68 smog pump
Thread Starter
Melting Slicks
Joined: Feb 2005
Posts: 2,145
Likes: 115
68 smog pump
I have a 68 smog pump that I am trying to replace the front bearing on. I managed to take it apart and it appears in great shape except for the front bearing which was trashed. What I found out is that the front bearing is glued in place or injection bolded. There are groves formed in the bearing and plastic is injected into the area around the bearing. So, just wondering how people get around this situation. Do I need to get a bearing with a retainer lip on both sides to keep it in place. It seems like a very special bearing. Thxs
Burning Brakes
Joined: Mar 2014
Posts: 904
Likes: 46
From: Crestline CA
Is there a groove for a snap ring in the housing? Id be interested in pics as the front bearing in my 68s smog pump is starting to get a bit noisy. BTW, as I understand it the bearings are the same as used in a alternator.
Thread Starter
Melting Slicks
Joined: Feb 2005
Posts: 2,145
Likes: 115
Smog pump 68
The pump I disassembled is a dated 68 smog pump. It is in remarkable condition except it was froze up. If you pull the front pulley mount off, you can push the shaft out. But, it is also possible that the hole bearing will press out with the shaft. The shaft is part of a drum assembly that makes up the pump. The bearing has groves in it and he housing also has groves in it. There are holes in the housing that are injected with plastic or glue. Once it is all set up, the bearing is held in place. I would say the pumps were designed just to meet emission standards and get the vehicle out the door. I fail to see how this pump would hold up to 4-5000 RPM rev without spilling its guts and pooping out. I will take some picture with my iPhone and try to post them. It will take me a while because I am heading out the door to get some supplies for the week. But, I will be in contact. Others might like to see the pictures as well. Thx, Terry
Burning Brakes
Joined: Mar 2014
Posts: 904
Likes: 46
From: Crestline CA
I know what you mean about spinning itself apart, thats why I devaned mine, pretty simple, runs quieter and I can only assume easier on the bearings. Hers the link to the threadhttps://www.corvetteforum.com/forums...mp-devane.html
The front bearing set-up sure sounds like a u-joint set-up with injected plastic to hold it together, if it is there may be a additional groove for a cir-clip just for service/repair, hopefully the pics will clarify things.
The front bearing set-up sure sounds like a u-joint set-up with injected plastic to hold it together, if it is there may be a additional groove for a cir-clip just for service/repair, hopefully the pics will clarify things.
Melting Slicks
Joined: Nov 2003
Posts: 2,668
Likes: 119
From: St. Charles Mo
CI 5 & 8 Veteran
tfringo, checkout this thread from days past. It has some good info from Jim Shea. Also some info I dug up regarding new front bearing and its installation.
Air Pump rebuild
Bullshark
Air Pump rebuild
Bullshark
Thread Starter
Melting Slicks
Joined: Feb 2005
Posts: 2,145
Likes: 115
68 smog pump
Yes, very helpful. I was wondering how that inner bearing came out of there. But, I notice the front bearing isn't discussed. I might give Bill Hodel a call and see what he suggests. I bought a system from him years ago. Terry
I know what you mean about spinning itself apart, thats why I devaned mine, pretty simple, runs quieter and I can only assume easier on the bearings. Hers the link to the threadhttps://www.corvetteforum.com/forums...mp-devane.html
The front bearing set-up sure sounds like a u-joint set-up with injected plastic to hold it together, if it is there may be a additional groove for a cir-clip just for service/repair, hopefully the pics will clarify things.
The front bearing set-up sure sounds like a u-joint set-up with injected plastic to hold it together, if it is there may be a additional groove for a cir-clip just for service/repair, hopefully the pics will clarify things.
Thread Starter
Melting Slicks
Joined: Feb 2005
Posts: 2,145
Likes: 115
68 smog pump pictures
Here are some pictures. This is the outer bearing and the front housing.
Last edited by tfringo; Jan 4, 2015 at 06:13 PM. Reason: Goof up
Thread Starter
Melting Slicks
Joined: Feb 2005
Posts: 2,145
Likes: 115
68 smog pump pictures
This shows the grooves in the bearing. They were filled with glue.
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Thread Starter
Melting Slicks
Joined: Feb 2005
Posts: 2,145
Likes: 115
68 smog pump pictures
Pic rear bearing. The rear bearing is situated in the back side of the internal cylinder thingy mic-jigger.
Last edited by tfringo; Jan 4, 2015 at 06:46 PM. Reason: Good up
Thread Starter
Melting Slicks
Joined: Feb 2005
Posts: 2,145
Likes: 115
68 smog pump pictures
This is the cylinder from inside the pump. It holds the pump veins. It also forms the shaft for the front bearing.
Thread Starter
Melting Slicks
Joined: Feb 2005
Posts: 2,145
Likes: 115
68 smog pump pictures
Rear housing cover. The shaft slides through the veins. The shaft is off center. As the internal cylinder rotates, it creates a pumping action with the veins. The veins are inside the cylinder (see other pictures).
Thread Starter
Melting Slicks
Joined: Feb 2005
Posts: 2,145
Likes: 115
68 smog pump pictures
Pump housing. I am only able to post one pic at time. Any ideas?
Burning Brakes
Joined: Mar 2014
Posts: 904
Likes: 46
From: Crestline CA
Okay, now I see what you're working with. Definitely seems like it was never made to be serviced, very similair to a plastic retained u-joint. I think youre best bet is to get a new bearing either by part numbers or dimensions and use some kind in cylindrical retaining compound like loctite 609 or 641. There are actually quite a few choices from loctite and the all have their strengths/weaknesses depending on load(s), temp and initial fit(press/slip). I believe the thread posted by Bullshark gave a bearing part number.