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Author Topic: Marklin Donkey Engine Restoration  (Read 565 times)

Loosenut51

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Marklin Donkey Engine Restoration
« on: March 21, 2019, 12:54:17 pm »
This rare little chap came in to me in a bit of a state. Heavily modified (for the worse) too many holes for incorrect fitting and covered in cover patches. General quality of soldering poor.

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The only solution was a new boiler
More to follow on this extensive restoration 😉

Loosenut51

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Re: Marklin Donkey Engine Restoration
« Reply #1 on: March 21, 2019, 02:15:50 pm »
Step one strip down and see what's what.

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Loosenut51

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Re: Marklin Donkey Engine Restoration
« Reply #2 on: March 21, 2019, 02:20:00 pm »
Next step see what can be salvaged, give them a clean and good look over.

Chimney ok
Flue pipe ok
Boiler base ok
Copper dome ok
Boiler wall- scrap

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Loosenut51

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Re: Marklin Donkey Engine Restoration
« Reply #3 on: March 21, 2019, 02:25:47 pm »
As you can see the boiler casing is toast ( or Swiss cheese)

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So now to make a new one.

Jim

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Re: Marklin Donkey Engine Restoration
« Reply #4 on: March 21, 2019, 05:28:55 pm »
Love following threads like this.
_______________________________________________
Cheers.
Jim

My YouTube Channel https://www.youtube.com/user/Blue123Heeler/videos


Nick

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Re: Marklin Donkey Engine Restoration
« Reply #5 on: March 21, 2019, 07:10:30 pm »
A favorite engine of mine that I have yet to add to the collection. Keep the pictures coming Karl!  8)
Nick

Loosenut51

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Re: Marklin Donkey Engine Restoration
« Reply #6 on: March 22, 2019, 02:38:00 am »
Now the old copper boiler casing is opened out and flattened to be used as a template.

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Then using new 1.2mm copper sheet the new casing is marked out paying attention to the position of the firebox vent holes and the base fixing locations.


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The holes are drilled to the required size , de-burred and the plate passed twice through my sheet metal rollers to achieve the required diameter.
 
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Kevin68

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Re: Marklin Donkey Engine Restoration
« Reply #7 on: March 22, 2019, 05:59:33 am »
Karl it’s a shame to see an engine in such a state. It’s great to see a fellow member restore this engine to its original condition. Will be watching with interest Karl.
Keep on steaming

Kevin

Loosenut51

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Re: Marklin Donkey Engine Restoration
« Reply #8 on: March 22, 2019, 09:04:13 am »
The only correct fittings on the Marklin was the Safety valve & the steam Regulator. The SV was missing the spring so a new spring was trial fitted plus an o ring and the valve set to the required blow pressure.

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The regulator was given a clean and polish likewise the SV and set aside.

Next was to make and solder in new brass threaded inserts into the dome for the regulator and SV.

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The next part will cover the boiler reassembly.


Nick

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Re: Marklin Donkey Engine Restoration
« Reply #9 on: March 22, 2019, 09:32:29 am »
Some very impressive work so far Karl, and that new boiler is beautiful  8)
Nick

Loosenut51

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Re: Marklin Donkey Engine Restoration
« Reply #10 on: March 22, 2019, 11:41:16 am »
I needed to source a replacement Marklin drain cock (missing when it came in) and a Marklin whistle with a 90deg elbow fitting (also missing).

weeks of trawling Ebay.de came up trumps with these rarities albeit not cheap.

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Loosenut51

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Re: Marklin Donkey Engine Restoration
« Reply #11 on: March 22, 2019, 12:05:10 pm »
Next to clean all parts to bright finish ready for assembly.

A generous application of flux to all parts and then the process of soldering it all together got under way both inside and out, including two more newly made threaded brass inserts for the drain cock and whistle.

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Loosenut51

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Re: Marklin Donkey Engine Restoration
« Reply #12 on: March 22, 2019, 12:08:37 pm »
A quick dip in a solution to neutralise the flux and a cold water rinse & dry and then a polish up on the buffer wheel & test fit all the fittings

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Next we will turn our attention the engine and heavy cast metal base.

Kevin68

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Re: Marklin Donkey Engine Restoration
« Reply #13 on: March 22, 2019, 02:25:26 pm »
Karl splendid work on the boiler and fittings. Looking forward to seeing more.
Keep on steaming

Kevin

Mi Steam

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Re: Marklin Donkey Engine Restoration
« Reply #14 on: March 22, 2019, 02:38:45 pm »
Karl you are doing a great job restoring this Marklin.
Carl "There is a better way for everything. Find it."TAE