OB air pump bearing
Thread Starter
Instructor
Joined: May 2015
Posts: 231
Likes: 13
From: Uganda, Baltimore, PNW, italy
OB air pump bearing
I am in the process of pulling the engine on my 1979.
one of the first things I. Noticed was that the bearing on the air pump is shot. I have disconnected the pump itself, but still need it in place to balance the load on the crank snout.
Are these things rebuildable, or do they have to be replaced?
one of the first things I. Noticed was that the bearing on the air pump is shot. I have disconnected the pump itself, but still need it in place to balance the load on the crank snout.
Are these things rebuildable, or do they have to be replaced?
Nordschleife Master
Joined: May 2012
Posts: 5,244
Likes: 441
From: Thousand Oaks California
They're rebuildable. I just send it off to a proper rebuilding shop to have the work done. The bearings inside are a common size but their specs escape me....
You can run without it for a while, it won't do any real short term damage.
You can run without it for a while, it won't do any real short term damage.
Archive Gatekeeper
Rennlist Member
Rennlist Member
Joined: Sep 2002
Posts: 18,844
Likes: 4,041
From: Irvine, CA
There are six bearings, one B-188, one 6203, and four J-65's. About $50 just for the bearings. But the complete R&R is a fiddly process, and it's hard to get it reassembled without getting the front and rear bearings in the right plane axially after pressing on the pulley mounting plate. Get it wrong and the thing makes a lovely scraping noise. My batting average on being successful is only about 50%. A rebuilt from 928Intl is a sure thing for $259:
http://shop.928intl.com/Rebuilt-Smog...28-113-109-04/
http://shop.928intl.com/Rebuilt-Smog...28-113-109-04/
Thread Starter
Instructor
Joined: May 2015
Posts: 231
Likes: 13
From: Uganda, Baltimore, PNW, italy
The more threads I read about this, the more Im tempted to leave it off. My AC clutch froze long ago, so there is not a belt on it.
The car is moving to The Olympic Peninsula in Wa, where there are no emission tests, so I dont really need either the smog pump or AC. Do I really need to worry about uneven loading on the crank if both ate deleted?
The car is moving to The Olympic Peninsula in Wa, where there are no emission tests, so I dont really need either the smog pump or AC. Do I really need to worry about uneven loading on the crank if both ate deleted?
Burning Brakes
Joined: Jan 2019
Posts: 770
Likes: 106
From: Dallas
Scott,
My opinion is that removing the smog pump is fine. Others have different opinions. See this thread:
https://rennlist.com/forums/928-foru...og-pump-3.html
I will reiterate my reference to a Greg Brown quote in post #34: "If the air pump belt load has any affect on the main bearings, you've got other problems."
-Jason
My opinion is that removing the smog pump is fine. Others have different opinions. See this thread:
https://rennlist.com/forums/928-foru...og-pump-3.html
I will reiterate my reference to a Greg Brown quote in post #34: "If the air pump belt load has any affect on the main bearings, you've got other problems."
-Jason
