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<blockquote data-quote="oexing" data-source="post: 118431" data-attributes="member: 1493"><p>Basically this is no Ducati forum but even so I´d like to share my feelings about some problem spots: Oil quality is most likely not the biggest factor in roller big ends, though high viscosity helps a bit, in gear boxes too. But then warming up the engine is critical and no high speeds while cold are recommended, with single grade even more so. </p><p> Hardness of Duc conrod and crank pin are to specs , most Japanese singles got same type of conrods case hardened, be it SR 500, Honda radial four valve types etc. . A pressed in bearing race does nothing for ruggedness of the big end so I made my own conrods from chrome-nickel case hardening steel like these too. BUT big factor seems to be the bypass oil filter with the 860 and 900 cc Ducs so when dirt goes through the roller bearings in there all faces in conrod and crank pin will develop tiny surface defects that get worse in use and fail in 30 000km intervals . Later types had pins from 36 mm go to 38 mm and I believe the oil filter was changed to full flow, cannot tell. Even later types and all belt types got plain bearing cranks to cure this trouble spot - but got other worries - well, Ducati all the way. </p><p> Don´t know about crowded needle bearing in Duc gearboxes, basically this is a very high load design and used in many car gearboxes too. I was thinking the stuck 4th gear my friend Max had in Finland was due to running a steel gear on a steel shaft direct, no bushes there. But then, same type in Vincent gearboxes, needs decent clearance I suppose ? A good idea is to fit drain plugs with neodym magnets in all suitable places, takes out amazing wear deposits at no cost - and is a diagnose feature as well. </p><p></p><p> Vic</p><p>home made Vincent conrods with INA 40-48-20 mm bearing</p><p>[ATTACH=full]33014[/ATTACH]</p></blockquote><p></p>
[QUOTE="oexing, post: 118431, member: 1493"] Basically this is no Ducati forum but even so I´d like to share my feelings about some problem spots: Oil quality is most likely not the biggest factor in roller big ends, though high viscosity helps a bit, in gear boxes too. But then warming up the engine is critical and no high speeds while cold are recommended, with single grade even more so. Hardness of Duc conrod and crank pin are to specs , most Japanese singles got same type of conrods case hardened, be it SR 500, Honda radial four valve types etc. . A pressed in bearing race does nothing for ruggedness of the big end so I made my own conrods from chrome-nickel case hardening steel like these too. BUT big factor seems to be the bypass oil filter with the 860 and 900 cc Ducs so when dirt goes through the roller bearings in there all faces in conrod and crank pin will develop tiny surface defects that get worse in use and fail in 30 000km intervals . Later types had pins from 36 mm go to 38 mm and I believe the oil filter was changed to full flow, cannot tell. Even later types and all belt types got plain bearing cranks to cure this trouble spot - but got other worries - well, Ducati all the way. Don´t know about crowded needle bearing in Duc gearboxes, basically this is a very high load design and used in many car gearboxes too. I was thinking the stuck 4th gear my friend Max had in Finland was due to running a steel gear on a steel shaft direct, no bushes there. But then, same type in Vincent gearboxes, needs decent clearance I suppose ? A good idea is to fit drain plugs with neodym magnets in all suitable places, takes out amazing wear deposits at no cost - and is a diagnose feature as well. Vic home made Vincent conrods with INA 40-48-20 mm bearing [ATTACH type="full"]33014[/ATTACH] [/QUOTE]
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