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North Coast Cab's Avatar
 
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Nose Bearing Dimensions

So since I couldn't stop the leak around my nose bearing/crank spot I decided to split the case. To the naked eye it looks like the bearing is undersized or the hole is oversized. The red o-ring barely makes contact with the case surface.


My measurement show the bearing at 62mm and the opening at 65mm. Anyone know the spec dimension for either?

John
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1985.5 944 GTS
Old 03-26-2007, 04:06 PM
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I'm guessing someone used the wrong one. I've got two nose bearings here, the 3.6 is 65mm, the 2.7 is 62mm.


BTW, thanks for careful packaging of the roll bar, looks and fits just great

Last edited by 89turbocabmike; 03-26-2007 at 06:17 PM..
Old 03-26-2007, 06:15 PM
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Thanks. I've got a new one on order and it looks like the 3.0 through 3.6 is the same. Hoping you are right.

John
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Old 03-27-2007, 03:29 AM
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So...anyone have a bearing laying around they could measure for verification????
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Old 03-27-2007, 06:54 AM
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The one I took out of my 3.2 is 65mm.
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Old 03-27-2007, 08:30 AM
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Well, the new bearing arrived and fit like a glove. Unbelievable something like that could be done. I guess next time I buy a freshly rebuilt longblock I'll be a little more careful. $200 worth of sealant and gaskets, $100 bearing and about 30 hours to dissassemble. Hopeing she'll be purring like a kitten, or roaring like a lion, by Sunday.

John
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Old 03-28-2007, 02:10 PM
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John,

The issue you now face is did the 62 mm early #8 main bearing allow adequate supply of oil to the rod bearings for #1,4,2,5 cylinders? I think much passed between the #8 bearing and the case. This may have even lowered the oil to #3 and 6 rods supplied from the #1 main. Doesnít the oil for the #1-2-3 cams pass through #8 supply?

Please look at the big picture.

Best,
Grady
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Old 03-28-2007, 04:47 PM
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I agree, but the motor only ran about 10-12 minutes total and the bearings look fine.
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Old 03-28-2007, 05:34 PM
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John,

Good that no damage was done.

I was concerned that the issue hadnít been brought up and the engine reassembled with potential downstream problems. Good for you.

An important feature of any analysis of even a seemingly insignificant issue is to look at every potential effect of every little bit. Nothing should escape consideration.

Best,
Grady
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Old 03-28-2007, 06:17 PM
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Old 03-28-2007, 06:17 PM
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