Air pump making noise?!?
Thread Starter
|
Tuned
Joined: Jan 2013
Posts: 398
Likes: 3
From: Vancouver Island BC
Air pump making noise?!?
So sometimes at idle, and especially when cold, I get a "grumble, grumble, grumble... grumble" sound coming from the passenger side of the engine bay. It comes and goes.
You can't hear it in the truck, but once you get out of the cab and walk to the front of the truck you can hear it.
Oddly enough it SEEMS to go away sometimes when you turn the heater from "DEF" to "OFF", but that could have been a coincidence. That would make more sense if it was from the drivers side, I would suspect the A/C compressor.
So my question is, could it be the air pump? I spun it the last time I had the belts off and it didn't feel super smooth, but not horrible either... Possibly the bearings are gone on it? Maybe the alternator, but it seems to be coming from lower down.
Ideally I'd like to remove the air but cant seem to find a detailed set of instructions on the process, and what is required... I ditched it on my '79 Bronco years back, but most of it had been disabled already
Biggest thing I guess would be needing a shorter belt? Anyone know the belt #, or just measure and go to the parts store?
Any info would be great...
You can't hear it in the truck, but once you get out of the cab and walk to the front of the truck you can hear it.
Oddly enough it SEEMS to go away sometimes when you turn the heater from "DEF" to "OFF", but that could have been a coincidence. That would make more sense if it was from the drivers side, I would suspect the A/C compressor.
So my question is, could it be the air pump? I spun it the last time I had the belts off and it didn't feel super smooth, but not horrible either... Possibly the bearings are gone on it? Maybe the alternator, but it seems to be coming from lower down.
Ideally I'd like to remove the air but cant seem to find a detailed set of instructions on the process, and what is required... I ditched it on my '79 Bronco years back, but most of it had been disabled already
Biggest thing I guess would be needing a shorter belt? Anyone know the belt #, or just measure and go to the parts store?
Any info would be great...
Postmaster
Joined: Nov 2011
Posts: 3,533
Likes: 17
From: SW Florida
I would think Summit Racing would have the idler pulley that goes in it's place. If you can't find it in their catalog, call them up because they don't list every single part they carry.
I've also hear of guys just taking the guts out of the pump, but not knowing whether it's the bearings or the internals that usually lock up, I'd be careful doing it. Gutting it won't help if the bearings are prone to failure, which it seems most air pumps do tend to lock up.
As far as removing it goes, the one I did was basically just plugging the lines to the exhaust. Then remove the fresh air plumbing, but leave any solenoids in place and make sure they stay plugged in so you don't get the check engine light. This was on a 302 car though, the trucks might be plumbed differently. Someone will post with details I'm sure.
I've also hear of guys just taking the guts out of the pump, but not knowing whether it's the bearings or the internals that usually lock up, I'd be careful doing it. Gutting it won't help if the bearings are prone to failure, which it seems most air pumps do tend to lock up.
As far as removing it goes, the one I did was basically just plugging the lines to the exhaust. Then remove the fresh air plumbing, but leave any solenoids in place and make sure they stay plugged in so you don't get the check engine light. This was on a 302 car though, the trucks might be plumbed differently. Someone will post with details I'm sure.
Tuned
Joined: Jun 2012
Posts: 276
Likes: 0
I just removed mine last weekend on my 460. Ghe pump was really hard to turn and my cat had been removed when my exhaust was done up. The belt you need is a 470k6 or equivalent. At first I just removed the pulley as one of the mountings was being stubborn. A few days later I got the bolts out.
Thread Starter
|
Tuned
Joined: Jan 2013
Posts: 398
Likes: 3
From: Vancouver Island BC
Oddly enough it SEEMS to go away sometimes when you turn the heater from "DEF" to "OFF", but that could have been a coincidence. That would make more sense if it was from the drivers side, I would suspect the A/C compressor.
So my question is, could it be the air pump? I spun it the last time I had the belts off and it didn't feel super smooth, but not horrible either... Possibly the bearings are gone on it? Maybe the alternator, but it seems to be coming from lower down.
So my question is, could it be the air pump? I spun it the last time I had the belts off and it didn't feel super smooth, but not horrible either... Possibly the bearings are gone on it? Maybe the alternator, but it seems to be coming from lower down.
Ideas?!?!?
Postmaster
Joined: Nov 2011
Posts: 3,533
Likes: 17
From: SW Florida
You sure you don't have something stuck in the fan? Trash can make it's way down in there from the cowl area sometimes.
Take the belt off, put some paracord or similar material around the pulley and pull it like a starter rope... if it makes noise then it's junk. Or if it's bad enough you'll feel it grind just by turning it with your hand.
EDIT: when the noise came back was it because you turned the fan back on? If it was still off then it ain't your fan.
Take the belt off, put some paracord or similar material around the pulley and pull it like a starter rope... if it makes noise then it's junk. Or if it's bad enough you'll feel it grind just by turning it with your hand.
EDIT: when the noise came back was it because you turned the fan back on? If it was still off then it ain't your fan.
Thread
Thread Starter
Forum
Replies
Last Post
DDDDDMorgan
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
7
Sep 13, 2016 08:00 AM
TX92F150
1987 - 1996 F150 & Larger F-Series Trucks
7
Sep 5, 2015 05:30 AM
techningeer
1987 - 1996 F150 & Larger F-Series Trucks
12
Mar 25, 2014 11:37 AM
synchro
1987 - 1996 F150 & Larger F-Series Trucks
39
Dec 31, 2010 03:30 PM
Big90250
1987 - 1996 F150 & Larger F-Series Trucks
5
Jul 27, 2004 11:19 AM
