Air pump delete green belt, how tight should it be?
11-30-2020, 07:34 PM
#16
Rennlist Member
I deleted the air pump on my 79 16V when upgrading my AC.
I got a 21 inch belt from Roger but it seems very loose, I can spin it on the fan pulley. I had Roger send me a 20 inch but I could not get it installed because I was concerned over the amounbt of pressure I had to apply with a pry bar to try to get the upper bolt hole to align and start ( I pulled 1 upper and the center bolt and loosened one upper bolt to get the shorter bolt on).
I am concerned about how loose the 21inch is but not sure if it is normal for an air pump delete.
I got a 21 inch belt from Roger but it seems very loose, I can spin it on the fan pulley. I had Roger send me a 20 inch but I could not get it installed because I was concerned over the amounbt of pressure I had to apply with a pry bar to try to get the upper bolt hole to align and start ( I pulled 1 upper and the center bolt and loosened one upper bolt to get the shorter bolt on).
I am concerned about how loose the 21inch is but not sure if it is normal for an air pump delete.
DRY-4L210K
It originally is meant to be used on a lawn mover ...but serves me well since 5 years now. No cooling problems in summer.
Here is a picture of it on my car :
08-31-2022, 04:55 PM
#18
Rennlist
Basic Site Sponsor
Basic Site Sponsor
Just information:
By removing the air pump belt and the A/C belt, the forces on the crankshaft countering the considerable tension from the alternator belt are now completely gone.
The front main bearing, in your engine, hates you for doing this.
This bearing normally wears on the side where the the alternator belt pulls the crank (even with the two belts on the opposite side) because of the higher tension of the alternator belt.
However, with the two belts removed, the wear on the front main bearing is absolutely insane.....and all the metal that is being "machined" from the front main bearing goes directly to the two front rod bearings.
Incredible as it seems, one must look at the big picture of how things function, before making random changes.....
By removing the air pump belt and the A/C belt, the forces on the crankshaft countering the considerable tension from the alternator belt are now completely gone.
The front main bearing, in your engine, hates you for doing this.
This bearing normally wears on the side where the the alternator belt pulls the crank (even with the two belts on the opposite side) because of the higher tension of the alternator belt.
However, with the two belts removed, the wear on the front main bearing is absolutely insane.....and all the metal that is being "machined" from the front main bearing goes directly to the two front rod bearings.
Incredible as it seems, one must look at the big picture of how things function, before making random changes.....
__________________
greg brown
714 879 9072
GregBBRD@aol.com
Semi-retired, as of Feb 1, 2023.
The days of free technical advice are over.
Free consultations will no longer be available.
Will still be in the shop, isolated and exclusively working on project cars, developmental work and products, engines and transmissions.
Have fun with your 928's people!
greg brown
714 879 9072
GregBBRD@aol.com
Semi-retired, as of Feb 1, 2023.
The days of free technical advice are over.
Free consultations will no longer be available.
Will still be in the shop, isolated and exclusively working on project cars, developmental work and products, engines and transmissions.
Have fun with your 928's people!
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