Showing posts with label needle bearing. Show all posts
Showing posts with label needle bearing. Show all posts

Tuesday, November 3, 2009

Ducati Needle Bearing Disaster: Part Two

In theory replacing the clutch slave, pushrod, and pressure plate is an easy job, but putting in a new needle bearing is a tad bit more difficult. Good luck finding a bearing puller that is small enough to fit inside the bearing—I ended up grinding down the claws of my bearing puller to make it fit. Unfortunately, the bearing internals came out, but the casing did not. I tried a blind hole bearing puller with no luck either. In a moment of desperation, I used a 7/16 tungsten carbide burr to shave away the sleeve. Luckily, the burr knocked the sleeve loose, and I was home free.

The new bearing slipped right in, and with the new pushrod, slave, and pressure plate I bled the clutch. For some reason I ordered a pre-2000 pushrod, which is shorter than the newer ones.Oberon was nice enough to supply spacer so that I could use the new slave with the pre-2000 pushrod. But, even with the spacer the slave was reaching the end of its travel before disengaging the clutch. I used a section of the old pushrod as a second spacer—and it worked!

After a quick test ride, everything seemed to be holding up nicely. My only complaint was that the friction zone of the clutch was at the very beginning of the lever travel. I must have made the second spacer too long. Instead of shortening the spacer, I shimmed the slave off the case cover using 2 thin washers on each bolt.

First impressions of the Oberon slave are excellent, but I will have to wait until spring to fully test it.





Saturday, October 24, 2009

Ducati Needle Bearing Disaster: Part One

Traveling down the highway after a long day in the canyons, I prepared myself for the exit onto highway 14. It’s a tight, slightly banked, second gear turn. I started braking from 85mph to 40mph, grabbed the clutch and nothing. It was hard as a rock. I blipped the throttle,

downshifting without the clutch, and somehow managed to avoid crashing. The clutch worked intermittently as I limped home, then finally gave up the ghost about a mile from my 5-by-10.

The disassembly of the clutch revealed quite the mess. The slave cylinder is fried, the seals are blown, and the bearing that is supposed to keep the pushrod from spinning is filled with metal flakes. On the clutch side of the bike, the needle bearing is missing several rollers, and the pushrod is chewed up.

New parts on the way:

-Oberon slave cylinder

-Pushrod

-Paulimoto pressure plate

-Main shaft needle bearing

-Various o-rings, etc.

Such is the life of a Ducati owner. Stay tuned for the fix…hopefully before it snows.