Engine bearings 900ss

ian900ss

ian900ss

Active member
I have tried to find cheap SKF bearings for the RHS crankcase, awaiting a new left so dont know part nos yet. Im looking for

2nu03EC
6305TN97C3
RNU202ECP
And the main RHP bearing
7307X2TB

Does anyone have any suggestions for where I can get these other than Ducati, it appears they may have been discontinued as I can only find the RNU202 roller bearing for just under £30.
Stiene Dinse dont even seem to do them any cheaper than what Ducati main dealer would be?
 
I already tried their website and they dont come up with most of them, guess I'll need to call. I read elsewhere that some of the bearings have been discontinued and the numbers might be slightly different.
 
Before spending BIG money on TB, precision grad, unobtanium bearings, have a look at this thread on the ducatiforum.co.uk. It seems that Ducati are now supplying ETN, standard grade, bearings as replacements.
 
Ok, cool I did see forth engineerings website, again couldnt find the bearings. I'll pay them a visit then. Derek, I saw that they had changed the main bearing, still appears to be 80 each! Im gonna do them all since I am in there. I also got those cases that you found for me in italy, thanks.

Ian
 
To digress slightly, I'm sure I remember reading somewhere that the works racers used a different bearing. Possibly Roller on drive side and ball on timing. Anybody can confirm this.
 
Ducati priced the main bearings for me, 80 and 72 pounds approx. Not too bad I thought. Will keep hunting to see if I can source cheaper.
 
Serious Black said:
To digress slightly, I'm sure I remember reading somewhere that the works racers used a different bearing. Possibly Roller on drive side and ball on timing. Anybody can confirm this.
Click to expand...

That doesn't sounds right on the face of it - the Ducati mains are angular contact ball bearing on both sides, so that the crankcases can be assembled with a pre-load on the crank. You couldn't do that with a roller bearing as it won't support an axial load.

To the OP, the Bearing Shop is currently stocking main bearings http://www.thebearingshop.co.uk/shop/H1.htm

Hope this helps.

Eddy
 
Eddy, I have called them today as someone on ducatiforum had posted link too. Their website hasnt been updated since 2007 due to a virus so they havent had any in years.
 
Serious Black said:
To digress slightly, I'm sure I remember reading somewhere that the works racers used a different bearing. Possibly Roller on drive side and ball on timing. Anybody can confirm this.
Click to expand...

Never heard of it.

DesmoEddy said:
That doesn't sounds right on the face of it - the Ducati mains are angular contact ball bearing on both sides, so that the crankcases can be assembled with a pre-load on the crank. You couldn't do that with a roller bearing as it won't support an axial load.
Click to expand...
Most British bikes , with the exception of Velocettes, were built with drive side rollers and a timing side ball race. The shaft is located axially by the ball race. Unless there are helical cut primary gears there shouldn't be any axial load. It's because Ducati uses angular contact bearings that they need a preload on the crank.
 
It was absorbed by the NSK group, NTN may well be part of this!

Well i have had many differing quotes now, as for the mains. I can pay top side or find cheaper that's supposedly in spec. I would guess this is where you are finding your great prices.
the original RHP were a precision bearing, you can cut costs with this but do be careful of loadings and speed ratings.
Another one to look out for is the cage material, the originals were a fernolic resin whale brand, i have been quoted for the bronze cage and pressed steel, walked away from the plastic. Even so, the speed rating appear on the limit when quoted SKF.
Just unearthed the 1996 NSK roller bearing book, lets see what the options could be?

Chris.
 
Actually the plastic cages are the ones to go for. The RHP cages are phenolic because they have less inertia than brass. This is why they are rated at 1000rpm higher than their competitors. I think it may be a good idea to see what the latest Ducatis are using and copy that.
 
phenolic, that's the one :banghead: With you on the inertia but the plastic caged bearings unearthed so far have a speed rating of 9000.
Previous threads would show ETN being used over the precision.

Has anyone recently purchased bearings from ducati with manufactures number on the races?

Chris.
 
well done Ian, are you sure thats new? what does new / other mean and why is it not wrapped, sealed, boxed.
I found a couple of bearing suppliers in eastern Europe who claim new stock. Im thinking - this is where all the used items go for refurb that are advertised in the machinery market print we get here.
Im sure you asked questions, did you buy?

Chris.
 
I bought it. Its new just not in a box. Its a reputable seller with excellent feedback that do loads other new old stock bits for other bikes.
 
Wee update, I got one off ebay by sheer luck for over £30 less than Ducati and had to go to Ducati for the other one as They dont appear to be any cheaper elsewhere. As regards the smaller bearings,got a couple of the cheaper ones but there also a few that cost about £20. So I am sourcing from different places to try save some cash.
 
Getting the bearing, seals etc as I find them cheap enough. The seals you can get easy enough the sizes are on the side of them. Some parts I am getting from Ducati as its the only place I can find them or its easier, such as the swingarm seals and wee metal clips. But the bearings i am getting from several different places. Some of them, such as the 6004, 6005 and 2016 needle bearing are readily available for less than Ducati. They are all SKF.

Incidentally to remove them I left the cases on my garage bar heater for a while then used a heat gun to get the individual bearings really hot, then used a bearing puller, bearing drift set or sockets to remove depending on where they were and how hard they were to get at. They mostly came out easy. All removed so clean up cases then onto the next step.....rebuild!
 
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