Plastic pump gear?
Posted: Thu Aug 03, 2017 1:47 pm
Hello all,
It's been awhile since I posted anything on my long rebuild of a '71 350 frame and engine, the engine having been built for racing and then put on a shelf never having been run. It's pretty well done now, as shown in the pic (polished aluminum fenders have been added since then), and I've been diligently working out the carburetor situation since the thing came with a brand new 34mm smoothbore Amal that I chose not to use for a street application. I've almost homed in a 32mm Mikuni configuration, still a tad rich, working my way through JetsAreUs jets. The event that prompts this post is that as I was starting off to work the other day (my first actual functional application of the bike) and after about 100 yards the bike just shut off, not to be restarted. Pushed it home and after inspection that night, there was no spark, and I tracked it down to the Sachse ignition module not firing. Pulled the cover and the unit was lit up, but the rotor shaft wasn't spinning as the engine was kicked over! Further disassembly revealed that the oil pump gear had disintegrated - it was plastic, old and brittle at that.
I've found an NOS gear (metal) in France and it's on it's way, but my question is what possessed Ducati to put such a thing in there? It seems like all the other gears that I've been able to find are metal. I'd have to also question why the folks that built the race motor (the former Europarts in Florida), after putting a lot of very expensive other parts in the engine (which had been running really well to this point) left an old plastic pump gear in it?
I guess I'll be looking for all the gear train alignment links here soon...
Regards,
Jack
It's been awhile since I posted anything on my long rebuild of a '71 350 frame and engine, the engine having been built for racing and then put on a shelf never having been run. It's pretty well done now, as shown in the pic (polished aluminum fenders have been added since then), and I've been diligently working out the carburetor situation since the thing came with a brand new 34mm smoothbore Amal that I chose not to use for a street application. I've almost homed in a 32mm Mikuni configuration, still a tad rich, working my way through JetsAreUs jets. The event that prompts this post is that as I was starting off to work the other day (my first actual functional application of the bike) and after about 100 yards the bike just shut off, not to be restarted. Pushed it home and after inspection that night, there was no spark, and I tracked it down to the Sachse ignition module not firing. Pulled the cover and the unit was lit up, but the rotor shaft wasn't spinning as the engine was kicked over! Further disassembly revealed that the oil pump gear had disintegrated - it was plastic, old and brittle at that.
I've found an NOS gear (metal) in France and it's on it's way, but my question is what possessed Ducati to put such a thing in there? It seems like all the other gears that I've been able to find are metal. I'd have to also question why the folks that built the race motor (the former Europarts in Florida), after putting a lot of very expensive other parts in the engine (which had been running really well to this point) left an old plastic pump gear in it?
I guess I'll be looking for all the gear train alignment links here soon...
Regards,
Jack