How to Adjust Desmo Valve Clearance - Back to Classics
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- čas přidán 15. 03. 2023
- How to Adjust Desmo Valve Clearance - Back to Classics
In our second video in a series of tutorials, we discuss setting the valve clearance on Ducati bevel-drive twin desmo engines. Harné will talk you through how the clearance on the closing and opening rockers of the Desmo system are set and adjusted using an assortment of shims.
Parts for adjusting the valve clearance on your classic Ducati can be found here: www.ducaticlassics.com/parts/...
Tools you might need to the this job can be found here: www.ducaticlassics.com/shop/t...
And if you like the t-shirt Harné is wearing in this video, these can be found here: www.ducaticlassics.com/shop/c...
We hope this video gives you a good idea about how to approach this job. Let us know if we can help you any further of course. Thanks for watching this episode and see you soon at Back to Classics!
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When shimming the closing rocker you have to rotate the cam all along the high part of the lobe, because the lobe may have a high spot. Zero clearance means a barely perceptible drag can be felt as you rotate the cam. This has to be done one rocker at a time (pull the 1st rocker you shimmed out before setting the 2nd, then reassemble both). Also, the vertical bevel shaft should be removed so you won't feel friction from it when performing this check, and the cam bearing end cap has to be installed, with all 4 screws tightened to get a truly accurate setting. Opening rocker clearance should be done in a similar fashion, checking for the high spot on the base circle of the opening lobe.
OMG love this channel SO MUCH !
Thank you again for sharing the content. Really enjoy it. Quality stuff.
.. also delighted to see subscriber numbers increase over the time since launching.
Cheers from Wisconsin !
Definitely interesting. It was a lot more work (and that was only half of the work to set them all) than I imagined it would be before watching the vid. Thanks for sharing.
" This is a hedious job...." Also sprach Zarathustra.
This reminds me not to bother to try this myself. Thanks for a great video.
This is very professional and helpful. Well done!
Love the way you explain the technical stuff very interesting and keep up the great work 👍
Very interesting and well presented as always 👍
instead of shims for closing lobe, it would be better to use very flat spings or silicone rubber shims so the closing tolerances will be less critical.
I guess it would be really hard to film otherwise, but your hand obscures what's going on for most of the video.
Is there a rough milage the rocker gaps should be checked? Or is it just by how much you can here the tappets?
Our experience is that the more the engine is run, the better it stays within spec. However, we advise to check the valve clearance every major service or at least every 10000km. After a fresh rebuild (new valves and seats) we advise to check after 1500km, than again after 5000km.
Where can i get the shim end of the closing rocker resurfaced. or built up and resurfaced. thanks.
Try MBP (Guy Martin) in Pointe Claire, Quebec (sorry, don't have his e-mail/website handy).
The hand obstructed almost every major step
Is the ratio of the rocker arm "arms" 1/1 ??
On the bevels, it's not quite there. The valve opens more than the lift on the cam.