barrel dowel O ring ?

jerry · 10-11-2020, 08:43 PM

some of my manuals show an O ring on the barrel dowels other dont what is best practice

jerry · 13-11-2020, 03:02 PM

well looking at my Genuine Ducati 1998 parts list does not show O ring on front barrel dowel but it does on the rear ,, the Steine Dienst site parts list show barrel dowel with O rings on both cylinder ,, Haynes show them on both but another downloaded manual I have from FF does not show them on either cylinder ??

I think i will put an O ring in just for my own peace of mind

Dukedesmo · 14-11-2020, 09:20 AM

The dowels in the head are hollow and serve as an oil feed from cylinder to head and so are a potential source of leakage, as such I would fit the 'O' ring. More likely to leak than the oil returns IMO as they are under pressure.

As for the oil feed hole from crankcase to cylinder, the rear has an 'O' ring and the front doesn't, don't know if you could fit one either as there is no 'groove' for it. That said I've had mine apart a few times and it's never leaked there - use threebond on the base gasket.

jerry · 14-11-2020, 02:33 PM

Thanks lads ,, all sorted now O rings on dowels all torqued up,, got the paintwork back but still having problem with one of the carbs ,,

10-11-2020, 08:43 PM	#1
jerry Old Git Join Date: May 2006 Location: Cricklade Bike: Multiple Monsters Posts: 2,822	barrel dowel O ring ? some of my manuals show an O ring on the barrel dowels other dont what is best practice __________________ MONSTERMAN

13-11-2020, 03:02 PM	#2
jerry Old Git Join Date: May 2006 Location: Cricklade Bike: Multiple Monsters Posts: 2,822	well looking at my Genuine Ducati 1998 parts list does not show O ring on front barrel dowel but it does on the rear ,, the Steine Dienst site parts list show barrel dowel with O rings on both cylinder ,, Haynes show them on both but another downloaded manual I have from FF does not show them on either cylinder ?? I think i will put an O ring in just for my own peace of mind __________________ MONSTERMAN

14-11-2020, 09:20 AM	#3
Dukedesmo Registered User Join Date: Sep 2010 Location: Leics Bike: M900 Posts: 2,844	The dowels in the head are hollow and serve as an oil feed from cylinder to head and so are a potential source of leakage, as such I would fit the 'O' ring. More likely to leak than the oil returns IMO as they are under pressure. As for the oil feed hole from crankcase to cylinder, the rear has an 'O' ring and the front doesn't, don't know if you could fit one either as there is no 'groove' for it. That said I've had mine apart a few times and it's never leaked there - use threebond on the base gasket. __________________ M900, 916, LeMans II. Last edited by Dukedesmo; 14-11-2020 at 09:22 AM..

14-11-2020, 02:33 PM	#4
jerry Old Git Join Date: May 2006 Location: Cricklade Bike: Multiple Monsters Posts: 2,822	Thanks lads ,, all sorted now O rings on dowels all torqued up,, got the paintwork back but still having problem with one of the carbs ,, __________________ MONSTERMAN