Main crankshaft bearing

Pantah · Post by **Pantah** » Wed Apr 01, 2009 1:24 am

Hi..

What is reference FAG or SKF for these bearings???

Lumpy · Post by **Lumpy** » Wed Apr 01, 2009 6:07 am

I can`t remember the reference number as it`s been years ago since I changed mine. What I do remember however is that I used SKF and SKF make their bearings in 2 grades. There is the standard, which was relativly cheap and then there was the precision grade. Very basically one could spin to higher RPM than the other. The variation in price was huge as I remember and I went to great lengths, even contacting SKF to ask if I could get away with the standard variety. There was some conjecture on the subject and in the end I paid out the extra dollars and went with the precision units. They are still running to this day but who knows, maybe the standard units would have too. If I remember correctly the units that were in there where the precision units as well but i can`t be sure, it was many moons ago.
Be interesting to hear from anyone that went with the standard units and what kind of service they have got out of them.

Pantah · Post by **Pantah** » Fri Apr 03, 2009 10:23 am

Thanks Lumpy..

I have already found out by some of the original manufacturers..that they are angular bearings of 15º.
SkF and FAG has in catalogue of 40º ...

Post by **BevHevSteve** » Fri Apr 03, 2009 4:24 pm

http://shop.bevelheaven.com/detail.aspx?ID=1276

OEM main bearings direct from DUCATI in stock.........

MartinMille BANNED · Post by **MartinMille BANNED** » Mon Apr 06, 2009 3:00 pm

You mean a set of these?

my spare set NOS

MartinMille BANNED · Post by **MartinMille BANNED** » Tue Apr 07, 2009 4:58 am

I think you'd be hard pressed finding a set like these anymore !
I found them by mistake last year , and there staying nice and dry in there seal packets for when the time comes that I may need them

If you do find a set let us know what they cost you , post or PM
cheers Mate

MartinMille BANNED · Post by **MartinMille BANNED** » Wed Apr 08, 2009 2:12 pm

So my, NOS RHP's are worth there weight in gold ?
Not bad for an outlay of only AU$140 or US$99 just last year November !!!!
There definitely keepers now

Pantah · Post by **Pantah** » Fri May 08, 2009 12:21 pm

Cage of the bearings removed from my engine(900SS/80)
MRC 307 R ( R= Angular 15º)
This bearing is of 12 balls and phenolic resin cage.

The part broken of gave off when removing them,I have appreciated a fragile texture surely caused by the temperature during all these years.
Perhaps 28 years ago the phenolic resin was the best thing ...after seeing the state of my old bearing I am convinced that there am right when trusting the present materials(polyamide).supporting better to the temperature and the years...angular to 15º,evidently...

MartinMille BANNED · Post by **MartinMille BANNED** » Fri May 08, 2009 2:39 pm

Although the cage is old the cracks are new , I have removed several bearings of this type and have never broken a cage during the process all I can say is you sure must have given it some force to cause this damage and I doubt that if the bearing cage was left in its holder with balls that this damage would ever occur as the rolling forces are very much different to those of side way removal forces

Pantah · Post by **Pantah** » Sat May 09, 2009 12:33 am

Hi Martin.

it was removed with the same force and gentleness that the second bearing..the second left without damages.

"I doubt that if the bearing cage was left in its holder with balls that this damage would ever occur as the rolling forces are very much different to those of side way removal force"

I agree in the theory....

MartinMille BANNED · Post by **MartinMille BANNED** » Sat May 09, 2009 12:47 am

'
HMM

I still don't see any old wideness marks at all only new ones , if the marks were old they would appear dark in color

Pantah · Post by **Pantah** » Sat May 09, 2009 12:58 am

it is certain...but the material is so fragile that I can divide it with a minimum force of my fingers.
I have removed to a bearing from a motor pantah with polyamide cage.. there am separated the cage of the balls and it has been impossible to cause some damage to me to the cage with the force of my handsthere .
The engine partah is of the 82. .2 years of difference with the motor of my 900SS..