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Join Date: Nov 1999
Location: Montreal, Canada
Posts: 728
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help needed with I.S. bearings
All my engine bearings came today, all is well except the intermediate shaft bearings. They are slightly different, check out the pic below. My old bearing's part number is 916.137.00 and the new one is 993.137.00. When I asked my parts supplier, he told me that these are the replacement bearings. What do you guys think? The one on the right is my old one.
Thanks
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Mike 03 996tt w/efr7163 89 Carerra 3.6 |
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11-19-2002, 03:07 PM
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Senior Member
Join Date: Feb 2000
Location: Lacey, WA. USA
Posts: 25,310
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The one on the right looks like my old one, except that mine were showing just a little more copper. The one on the left looks like the one I put in.
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Man of Carbon Fiber (stronger than steel) Mocha 1978 911SC. "Coco" |
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11-19-2002, 03:21 PM
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Join Date: Feb 2000
Location: Lacey, WA. USA
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Oops. I guess I should have paid closer attention. One has a hole in it and one does not. What you are showing is one half of a full bearing. Does the other matching new one have the oil supply hole? Does the oil galley supply oil from one side but not the other. I'd guess it does.
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Man of Carbon Fiber (stronger than steel) Mocha 1978 911SC. "Coco" |
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11-19-2002, 03:23 PM
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1-6-2-4-3-5
Join Date: Nov 2000
Location: Seattle, WA, USA
Posts: 212
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That's strange that it wouldn't have the oiling hole, since the case has a oil feed there according to the lubrication diagrams. Of course, in early magnesium engines the shaft ran without any bearings. There's really no load on those bearings and maybe Porsche has determined that oil is better used somewhere else. Hey, if it's good enough for the 993, it should be good enough for your engine. I'd go with 'em and not worry about it.
-zuff |
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11-19-2002, 03:28 PM
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Location: Montreal, Canada
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No, both halves of the original bearing have holes and both new halves don't have holes. ??????
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Mike 03 996tt w/efr7163 89 Carerra 3.6 |
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11-19-2002, 03:29 PM
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Zuff, that's what I thought, judt wanted another, more experienced opinion.
Thanks
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Mike 03 996tt w/efr7163 89 Carerra 3.6 |
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11-19-2002, 03:30 PM
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1-6-2-4-3-5
Join Date: Nov 2000
Location: Seattle, WA, USA
Posts: 212
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WAIT! Studying the oiling diagrams more closely made me go out and look at an intermediate shaft. The engine supplies oil to the bearing on the flywheel end through that hole. The layshaft is drilled, and oil is supplied to the bearing at the crank pulley end by a hole in the layshaft. So, the bearing at the flywheel end should have a hole, and the bearing at the crank pulley end shouldn't.
Check all four bearing halves. I think I'd rather have the hole than not, now that I see it feeds both ends. -zuff |
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11-19-2002, 03:52 PM
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Location: Montreal, Canada
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Actually, you're right again, the flywheel end bearings, new and old, have the oiling hole, whereas the crank pulley end, only the old have holes. I remember looking at the case where the crank pulley end bearings go, and I don't recall seeing any oil holes. Could it be that the old part number was made with the hole for no reason, or a reason other than production car use?
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Mike 03 996tt w/efr7163 89 Carerra 3.6 |
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11-19-2002, 04:05 PM
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1-6-2-4-3-5
Join Date: Nov 2000
Location: Seattle, WA, USA
Posts: 212
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Oh, well then you're good to go! The oil just drains out the side of the bearing into the sump. Like you said, maybe Porsche had an application where they used that oil to do something else, or maybe there was already a bearing design like that with a hole. Who knows?
-zuff |
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11-19-2002, 05:35 PM
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