VALVE TIMING

[T.J.Falloon]

Hello all,

About to go through the process of setting the valve timing on my 1951 Mk1 Sq 4.

I have read Wallers version and Bruce Longmans version of how to set the valve timing and find both of them somewhat confusing and my eyes glaze over.
I know to some I must appear to be a moron, however I find it easier to learn by seeing something being done rather than reading about it. I understand the principle but the execution is what is missing in my mind.
To that end does anyone have a step by step with photos they would be prepared to share with me.

T.I.A

[Eero.Korhonen]

Hello,
What model do you have?
Br, Eero

[T.J.Falloon]

Hi Eero,

I have a 1951 Mk1 Square 4.

[terrychesterton]

You are definitely not a moron. I have a 1953 MKII. setting the valve timing took me a week plus a two hour talk to Mr Longman. getting your head around what has to happen is the key. I doubt very much you will get pics of the event. Mr Longmans system works. My bike is amazing but it took literally four days. I will try to help, but to do so will have to go back to the document.

[T.J.Falloon]

Thanks Terry, appreciate your support.

[KevinOToole]

Just in case you haven't got the Bruce Longman info., it's available at Draganflys https://www.draganfly.co.uk/data/pdf/SQ ... timing.pdf
It took me a while to get to grips with it. To get is spot on, I cut extra keyways in the camshaft sprocket.

[KevinOToole]

By cutting two new keyways at about 120° before and after the original keyway, it gave me a lot of adjustment to get the timing spot on. I should have only had to cut one but couldn't decide which way I needed to go! Obviously these keyways are not exactly 120° out, as the need to give a difference.
Timing mark are now where near!

[john.whiting]

J.A.P V twins have five keyways cut in the timing pinion.

[nevhunter]

And that gives a vernier effect where very small incremental adjustment is available. You can't really TRUST the marks unless they have been verified by a disc . Your cams "degrees" are achieved with a specified clearance also where the ramps are eliminated to make it easier to be precise. Nev

[T.J.Falloon]

Thanks for your input guys. I have been talking to one of our ariel members here in Brisbane, which has been of great assistance. I think I have my head around it, just needed confirmation.