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For my own part, I am still going to give the modified type a try in my own engine first, and will report back once I have done so.Description If you are installing cams, these valve train parts make things go a lot smoother. I would be interested to take feedback from other owners with knowledge in practice - but until I hear anything contrary, will offer both types so anyone wanting to can try for themselves.
This does not seem like a good thing, and on most later design of engines (particularly where taper cotters are used) it is more normal the valve spring top plate is locked to the valve stem. Since starting to acquire old Douglas 2 3/4hp engine parts I have seen a few examples of old worn valves where the top of valve (where the collar sits) is also worn in the same way as a valve stem wears at the line of the valve guide. just a recess for the full circumference - this is now Item 0730 on my catalog.įrom an engineering perspective though - I still think the type with a milled slot to be a better design, in that it holds the pin properly captive - but most importantly stops the valve collar from spinning around the valve. With your advice, I have manufactured another set of collars, but to the original pattern you describe - i.e. However, I only have a couple of manky other originals (hence why I wanted to manufacture new ones) - one of these looks like the slot is less pronounced (or just worn!), and the other still in situ on a barrel, but looks like it is badly worn. That said, I am still not sure the original collar I was working from had not been modified itself, the indent/slot for the pin looks very pronounced, with no other noticeable marks around the recess. Thank you for the update Eddie, it does not totally surprise me - and I appreciate someone far more experienced than I am with these engines in practice, coming back with useful updates.
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