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Join Date: May 2005
Location: Christchurch, Zealand
Posts: 21
Angry Number 8 bearing aligned bored !

Hi all,
My machinist who aligned bored my 2.7 3R case also aligned bored my number 8 bearing journal out to .25 !

I am told you cant purchase number 8 bearing oversized.

What are my options ?? Apart form scrapping the case.

The shop i sent it to told me they have done quite a few align bores, then i found out the guy who done the job was his first align bore on a 911 case.

Ive gone back to the shop and they apologized and said they will sort it, but I'm worry how they will sort it out.

Cheers

hayden
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Hayden Pearce
Old 10-13-2005, 06:07 PM
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Henry Schmidt's Avatar
 
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I have not tried to buy an oversized #8 main lately but they did make them.
I might even have one.
Email me on friday and I'll see if I have one. If I don't I'll try to find you one.
Cheers
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Old 10-13-2005, 06:20 PM
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Main bearing kits with #8 #911-101-901-60 std id .25 over od. I checked the price just the other day for a 3.0 # 964-101-901-61 .25 over $823.14 from U.S. Porsche dealer, 4 weeks to get.

Good luck, I would have the shop pay for a case, or the bearings.
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Old 10-13-2005, 06:22 PM
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Quote:
Originally posted by speedkillz
.......... I would have the shop pay for a case............
Let's try to fix the problem not the blame.
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Old 10-13-2005, 06:46 PM
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Thanks,
i'll have to email you next week, as its friday here already and im away for the weekend

hayden
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Old 10-13-2005, 06:57 PM
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I too would have the shop get you a new case OR buy the oversized bearing.
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Old 10-13-2005, 06:58 PM
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Hi Hayden,

I had my case line-bored by Porsche Centre Melbourne here in Australia, and they supplied all the oversized bearings including the No 8. Cost for the oversized No 8 was $239.
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Old 10-14-2005, 12:36 AM
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It never ceases to amaze me how quickly people with very little knowledge accuse professionals of being in error. Take a deep breath, count to ten and look at the reality before you lynch this guy.
The shop did not error in boring that bearing. Lets all keep in mind that the number 8 main bearing in a mag case ( HE DID SAY 2.7) almost always needs to be bored and historically the only reason not to bore it is cost saving.
I rarely see a mag case where the # 8 journal is round. I have measured this journal at over .015" out of round. Even after machining the case halves and line boring it back to standard we often see that this area is not completely symmetrical. I built a 3.0 911 SC engine for Beck's Porsche that had a case that was .018" out of round. That is the main reason for assembling the case with using a larger oring or glue around the number 8 main when the factory manual specifically says no glue .

BTW: The shop already said they would make it right and in fact they did.

If the factory had not meant that journal to be bored they would not have made the bearing available.

I must correct myself: "I said the only reason for not boring the # 8 journal is cost" but I just remembered that some early line boring tools used a sleeve in the #8 journal to hold the tool.
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Last edited by Henry Schmidt; 10-14-2005 at 07:11 AM..
Old 10-14-2005, 04:34 AM
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Just so you know what can happen with a 2.7 and bore ovality...
Rear Main Seal Hell

Have a look at page 2 and what I had to do to fix my problem. At least mine was a seal, not a bearing.

In the end the machinst might have done you a favour.
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Old 10-14-2005, 04:40 AM
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Back to the reason for the post:
fixing the problem, not the blame.

I checked stock and I have a good used bearing.
call or email and we'll work it out.
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Old 10-14-2005, 04:57 AM
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Verry interesting, as usual, Henry.

Now I'm wondering how many rod failures can be attributed to oil loss here?

Could be significant..

BTW, in a pich, it would be easy to turn a new one from ali..which should work well..

Kind regards
David
Old 10-14-2005, 07:23 AM
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My feeling is that not much oil pressure is lost through this location. Who knows?
As for machining a later bearing, it seems to me you could do this if the oil holes near the perimeter leave enhough material to allow for that much material removal.
It looks to be close.

Good thought, might work..
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Old 10-14-2005, 07:54 AM
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