bearing behind alternator has broken on 696

[grumpyman]

speedog
when the alternator was removed in the hunt for the noise, the bearing directly behind it was the one that had failed

[ducpainter]

What parts costing $700 are required for that repair?

[BK_856er]

Here's a pic from my M695, which should be similar to your setup.

Presumably the red arrow shows the failed bearing location?

When you say it "broke" do you mean the race cracked?

BK

[brad black]

the arrowed bearing is the main bearing.  i was expecting he is talking about the bearings over the crank next to the timing gear.  the one that the starter driven gear sits on.  but his explanation is not clear.

[ducpainter]

the bearing inside the case behind the alternator
it is not a main crank bearing but is driven by the crank and is inside the case
apparently it is easy to install it slightly off true
i am going to find out more tomorrow but to find my claim was denied over an issue that DNA know is a design flaw is infuriating
i had to work today but am going to call them directly on monday

Here's a pic from my M695, which should be similar to your setup.

Presumably the red arrow shows the failed bearing location?

When you say it "broke" do you mean the race cracked?

BK

He said it wasn't a main bearing.

[BK_856er]

He said it wasn't a main bearing.

Yes, obviously I missed that post on the previous page.  Sorry for the confusion.  Was trying to wrap my head around what was going on "behind" the alternator.  Looked up the parts diagram and I get it now.

BK

[grumpyman]

sorry for the confusion there
as it was explained to me there is a bearing directly behind the alternator through which i believe a shaft passes
when my mech removed the alternator the inner race/cage of that bearing had broken leaving only the outer race still in the motor
i will post up pix once i pick it up from the dealer
if i cannot get DNA to help on the repair it will be sold as is or parted out here in the sf/bay area

[ducpainter]

sorry for the confusion there
as it was explained to me there is a bearing directly behind the alternator through which i believe a shaft passes
when my mech removed the alternator the inner race/cage of that bearing had broken leaving only the outer race still in the motor
i will post up pix once i pick it up from the dealer
if i cannot get DNA to help on the repair it will be sold as is or parted out here in the sf/bay area

I'm thinking the starter sprag bearing

[grumpyman]

this is part of the cage

[grumpyman]

[grumpyman]

apparently it is a main crank bearing
they are giving me this part number 70240931A
and these were the parts removed to get at the failed bearing
the plastic cage in my hand was part of what came out that should not have
the high cost of this repair is that you have to split the cases and then replace a lot of bearings and it is a lot of labor
i did finally manage to talk with someone at ducati north america today and was told that it was out of warranty
i asked the guy i talked to to send my request higher up the food chain as my view is that a failure of this kind to a low miles bike that has not been abused and has been maintained is just not acceptable

[grumpyman]

i now have the answer as to why a main crank bearing failed
ducati has been using the same crank bearing with a steel sleeve since 1974 in pretty much everything
on the newer bikes they switched to a cheaper slightly larger bearing that eliminates the steel sleeve
the new bearings have less bearings and are more prone to failure
this is what bit me in the ass on my wifes 696
the shop that is doing my rebuild uses the older bearings when they do crank bearings/rebuilds and chuck them out on any race motor they build

we are going to pay to rebuild this bike as my wife likes it but i still think ducati should be giving out bearings to cover their stupid engineering descision

[stopintime]

the shop that is doing my rebuild uses the older bearings when they do crank bearings/rebuilds and chuck them out on any race motor they build

Kämna, who did my engine, took a quick look at that same bearing - shook his head, made a nice 3 point throw into the garbage bin and called Ducati on his hot line, but not even he is capable of getting Ducati to admit engineering mistakes. Ducati's supplier of these poor bearings went out of business and Ducati sent Kämna three new bearings to choose from. Budget decision for which customers are paying the price - not the first, or last, time I'm afraid.

[Speeddog]

Old bearing is 751913380, shown as a 35x72x17 bearing, and is a standard size angular contact bearing, a 7207.

New one is 70240921A, shown as a 35x78x19, a bastard size AFAIK.
They started using this new one in ~'07, and it's used on the 1098 motor......

[grumpyman]

my info is that they went back to the old bearing in the new big bikes

i did call them today and told them i was pissed that their stupid bearing is gonna cost me 2 grand to fix

if you gotta split your cases throw the old bearing in there while your at it