Technical Tips > Post 84

AIR PUMP

(1/3) > >>

Stingraynut:
I am cursed.

There can be no other explanation - once again my Air Pump has had to be re built.

The full story, except for this latest episode, spans three threads on this forum -
 
The Beginning -http://www.nswcorvettes.com.au/forum/viewthread.php?tid=721#pid1045890006

First problems http://www.nswcorvettes.com.au/forum/viewthread.php?tid=791#pid1045890293

2nd Problems - http://www.nswcorvettes.com.au/forum/viewthread.php?tid=830#pid1045890527

The result of the last fix is that it worked fine for a year. My 88 vette is my daily driver and during that time I did a trip to Brisbane so all up about 4 to 5000kms.

Then recently I noticed the pulley was a bit loose. On inspection it was found that the front bearing had begun turning on the shaft - which is 17mmm diameter - no-one could tell me why a large 40mm OD bearing would prefer to turn on a 17mm thick shaft when it was in good condition with freely moving bearings.
 
After a lot of thought the only conclusion I could come up with was that the shaft was expanding and putting a lot of side force on the bearings - my friend in Brisbane had the same problems with the bearing turning on a hardened shaft, and it was his rear bearing that let go in his re-engineered pump.
 
I wish now I had just bought a replacement GM pump from the US - currently this one has cost me something like $600 - plus the worry and drama's.
 
This time I've had another new shaft made, same big bearings, but the rear bearing is held in with a wave washer, which should allow for a small amount of shaft expansion.
 
The only problem I forsee with that, is the rear bearing may eventually wear a little loose in the housing from moving back and forth all the time - and time will tell, I have my eye on it!!!

Will this piece of cunning engineering lift the curse??
 

S'nut

77CVT:
Dude - just buy an eliminator bracket! ;-)

I hope this time it is fixed for good!

Stingraynut:
I hear you - but I've got my stubborn head on at the moment  !

(there it is -over on  the left)

S'nut

MJ427:
mine did the same on a run recently so i am bowring one of VO till i sought it out

Vette Obsessed:

--- Quote ---Originally posted by MJ427
mine did the same on a run recently so i am borrowing one of VO till i sought it out
--- End quote ---


;41 It was on Stingraynut's car for a while before I lent it to you...  That pump has been around. ;35

Navigation

[0] Message Index

[#] Next page