 What to do with machined bearing cavities? |
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| bkrantz |
 Aug 27 2020, 07:49 PM
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#1
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914 Guru  Group: Members Posts: 8,111 Joined: 3-August 19 From: SW Colorado Member No.: 23,343 Region Association: Rocky Mountains 
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I had my trailing arms sand blasted and powder coated. This has left the cavity for the wheel bearing all clean and fresh--and bare metal. Do any of you treat the metal to prevent corrosion before pressing in the bearing?
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| Krieger |
Aug 27 2020, 11:19 PM
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#2
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Advanced Member Group: Members Posts: 4,759 Joined: 24-May 04 From: Santa Rosa CA Member No.: 2,104 Region Association: None
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I use my favorite Swepco 101 grease.
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| 914forme |
Aug 28 2020, 05:20 AM
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#3
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Times a wastin', get wrenchin'! Group: Members Posts: 3,896 Joined: 24-July 04 From: Dayton, Ohio Member No.: 2,388 Region Association: None
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(IMG:style_emoticons/default/agree.gif) light grease is all you need.
Arm looks wonderful BTW But if the area behind the bearing seat is still fresh metal, I would paint it at minimum, or I would be tempted to get some high temp masking and have them redo the inner area. From the picture it looks like the area the stub axle and C.V. Joint occupies is still raw steel, and that was because of the masking and application. |
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| bkrantz |
Aug 28 2020, 09:40 PM
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#4
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914 Guru Group: Members Posts: 8,111 Joined: 3-August 19 From: SW Colorado Member No.: 23,343 Region Association: Rocky Mountains
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Thanks, Stephen. The picture is deceiving, and the PC goes all the way inside the opening for the stub axle and CV joint. The only exposed metal is in the wheel bearing cavity.
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| sechszylinder |
Aug 29 2020, 02:57 AM
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#5
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Member Group: Members Posts: 256 Joined: 9-April 03 From: /earth/europe/germany/berlin Member No.: 545 Region Association: None
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Hi,
the trailing arms look great! I did this a couple of times, but I‘ve always left the outer shell of the bearing in the cavity while sandblasting and powder coating to protect the surface. Pulling the outer shell after powder coating. Sandblasting is abrasive and I was afraid, that the surface will be damaged resulting in a bad fitting of the bearing. I‘m not quite sure if this really happens, so maybe others could chime in and report their experience here. Answering your question, I would at least put a light coat of grease in there before installing the bearing. Maybe use beforehand some emery cloth to slightly finishing the surface. Benno |
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| sechszylinder |
Aug 29 2020, 03:16 AM
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#6
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Member Group: Members Posts: 256 Joined: 9-April 03 From: /earth/europe/germany/berlin Member No.: 545 Region Association: None
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Hi,
just another remark concerning powder coating. You should definitely free up the mounting surface for the rear brake caliper from the powder coating. Its typically so thick, that the calipers can come loose while rubbing down the remaining powder coating ... Metal on metal is what you‘re here aiming for ... Benno |
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| 90quattrocoupe |
Aug 30 2020, 10:53 PM
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#7
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Member Group: Members Posts: 208 Joined: 4-November 16 From: Long Beach, CA. Member No.: 20,561 Region Association: Southern California |
It used to be when you bought bearing as part of a kit for VAG cars, they came with a small tube of Molybdenum Disulfide paste. Most don't now.
I use this when installing wheel bearings. moly paste Greg W. |
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