Morning all. Would somebody be able to confirm the depth of the steering head bearing recesses in the headstock? I know the bearing size, but am trying to establish the height of the inner race above the top (and bottom) of the headstock. Any help appreciated. Sent from my P01M using Tapatalk
I didn't measure mine, but IIRC the outer race was a fraction less than the recess - probably the difference between the inner and outer race dimensions.
Thanks Al. You could be right in respect of the top bearing. IIRC, there's a thinnish spacer/washer between the inner race and the dust cap, which would give the necessary clearance steering head to u/s dustcap, but I'm not sure about the bottom one - there's about a 1mm gap between the bottom of the steering head to the large 'washer' under the inner race. This gap must be created by the projection of the inner race below the steering head (and why the bearing gets full of crap) - asking for the dims would allow me to accurately plot it. The next project beckons! Sent from my XT890 using Tapatalk
As far as I can tell by what you say about the bottom one and looking at mine which is the same; there is nothing wrong as such other than the design - the bearing needs some sort of a shroud to cover that gap. But it seems that some taper roller bearings can also have a seal like ball bearings have.
Gentlemen, please excuse me if I have the wrong end of the stick are they not both flush fit in the headstock, or as near as dammit, my old ss frame images:
hejira858, I have just measured mine and the outer race sits below both recesses about 0.8 - 0.9mm probably depending on pain thickness. Have you seen on ebay there are a number of head bearing with the seal I think you are wanting.I bought some skf that did not have the seals but bought some separate. I will see if I can find where I got them from Cheers Gaz
hejira858, I think I got them off the MARKSMAN web site but also see ebay (this is example I have not checked the size of bearing). Seal for taper roller bearings with 47mm OD:32005, 30204, 32005/26 (33-1001) | eBay The i.d had quite a bit of clearance on the spindle so I made a plastic washer (thinner than seal metal disk) to centralise it - this was for the botttom bearing. Cheers Gaz
Thanks all for taking the trouble, and excuse me seeming a bit OCD!. I've been out to look at mine again (gave up waiting for it to stop raining) - the gap between bottom of headstock and large washer below bottom bearing race measures 1.6mm (a) - as the bearing is 16.25mm (b) overall, the bottom of the bearing recess is (b) - (a) = 14.65. As the outer race is 13mm deep (from bearing manufacturers info - all have this dim) this should mean the outer race sits 1.65mm below headstock - more than Gaz's figure, but getting there. Is my logic/maths correct? WAH - looking closely at your pics (thanks), the bottom race does seem to sit into the headstock ( maybe a mil?) whereas the top one looks to sit flush. Sorry to be a bit pedantic, but thinking of using different yokes, and the appropriate bearing is thinner, so would have to add some spacers - just trying to work out exactly what's needed. Sent from my P01M using Tapatalk
Hejira858, Top and bottom sat in same on mine 0.8 - 0.9. Will the thread on the bottom yoke spindle take up a few mm tolerance if you are a bit out, may be a 1mm or 2. Obviously get it as close as you can. Not sure I recall a washer under bottom bearing, I thought mine was just inner race at bottom of spindel and outer race in frame head stock and then assembled, and yes leaving bearing open to the elements Cheers Gaz.
Gaz, Sorry, yokes are from different make (not Ducati) and clearance issues are because of different profile of bottom yoke casting - it would likely run closer to the headstock and the existing steering stops (don't want to remove these in case I revert to standard). Defo a big 'washer' under the bottom bearing - mine's a '96 - don't know when they started fitting them. Sent from my P01M using Tapatalk
My bearings have been replaced at some point years ago, if there were seals/washers in there they were not replaced. As I am rebuilding at the moment I took them out and as far as I can see seals would not be needed as regards dirt ingress, belts and braces I guess.
IMO the gap is caused by the difference between the outer race and the inner race which is slightly proud of the outer.