a lot like a diesel but then the air pump is so loud it covers it up. :evil:

http://www.youtube.com/watch?v=WAlOwKVdQI0
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Postby 1992F-150-4x4 » Mon Jan 19, 2009 9:34 pm

bentwire wrote:take it off the truck then useing a dremal tool cut the fins from the back side out of the pump, alot of guys are afraid of this procedure but i have done this on many a pump

Some states require your emissions remain unaltered


I had considered something similar, I had given thoughts to trying to gut the pump so the belt would only turn the pulley. Maybe I'll get a pump from a junkyard and dissect it to see what all is involved.

And I'm in Michigan so we have no emissions, plus I had my exhaust redone and they just cut it at the manifold, and did pipe into a muffler which goes to a tail pipe, no cats or anything.
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Postby The Plankster Prankster » Mon Jan 19, 2009 10:26 pm

could you maybe remove hte pump and replace it with an idler (pulley that does nothing) you would have to fab up a bracket, but it may be simpler than trying to make the darn thing shut up
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Postby nastybees86-6 » Tue Jan 20, 2009 9:12 pm

I completely removed the entire pump and all the related hoses and what-not but, I have an 86 so I'm not familiar with the fuely set-ups.the belt was allready off when I got the truck. I'm down to 2 belts,alt. and,power steering pump.I also deleted the entire ac except the reciever/dryer and evaperator or condenser I can't remember the name of it in front of the radiator...nice lookin truck though
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Postby willowbilly3 » Tue Jan 20, 2009 11:12 pm

They make it not easy to disgard the pump. You always have belt issues it seems. I think the idler idea is good. Get a smooth one for the back side and make a bracket for it.
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Postby 1992F-150-4x4 » Tue Jan 20, 2009 11:21 pm

A little update, my friend has a 92 F-150 as well, but his has a 302, they appear to be the same pump, and since he has his disconnected and took the pulley off I said, if you take the pump off your truck I want it. So he took it off today and gave it to me after work. I went home and started gutting it. I got it gutted, it wasn't exactly easy lol. It rubs a tuny bit, so i'll be taking a deburring tool to the back side of the housing in hopes of getting rid of the rubbing noise. I hope it will work.
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Postby crash-harris » Tue Jan 20, 2009 11:30 pm

If anything, since you've already bypassed it and if the new one makes noise, then try to fab up an eliminator using the pulley and some steel or aluminium stock (you can buy the eliminators, but for what they are, they're expensive).
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Postby 1992F-150-4x4 » Tue Jan 20, 2009 11:34 pm

The reason I'm avoiding fabbing a pulley is because I want the belt alinged correctly, so I figured if I gutted a pump to be silent, so all the belt was turning is the pulley, I should be good, since everything would be in it's place as it was stock. I just hope the gutted pump can keep itself together lol.
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Postby crash-harris » Tue Jan 20, 2009 11:37 pm

That sounds like a pretty good idea actually. My only gripe would be the extra bearings that could fail n' junk. I replaced my smog pump this past summer because the bearings failed and it was chirping and grinding :shock:
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Postby 1992F-150-4x4 » Tue Jan 20, 2009 11:43 pm

Yea, my friends started to squeal really loud last summer so we got a different belt and took the pulley off the pump.

But when I say I gutted it, I mean it's gutted. The thing probably weighs no more than 3.5lbs now.
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Postby bentwire » Wed Jan 21, 2009 12:33 am

1992F-150-4x4 wrote:A little update, my friend has a 92 F-150 as well, but his has a 302, they appear to be the same pump, and since he has his disconnected and took the pulley off I said, if you take the pump off your truck I want it. So he took it off today and gave it to me after work. I went home and started gutting it. I got it gutted, it wasn't exactly easy lol. It rubs a tuny bit, so i'll be taking a deburring tool to the back side of the housing in hopes of getting rid of the rubbing noise. I hope it will work.


it will work just fine
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Postby mentorcouple » Wed Jan 21, 2009 12:48 pm

I attempted to de-vane the frozen pump with little success. I removed the vanes but had problems with the bearings. I decided to go radical and build a replacement using an idler pulley out of a junkyard. I used a piece of 3" pipe and two pieces of 3/8" pipe. I built it to the dimensions of the air pump. Then welded a piece of flat plate to mount the pulley assembly. I have it installed but not running yet. It looks like it all lines up ok. It took me several tries to get the correct belt length. Currently trying a 1010K6.
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Postby 1992F-150-4x4 » Wed Jan 21, 2009 2:25 pm

mentorcouple wrote:I attempted to de-vane the frozen pump with little success. I removed the vanes but had problems with the bearings. I decided to go radical and build a replacement using an idler pulley out of a junkyard. I used a piece of 3" pipe and two pieces of 3/8" pipe. I built it to the dimensions of the air pump. Then welded a piece of flat plate to mount the pulley assembly. I have it installed but not running yet. It looks like it all lines up ok. It took me several tries to get the correct belt length. Currently trying a 1010K6.


I did more than de-vane. And The bearing are gone as well, my issue is the back housing is rubbing on the cylinder on the inside as it spins, so you can spin it freely by hand, but when you put the cover back on it freezes up. My next step will be taking a deburring bit and grinding the back cover down so it doesn't touch that cylinder as it spins. I think that should solve my issue.

http://i184.photobucket.com/albums/x199 ... 060506.jpg

http://i184.photobucket.com/albums/x199 ... 060507.jpg

And what I'll be enlarging.

http://i184.photobucket.com/albums/x199 ... 060508.jpg
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Postby 1992F-150-4x4 » Thu Jan 22, 2009 12:30 am

Well, I took the deburring tool to it tonight, really helped, now it will spin by hand, but still rubs in a spot, so I think I'll shove a cut off wheel into the cylinder and cut it off somewhere so it won't make contact with that back housing, because that deburring took makes a heck of a mess. I'm really hoping this works.
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Postby 1992F-150-4x4 » Thu Jan 22, 2009 2:09 pm

I had asked my dad if he had spare time to cross reference the part # for a I6 and 302 smog pump, slightly different numbers, I'm hoping the only different is pulley size and or outlets, as long as my pulley bolts on and the belt is aligned right I'll be happy, I got it really quiet now. Might install tonight.


So, doing this will not harm my motor in any way correct ? I will be putting a breather on that rail that goes on the head for the air pump.
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Postby StrangeRanger » Thu Jan 22, 2009 2:52 pm

If you have secondary air injection nozzles in the exhaust ports, then your computer is programmed to run the engine slightly richer during warmup. The air injection nozzles provide air to allow the combustion of unburned HC in the ports and manifolds. Removing the secondary air pump will cause this secondary combustion to occur in the converter thus shortening its life.

If you disconnect the air pump fron the secondary air system, you need either to leave the air injection rail and check valve in place or to pull the head, remove the nozzles and plug the ports.

The other output of the smog pump provides air to the second catalytic converter so that it can oxidize CO into CO2. Without it you will likely fail an emissions test.

Personally, since I breathe air, I'd put a muffler on it and leave it alone.
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Postby 1992F-150-4x4 » Thu Jan 22, 2009 3:00 pm

StrangeRanger wrote: Removing the secondary air pump will cause this secondary combustion to occur in the converter thus shortening its life.


It will burn up in the catalytic converter ? My truck has a custom exhaust, no cats, straight all the way back with a muffler. No cats.

So since I have no cats, what would the effect of removing the pump be ? Would it cause any harm to my engine ? I believe I have the injection nozzles, it kind of look like a fuel rail in way ? If so, I have it.
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Postby 1992F-150-4x4 » Thu Jan 22, 2009 11:34 pm

Well a little update, removed some more from that pump, installed it tonight.

WOW, it's freakin amazing, I can hear my motor and exhaust now rather than that stupid pump. Probably the best thing I've done to the truck ! Probably make a video tomorrow.
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Postby Good Times Machine » Sat Jan 24, 2009 1:47 pm

speaking of exhaust....i designed mine up finally, got it done, looks good, sounds niiice(at idle), no mufflers(resonation echoes into cab really bad unless you gas-it)....cut exhaust off where 2-into-1 cat starts(deleting both cats), ran a straight pipe from each individual header pipe to about 1.5' from front of rear axle(pipes running on top of each other), then the bending creativity got interesting, considering they were both being run stacked and on inside-side of frame rail. Bottom pipe bends down a lil to get horizontally below frame, then bends 90* towards passenger side, runs a lil, then bends a hair downwards to bypass lip of running boards(turned-down look). Top pipe in essence does same thing, except top pipe exits on passenger side about an inch from end of running board, and the bottom pipe exits about 2" in front of that....it actually looks pretty cool....and i havent hit any more deer....think the sound scrambles their brains to the point of no return(they CAN'T move :D )

Edit: Pump makes a lil noise, but it also makes engine idle down(richening it?) enough that a good rasp makes FIRE-IN-THE-HOLE!!!! Or out of the holes in this case :twisted:
Pump noise sounds like an air hose blowing thru a fan, lol. Think I might reroute a flex-i-tube from cat-tube(tube that fed air to cat) to the intake, that might soften the noise. Or I could route it to the O2 sensor and use my pipes as lethal flame throwers....hehe :twisted:
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Postby big_ford_rednek » Wed Jan 28, 2009 2:10 pm

make sure you have really good support when you run duals back off of where the 2-1 cats are. on mine anyways ended tearing a whole rght infront on the 02 sensor when i hit a bump and the upper exhaust pipe came up and really screwed things up cuz it bent that pipe infront of the 02 and bent it enough as to make a nice gash out of hte exhaust. if that makes any sense, i had to weld around the 02 bung to make it work
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