Engines > Restoration of Model Engines

Maiwald Makeover........

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Stilldrillin:
This rebuild is not finished, yet. Though, I started it almost a month ago.

I thought I'd post the first instalments here, until I catch up.

----------------------------

Maiwald Hot Air Engine, rebuild.........



Well, here's the start of another of my rebuilds!  :)

Yet another frail orphan, from my toy cupboard.

This is a James Maiwald hot air engine. It came to me at the end of 2009.




It isn't well! The main bearings are too far apart, and the flimsy crank is flexing.  >:(




This is the best it has ever run.......

http://www.youtube.com/watch?v=1jYypC74hik


My thoughts are to fit an extra pair of bearings, held closer in to the crank throw.

Also, I thought it's flywheel looked better on my Maiwald flame licker. So, it was cannibalised.


Removing the bearings from the steel frames proved a struggle.
The frames are laser cut, and the bearings were just rammed in, much too tight.....










A pair of inriggers. The excess material will be removed later.......




A bit of a shock, finding swarf in the displacer pot! Impacted onto the brass bush. Very poor workmanship..........




This was the state of play, at knock off........




More to come, as and when.   ;D

David D

lazylathe:
Hi David,

I have seen a few of those engines for sale and always wondered about them...
Now i know better! ;)

I managed to acquire a Maiwald about a year ago and it runs very well.
At the moment i do not have any pictures but will be adding it to my engine collection thread soon.
The swarf in the end cap worries me a bit, will have to look into that sometime.

Consider me following along with you!

Andrew

Stilldrillin:
Hi Andrew!

Not too sure where this will go to, or what delights lie in store. But, it's great to have you along with me.....  :))

Lets just say, this engine could/ should be much better engineered than it is........   ::)

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After giving this thing a good coat of looking at, I decided it was much too wide.......

So, I reduced the alloy spacer by 10mm per side, to 48mm.




Extended the thread on the beam pivot shaft. Then screwed on two nuts, and faced to make 48mm spacer rod.




The frame relied on the wooden base, to hold it all square.

Drilled the frames for an extra 48mm spacer shaft, to triangulate and make it self supporting.......




The beam pivot bearing had also seized. Turned an alloy bush, with a slight positioning step........




To hold it central........




The alloy big end/ crank assembly is much too flimsy. But, I'll give it one more chance......

Rebuilt it, using my favourite sleeve lock, at each end of the crankpin.......




Progressing, steadily!   ;)

David D

Dean W:
Hi again, David!  I'm watching along again.  I always keep my eye on you.  'Fraid I might miss something spectacular!  :)

Stilldrillin:

--- Quote from: Dean W on July 23, 2012, 10:45:18 PM ---Hi again, David!  I'm watching along again.  I always keep my eye on you.  'Fraid I might miss something spectacular!  :)

--- End quote ---


Hi Dean.
Really nice to see you're coming along too.   :cheers:

I'm not too sure about spectacular....... But, I do try to provide an interesting climax!  :whoohoo:

------------------

Very slow progress, I'm afraid........

I assembled the crank frame with it's three spacers.
It's now rigid/ self supporting enough, to file the underside flat, to my surface plate.......




Finished the inrigger bearing holders........




Glued into place. Aligned with a length of 4mm silver steel. Positioned outward, by a piece of foam........




Perfectly aligned.........




Rebuilt the crank assembly. Installed a temporary flywheel.

Oiled round...... And fired up..........




And........








It still wouldn't run!   :wallbang:  :wallbang:

Hmmmm..........      :help:

David D

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