Engines > Restoration of Model Engines

Unknown miniature marine engine

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redhouseluv:
Yes, I'm back again!!  ::)

Before I start on a new build I thought I'd take a look at this tiny auction bought fixer-upper. It would be great if someone recognised it and it was no longer categorised 'unknown', but let's see.

It is small, very small, I put a ruler in the picture so you can get a sense of scale. The slide valve is minute, 0.218", and the ports look like they were made with a razor! I have attached a video so you can see all around it and see what's missing and needs looking at

- I don't believe any of the parts above the ruler have anything to do with the engine and were just thrown in the same box.

- I appear to have 2 valve rods of differing lengths and 2 eccentric straps; the one I have temporarily put in valve chest (see pic) is fine, the other makes the slide valve protrude out too far against the port face.

- the valve chest cover appears to have been soldered on at some point; I'd like to remove the solder, what is best for doing that?

I'm not sure if this will be a runner, but I'm going to strip it right back, clean it up and reassemble it and see what happens; I'd love to see it running!  :Love:

Any information, help or advice always appreciated.........

Jasonb:
I'm not sure that you have the chest and valve rod up the right way in the lastpicture. I think the rod should go down to th ecrankshaft and there is a notch in the bed plate that will give clearance for the boss on the valve chest. If you had it going up to the top there would be no way to time the valve events correctly.

The bigger rod and eccentric may have driven a feed pump.

Fine file or rubbing on Emery would take that thin film of solder off.

redhouseluv:
That's what I thought too regarding the orientation of the valve chest .....take a look at the picture below and this is what led to my change in thinking.

There's a small hole in the horizontal arm which sticks out from the eccentric rod. It is threaded so it can be moved up and down, also when I tried it the other way round, the valve gland diameter is too big for the cutout in the brass mounting plate, hence me showing the valve chest in what looks like an inverted position

But that has got me thinking, maybe I've got the whole engine upside down and the crank is at the top?

Apologies.....forgot the video which may help

https://www.youtube.com/shorts/GQrBD0dqGQc

Jasonb:
Ah I can see what that plate on the end of the eccentric rod was for now. Carry on as you were.

I would have said cylinder up, with most hulls being some form of V shape the design lets you get a shallow angle to the propellor shaft

redhouseluv:
I have now dismantled and cleaned the engine as far as I can without damaging anything, its all so small and fragile and I have already sheared a cylinder cover bolt!

- I managed to clean the ports with a few strands of electrical wire poked through.
- I discovered that the longer valve rod is there as the shorter one must have been broken in the past as it is not long enough to bolt to the eccentric rod arm.
- I have carefully filed the valve rod so the slide valve fits without protruding from the valve chest
- Have to make some short columns; as Jason points out if this is a marine engine the flywheel would be positioned very low
- Have to make a small base to mount everything
 

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