75 small block AIR pump

[Ross F.]

I am putting my motor back together and I don't think I have it correctly mounted.
I followed the AIM and all my books, but it still looks funny.

[Edward J.]

Re: 75 small block AIR pump

Ross, is there suppose to be a stud in the lower mounting at the water pump instead of a bolt. It appears your air pump is close to the plastic vacuum sensor. So it would appear stud first, spacer, bracket, locking nut? the stud would give you about 3/16 to 1/4 more spacing.

[Ross F.]

Re: 75 small block AIR pump

Ed,
The assembly manual does not show a stud on the passenger side of the of the water pump.
Plus the way it fastens to the intake wouldnt allow much movement

[Edward J.]

Re: 75 small block AIR pump

Ross, It appears like the front is doing a nose dive? is the vacuum switch against the pump? Maybe another pic. of the opposite side with lower bracket will help.

[Ross F.]

Re: 75 small block AIR pump

Ed,
I will get more photos. you're right though. It does seem to tip forward and sideways. I don't get it, it I all the same stuff I took off.
It is hitting the vacuum switch.

[George L.]

Re: 75 small block AIR pump

Here are a few pictures from my 1975 with the base engine. I hope these help you out.

Thanks,
George

[George L.]

Re: 75 small block AIR pump

Here are a few more. I hope they help you out.

Good luck,
George

[Ross F.]

Re: 75 small block AIR pump

George,

Great pics. That is exactly how mine is mounted as I have C 60 brackets.
There isnt much clearance with the vacuum switch.
I bought belts from quanta. But all of them seem too short.
Do you have the part numbers on your bracket and pulley? Are the number out or towards the pump?

[Edward J.]

Re: 75 small block AIR pump

Ross, If you have a auto parts store near by have them look up the part numbers for you. just to see how close the lengths are to Quanta's belts. The part numbers like Gates uses are the length and width. (such as part no 7545 - 7= 3/8 width, 545 = 54.5 Inchs). Some time GM part numbered belts can be a odd length so they will sometimes use belt that are 54.25 and the after market will use a 54.5 so if you have a AIM bring the part numbers to store with you they can also cross ref. them.

[George L.]

Re: 75 small block AIR pump

George,

Great pics. That is exactly how mine is mounted as I have C 60 brackets.
There isnt much clearance with the vacuum switch.
I bought belts from quanta. But all of them seem too short.
Do you have the part numbers on your bracket and pulley? Are the number out or towards the pump?

I have a P/N on the pulley: 3927116AU

Let me know if you need any further information.


George