A.I.R. pump help needed
Thread Starter
Pro
Joined: Sep 2002
Posts: 541
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From: Epping NH
A.I.R. pump help needed
I am looking to purchase a replacment AIR pump for my car and am wondering if anyone can answer a few questions. Although I can't remember exactly why, I believe that I have a 72 SB pump in my 69 SB car. It has a black fan and an early style snorkel.
My pump has begun making grinding noises that can be heard while the engine is idling and it goes away when the engine is revved.
I have looked around on the web and have seen several "rebuilt" units available. One claims to fit all cars from 68 to 78 while the other states 72 to 78 replacement.
Are these units generic enough that the diverter/snorkel will fit from 68 onward?? Thanks.
Mark
My pump has begun making grinding noises that can be heard while the engine is idling and it goes away when the engine is revved.
I have looked around on the web and have seen several "rebuilt" units available. One claims to fit all cars from 68 to 78 while the other states 72 to 78 replacement.
Are these units generic enough that the diverter/snorkel will fit from 68 onward?? Thanks.
Mark
Le Mans Master
Joined: Sep 2002
Posts: 5,235
Likes: 898
From: Myrtle Beach SC
I am looking to purchase a replacment AIR pump for my car and am wondering if anyone can answer a few questions. Although I can't remember exactly why, I believe that I have a 72 SB pump in my 69 SB car. It has a black fan and an early style snorkel.
I have looked around on the web and have seen several "rebuilt" units available. One claims to fit all cars from 68 to 78 while the other states 72 to 78 replacement.
I have looked around on the web and have seen several "rebuilt" units available. One claims to fit all cars from 68 to 78 while the other states 72 to 78 replacement.
1969 through 76 used the same diverter valve part number for the small block (GM#7029199). And while 69 used a 7805650 AIR pump, 70-77 called for the same GM$ 7801149 pump assembly whether smallblock or big block...when AIR was called for to meet emission requirements. So, your 69 using a 72 pump makes sense.
Are these units generic enough that the diverter/snorkel will fit from 68 onward?? Thanks.
In the early years, different models were used to squirt different amounts of O2 into the exhaust system but I suspect by the early 70's, engineers figured out how to tune them to the point that one part number was sufficient for all applications.
I dont' know what your looking at paying for the pump, but there are rebuilders. Most likely picking up a unit would be less expensive though
Thread Starter
Pro
Joined: Sep 2002
Posts: 541
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From: Epping NH
thanks for the replies!
I ended up buying a rebuilt 68 to 71 replacement pump from Corvette Central for $81. We'll see how that goes.
I spoke with Jerry MacNeish at Camaro Hi-Performance ( http://www.z28camaro.com/smogsystem.html) the other day and he suggested gutting the pump. That sounded reasonable until he mentioned a $275 fee. I know that he will refinish the unit to like new condition, (he did a beautiful job on my 69 L-46 aluminum valve covers), but for $81, I'll start with the rebuilt unit..
Mark
I spoke with Jerry MacNeish at Camaro Hi-Performance ( http://www.z28camaro.com/smogsystem.html) the other day and he suggested gutting the pump. That sounded reasonable until he mentioned a $275 fee. I know that he will refinish the unit to like new condition, (he did a beautiful job on my 69 L-46 aluminum valve covers), but for $81, I'll start with the rebuilt unit..
Mark
Le Mans Master
Joined: Mar 2004
Posts: 7,457
Likes: 1,483
From: Little Rock AR
I ended up buying a rebuilt 68 to 71 replacement pump from Corvette Central for $81. We'll see how that goes.
I spoke with Jerry MacNeish at Camaro Hi-Performance ( http://www.z28camaro.com/smogsystem.html) the other day and he suggested gutting the pump. That sounded reasonable until he mentioned a $275 fee. I know that he will refinish the unit to like new condition, (he did a beautiful job on my 69 L-46 aluminum valve covers), but for $81, I'll start with the rebuilt unit..
Mark
I spoke with Jerry MacNeish at Camaro Hi-Performance ( http://www.z28camaro.com/smogsystem.html) the other day and he suggested gutting the pump. That sounded reasonable until he mentioned a $275 fee. I know that he will refinish the unit to like new condition, (he did a beautiful job on my 69 L-46 aluminum valve covers), but for $81, I'll start with the rebuilt unit..
Mark
You can just cut some holes in the bottom of the rubber hoses off the discharge of the pump and block the opening in the ends of the trees where they go into the manifold if you want. Nobody will notice and it prevents trashing an otherwise good pump. I did this before and it saves the pump. This also prevents the afterfiring you can get from the system especialy when the diverter valve is shot. No permanant mods and it looks stock.
Send a PM if you need more details.
-Mark.
Thread Starter
Pro
Joined: Sep 2002
Posts: 541
Likes: 5
From: Epping NH
hmmmm
Although I have already ordered a rebuilt unit, I may just give this a try before pulling my existing pump. Thanks for the suggestion.
Mark
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