Engines > Restoration of Model Engines
Maiwald Makeover........
dsquire:
David D
--- Quote ---I'm not too sure about spectacular....... But, I do try to provide an interesting climax! :whoohoo:
--- End quote ---
That should be interesting! Might is be :censored:
Back on topic here. It is looking good David. I have been watching silently in the background. It will be a nice one when it is finished.
Cheers :cheers:
Don
lazylathe:
Hi David,
Looks good so far!
Does it have a leak by any chance?
That swarf you found might have wore out the displacer bushing?
I have been known at times to use a slightly thicker oil on the displacer rod to ensure a good seal. :censored:
If i know you at all the next time i log in it will be chugging away... :D
Love all the upgrades you have done!!
Andrew
Stilldrillin:
Hi Don.
Ok. No more might be's...... Mebbe! :thinking: Thanks for your confidence in my rebuilding. :cheers:
Hi Andrew.
Thanks. Steady as we go.......
Leaks? Well........
I've covered up the power piston bore, and sucked on the displacer bearing, attaching it to my tongue, for as long as I could manage. Nowt wrong there! :ThumbsUp:
The displacer shaft is a really good sliding fit in it's bush. Feel, I'm missing something, somewhere..... :shrug:
------------------------------
Well, here we go again........
After the fail, it was water tested.
No dramatic bubbles, but, some water inside, on stripdown. :thinking:
Calculated the ratio..... That's ok at around 6 to 1.
I really don't like the pifflin', (out of square?), crank throws. So, I started to make another assembly.........
Then the tiny big end bearings arrived. :)
Turned two, 4mm thick discs, 16mm dia. drilled through 7mm, and mounted on a mandrel in r/ table.......
Application of 4mm endmill........
Drill and tap M3.......
Two new big ends, ready for loctiting........
Tiny, fiddly bits n pieces, that won't stay in me fingers. Or on the bench, once they've escaped..... Grumble......... >:(
David D
lazylathe:
Curiouser and curiouser.... :thinking:
Great update and nice work on those small, fiddly bits!
Maybe a bit of a :thewhip: to get it in line is in order?
Andrew
Stilldrillin:
Thanks Andrew.
A whip may just come in handy. I've tried almost everything else! ::)
Well..... Here we go, again!
I drilled the crankpin holes.......
Luckily the assembly stayed temporarily pressed together, to allow a test run.
Assembled, with a pair of spare Mamod flywheels........
Fitted a new "wonderwick".
Fired up.
And it still wouldn't run. Again! :wallbang:
What's wrong with the thing??? :wallbang: :wallbang:
Everything's been checked/ re done!! Hasn't it?? :shrug:
Took off the hot cap. Sucked...... Hard...... It stuck to me tongue....... Nothing wrong with it!!!
Until, I poked a finger inside........
The wall thickness is around 9thou'. The end cap is 4thou', "tin"...........
I guess it was acting as a one way valve! :wallbang: :wallbang: :wallbang:
Sheesh!!
Sigh........
Nothing else to do, but make another, more robust cap. :(
Couldn't find any 1"od tube in the bits tub.
Mrs Drillin's exercise bike, now has a 2" shorter saddle stem. (From inside the frame tube). Hope nobody tells her...... :paranoia:
Topped to 24mm+. Bored to 23mm.........
Friction turned an end cap........
Couple of thou' under bore size.........
Silver soldered together........
Cleaned up, quite nicely........
I'm starting to worry about me. I don't get upset any more. I just expect things to go wrong........
And they do. Regularly! :wallbang: :wallbang: :wallbang: :wallbang:
Machining a new, thicker flange, tomorrow. Probably! ;)
David D
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