: A.I.R. Pump removal

09-13-10, 09:26 AM
My 68 AiR pump is dead and most of the lines are dried out. Anyone already remove theirs? What belt # did you use. What did you plug the Heads with, any other tips? Suggestions?


Angry Matt
09-13-10, 07:40 PM
I removed mine on my v6 car so I can't help with the belt #, but I can tell you that I prefer the way it drives without all the emissions crap on it. I just cut the line about an inch from the heads and used rubber plugs I found in my shed. Since you can't see them behind the motor I wasn't too concerned with cosmetics.

09-13-10, 11:35 PM
if you search the threads there was one which stated which size freeze plug fits the heads perfectly but one does. Also you have to change the pulleys on the car because that belt's adjustment is the air pump itself. I don't know what you change the pulleys to though.

09-14-10, 12:23 AM
425 pulleys, no smog. I think the plugs are 3/4 but I can look if you need me to.

09-14-10, 12:55 AM
I know the pulleys of a 1970 Cad will for sure work. Check this site, I know they sell the stuff you will need.


If I ever get another 472-500 done, i am having them do it. They talk the talk.

09-14-10, 11:57 AM
I am as dumb as a box of hammers. I can do anything I have instructions for, but to do abstract thought and figure it out on my own, forget it. What do you mean about the 425 pulleys.

Your right YMP, I did I did not even think about that adjustment.

Could I will remove the body of the pump, keep the pulley for adjustment, and plug everything off.

I read this, but I don't quite get what he means.

Re: Cadillac 472 emissions removal
... to get rid of the smog pump you need to change the crank and waterpump pulleys...get them off a 1977 to 79 cadillac 425 motor... they will bolt on ...only 2 belts are needed... with the set-up you have now , if you leaveoff the smog pump nothing turns the waterpump or alternator

09-14-10, 05:05 PM
yea you can just gut the pump if you want and use it like that.

To the best of my knowledge you have to find a 1977-1979 425 engine and take the pulleys off that and swap them with your current ones. I guess those have some kind of adjustment on them that ours do not have. (They will also use less belts) Also if you find a 472 engine before they started using the AIR system those should work as well but I don't know what year they started using it though or what the exact difference is. I would like to get rid of the air system on my 1973 as well.

09-14-10, 05:23 PM
as far as I know 1968 is the first year of the 472 so they all had the A.I.R. Pump.

09-14-10, 07:36 PM
the one guy said a 1970 didn't have it?

Angry Matt
09-14-10, 08:56 PM
Correct, 1970 does not have it.

09-14-10, 09:43 PM
so is it only the 1970 or did other years not have it?

09-15-10, 12:07 AM
so is it only the 1970 or did other years not have it?

Yes, of the 472-500 engines the '70 is the only year that does not have an air pump.

09-17-10, 09:31 AM
So what do they use to adjust the belts on your 1970?

Has anyone here done the switch of their 472 pulleys with 425 that could walk me through it?

09-17-10, 12:07 PM
The alt adjust that belt, the power steering to tighten the other. There is a pic in the 500 build thread of the 425 pulley setup without the ac. One belt for alt, one for p/s.

09-18-10, 09:25 AM
csbuckn, I can't find that post anywhere.

My 68 has AC as well.

09-18-10, 09:40 AM

Post 98. The alt belt isnt on but it goes from the crank pulley to the alternator. Since you have AC, the other belt would go from crank, up to AC, over to powersteering and back to crank(simular to what you have now).

09-18-10, 10:08 AM
Yes, of the 472-500 engines the '70 is the only year that does not have an air pump.

excellent, I just feel better and better in my choice of vintage... ;)

09-29-10, 11:59 AM
So I am looking for a crank pulley, a single power steering pulley, and what else?

You don't also happen to know the belt #s required?

09-29-10, 07:33 PM
Could you still use the double belted pullies and remove the air system and just run whatever longer belt is needed for the alt?

10-01-10, 02:48 PM
Are you asking me? I am incapable of abstract thought.

Anyone here with a 1970 472 with AC that can give a run down on how your belts are set up.

Pictures would be great as well.

10-06-10, 01:01 PM
No, the '68 472 has three belt grooves on two pulleys attached to the crank. The double inner crank pulley goes to the AC, and PS pump (the tension point). The single outer pulley attached to the double crank is smaller and goes to the A.I.R. pump (the tension point) the water pump. The Alt (the tension point) also goes to the WP. But the A.I.R., if removed, allows no way for the WP and Alt to turn, because that belt would be impossible to attach.

Anyone here with a 1970 472 with AC that can give a run down on how your belts are set up? A copy of the 70 manual, a picture, etc?

The A.I.R. pump is rattling now so I am afraid of it seizing up, if it does I am SOL. And you know it will do it at night, in the rain, in the middle of nowhere.

10-06-10, 01:57 PM
Can you just get a shorter belt that would eliminate the smog pump?

10-06-10, 03:07 PM
The smog pump is the tension point. So there would be no way to get a belt loose enough to slip over the crank pulley and WP pulley and then tighten it.

That's the dilemma.

That is why I need to see how a 1970 472 with AC is set up. No smog pump.

10-06-10, 04:22 PM
Just call Marty at MTS(a Cadillac performance company) to save a lot of hassle. He helped a lot with my pulley hassles. I have a crank pulley and power steering pulley from a 425 setup so if he says they will work, I'll ship them your way.


10-07-10, 12:41 PM
From the man himself at MTS :bouncy:

Within a week or two we should have a smog pump removal kit for your engine. Price will be $169.95 and will include all parts, belt and hardware you need.

Back off till I get mine. :stirpot:

10-08-10, 11:21 AM
i'm curious to see what the kit has in it.