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Marklin Donkey Engine
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Roly Williams


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Location: Lambourn, Berks.

PostPosted: Sat May 06, 2017 8:41 pm    Post subject: Marklin Donkey Engine Reply with quote

I've made a start on restoring this engine (previously under discussion here: http://modelsteam.myfreeforum.org/ftopic95502-0-asc-45.php).

My first priority is to get it into working order. I can then decide what I will do cosmetically (if anything).

This is what it looked like on receipt (the wood is my desk, not a nice wooden base!):



On cleaning some of the gunge off, it became obvious why the steam pipes had been unsoldered. The screws holding the boiler to the base are missing and the boiler just lifts off:



Also obvious when the gunge had been removed was that the flue was not steam tight where it leaves the boiler top:



This is what I was hoping was NOT going to happen when I tried to straighten the crank pin:



Fortunately, it had just been soldered in place and it was just the solder that gave way. I can resolder it but I think a more proper repair is justified.

I needed to remove the top of the boiler in order to beat out the major dents and to redo the soldering. I was a bit worried about how I was going to grip the boiler during this process because it's rather thin and fragile. I eventually devised this method:



After annealing it, I hammered out the biggest of the dents:



I will have to get somebody to make me a couple of bushes; one for the safety valve and one for the steam pipe. Unfortunately, after beating out the dents, the holes are no longer round! I will have to ream them out to a larger diameter before specifying the bush sizes.
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Killian Keane


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PostPosted: Sat May 06, 2017 8:51 pm    Post subject: Reply with quote

Total stripdown and rebuild,  thats the way to do it
, Great work so far  
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andycrazy


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PostPosted: Sun May 07, 2017 4:03 am    Post subject: Reply with quote

You are doing a thorough job Roly.
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kevin1


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PostPosted: Sun May 07, 2017 5:04 am    Post subject: Marklin Donkey Engine Reply with quote

Roly will watch this with interest great job on the strip down and the start of the restore.
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Roly Williams


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PostPosted: Sun May 07, 2017 10:03 am    Post subject: Reply with quote

I've reamed out the holes in the boiler top. I had to ream them out to much larger diameters than they were originally but that doesn't really matter because I'll have to have bushes made anyway. At least they're round!



Does anybody know what thread the original safety valve would have been? If I'm going to get a bush made (and maybe a new safety valve also), it might as well be ready for the off chance of me finding an original valve at some time in the future.
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Celsius 100


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PostPosted: Sun May 07, 2017 10:15 am    Post subject: Reply with quote

The poor old donkey has had a dreadful life and I wish you well with the restoration..
I do not have a means of measuring thread sizes. However, my Wilesco D455 safety valve fits my Marklin Donkey perfectly.
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Roly Williams


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PostPosted: Sun May 07, 2017 10:30 am    Post subject: Reply with quote

Celsius 100 wrote:
The poor old donkey has had a dreadful life and I wish you well with the restoration..
I do not have a means of measuring thread sizes. However, my Wilesco D455 safety valve fits my Marklin Donkey perfectly.


Ah, that's good. That means it's a standard M6. That makes life a lot easier!
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MuniSteam


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PostPosted: Sun May 07, 2017 1:32 pm    Post subject: Reply with quote

Nifty looking engine! Looking forward to seeing how it looks and runs once restored  
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James


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PostPosted: Sun May 07, 2017 2:31 pm    Post subject: Reply with quote

I will be following this with interest, Roly. You are doing a cracking job thus far and I am sure you are the man to return it to it's former glory. I look forward to seeing the finished article (both on here and no doubt on your STL table this year!)
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MrMamod


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PostPosted: Sun May 07, 2017 5:01 pm    Post subject: Reply with quote

Great job so far Roly    Did you find any makers marks on your strip down of the boiler ect  
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Roly Williams


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PostPosted: Sun May 07, 2017 6:50 pm    Post subject: Reply with quote

MrMamod wrote:
Great job so far Roly    Did you find any makers marks on your strip down of the boiler ect  

No maker's marks atall
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MrMamod


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PostPosted: Sun May 07, 2017 7:04 pm    Post subject: Reply with quote

Thanks Roly and just wondered why they or someone had put the curved chapter ring type piece on the boiler    
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Killian Keane


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PostPosted: Sun May 07, 2017 7:08 pm    Post subject: Reply with quote

MrMamod wrote:
Thanks Roly and just wondered why they or someone had put the curved chapter ring type piece on the boiler    

I beleive that would normally have had forward and reverse written on it, thus the positioning behind the reversing valve  
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Roly Williams


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PostPosted: Sun May 07, 2017 7:21 pm    Post subject: Reply with quote

Killian Keane wrote:
MrMamod wrote:
Thanks Roly and just wondered why they or someone had put the curved chapter ring type piece on the boiler    

I beleive that would normally have had forward and reverse written on it, thus the positioning behind the reversing valve  

AHA! Yes, that makes sense. It would explain the word "BACK" visible in this image: http://gallery.myff.org/gallery/2063125/WP_20170429_23_29_48_Pro.jpg
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andycrazy


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PostPosted: Sun May 07, 2017 9:15 pm    Post subject: Reply with quote

You have done a good job there Roly.  This is going to be a great resto.
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