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Hi Mauro, When tightening the prop nut the action itself places no tension on the shaft itself. The collet is forced back to the bearing inner which in turn is forced back to the step on the crankshaft - it should have no influence on the rear bearing. Once this is in compression there should...

My apologies Jens - I was not quoting you directly but comenting on what I thought you were implying I agree - the crankshaft is not 'pulled' as such other than by the propeller forces acting in one direction. 'End float' however could be mistrued as free movement which is not the case. If...

Patrick, When Ron Chernich drew these out for MEN I believe he had an example of the original engine to guide him (or dimensions taken from one) The drawings as such - particularly the GA are 'basic' in as much as no tolerance on moving parts are shown. Without checking the complete drawings...

This image may be of interest Patrick - the shafts from the last engines made. You can see the relief on the web and the drawing top right

Hi again, I'm having real computer problems at the moment and things are very slow to load. Having posted I have just been able to see Jens drawing where he shows a slight relief for the inner race on the rear bearing. I don't recall doing this on any of the engines I've built so far but it...

Hello Patrick, Congratulations on starting your new project 👍 Whilst a double ball race front end should have clearance it should not physically 'float' as such - that would mean the rear bearing is to loose on the shaft or too loose in it's housing. It's best to have a small raised area in...

Hi Patrick Welcome to the 'silly grin time' club. Nothing like an engine you've made bursting into life. Really pleased for you - you deserve ten out of ten for perseverence in seeking out the problems too. As I thought - a leakage of air - but didn't consider your c'case seals - these do have...

No need to be sorry Ken, Ian wasn't joking and neither was I though whether it ever comes to fruition is another matter :). Now we really should get back to Patrick's issues - how did that new liner turn out Patrick? Tug

Hi Ken, Ha ha! If the person on Barton is who I think you mean then I'm afraid I'm not able to share the same opinion. In my dealings with both I found George to be very helpful which is not something I can say about the other - 'nuff said on that one! Yes, George was a 'master' at the time...

Hello Ken, Yes I am aware the engine is sideport but last year I spent a frustrating afternoon trying to get a friends Amco 3.5BB to run in a model. It was doing exactly the same thing - fuel drawing up on a choke then running back. Investigation finally revealed that the tube had hardened on...

There is nothing wrong in using diamond paste to lap with but if the parts are unhardened then the particles will remain embedded in the surfaces of both parts. Even thorough cleaning with conventional solvents will not remove these particles quickly leading to a running in and equally fast if...

If you have a bowl type tank screwed directly to the spray bar with the threaded portion covered in fuel then my thoughts are invalid. However the symptom you describe is definitely one of leakage of air into the fuel system. If it will draw the fuel up with a finger choke then the 'internals'...

Hello Patrick, I don't visit here often these days but as a builder of diesel engines myself I always take an interest in others who do and especially if they are having problems. I have read through all the replies, all of which offer good sound advice but I think there may be one small thing...

Hi again James, I am certain I did the original engines from pencil drawings but have just found that at some stage I did these on CAD too so your luck is in. I have attached the first three of ten drawings for you - I replied to your PM - did you see it? By putting them on here then others...

Hello James- it's been a long time since I made those engines and the drawings were laid out on paper. They were featured the build article in the Model Engineer magazine however so if you can source the issues that would be all you need. Regards - Ramon

Chuck - as you know I followed this for a while 'on the other side' Just like to say thank you and John McClelland for these drawings - they are extremely well done and a pleasure to have. Regards - Ramon

You're welcome Chris - it was a pleasure to assist and especially so to see them run at the end despite the small set backs. I've messed around with these little power plants since the age of thirteen but the buzz I got from that Nova when it burst into song was just like that first engine so...

Hi Chris congratulations on another runner and this one far better than the first ;) It certainly sounds how it should and appears to be running well. Thm: If the wrist pin was hardened it looks like it was not tempered through enough -W1 steel ? is that equivalent to silver steel? If so, I...

Hi Chris - first off well done for producing a running engine despite its 'apparent' problems. It sounds and appears however that it may be oscillating which is a sign of over compression and too rich a fuel setting. It will vibrate considerably if it is doing this. If you can't close the needle...

Hi Chris, I may be wrong here, but I don't think you will find these are a commercial item as such. Possibly a cottage industry job or made individually. You could try the MECOA site as members often display engines in a similar fashion. Take a look at the Les Stone page on MEN too as he has...