Actually, the answer is there in Martin's book - 'the return crank leads the main crank in the forward direction of travel and describes a cirrcle of XX?" Been a long time since I did mine (or been able to find the book for that matter) but if you set it up exactly as it says & centre the valve using conventional methods, you should be just about there. > Before I start, thank you all for your help last time. I have had a couple > of good weeks in the workshop and am just about ready to set the valve gear on > my simplex. Thinking to myself i will have this running on air tonight (why > does it take 20 times longer than you think) Anyway have looked at plans for > about two days and i just Havant a clue where to start. I have had a look at a > martin evens book but sadly it tells you how to design walschaerts gear but > not really how to set it up. So > 1 Where should the return crank be set in relation to crank pin? > 2 What is the procedure for setting the valves? > If this is going to be to complex to write on here could you point me in the > direction of a book, maybe the good dummies guide to valve setting. > I really would like to see my handiwork poor as it is running before xmas > All the best > Keith > > MODEL ENGINEERING DISCUSSION LIST. > > To UNSUBSCRIBE from this list, send a blank email to, > modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line. > MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.