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Author Topic: Prairie Easi-Shunt conversion  (Read 1115 times)

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Offline LAandNQFan

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Prairie Easi-Shunt conversion
« on: December 05, 2016, 10:16:32 am »
As the Dapol GWR Prairie does not have NEM boxes, some surgery is needed to fit Easi-Shunt couplings.
Materials: Easi-Shunt conversion kit, Easi-Shunt couplings and glue (I use Loctite Power Flex Gel Control, which is viscous and sets in c.10 seconds).
Tools: sharp knife and small file.
1) Remove the trucks by sliding the point of the knife under the pivot button which holds the truck to the chassis and twisting gently.  Take care with the rear truck not to damage the pick-up strips either side of the truck as you lift it out.
2) Twist out the Rapido coupling and remove the spring from the truck.
3) Turn the truck upside down with one of the Dapol fillet strips supporting between the wheels so that downward pressure does not pop the wheels out of the truck.
4) Cut the sides of the Rapido box and the nipple for the Rapido spring.  Then file the stubs back flush with the rear face of the box.
5) Glue the thinnest of the Easi-Shunt fillets to the back of a NEM box, wait for it to set and then file any protruding edges flush with the box.
Your before-and-after trucks should look like these.

7) Glue the converted NEM box onto the front of the truck making sure that the top of the box is flush with the top of the axle housing on the truck and that the sides are parallel to the truck.
8 ) When the glue has set, push the pivot pin back into the engine chassis, again taking care not to damage the pickup contact strips at the rear of the engine.
9) Insert the NEM internal pocket and an easi-Shunt coupling - short or medium according to your usual practice.  The picture below shows a short-length coupling.  The original length of the truck with rapido coupling is 22.5mm, and a short Easi-Shunt gives 22mm.  The medium would give a couple of mm more.

10) I found that there was too much play in the front coupling, and the track magnet pulled the coupling dipper down fouling the track.  A piece of micro-strip glued between the inner end of the truck and the chassis prevented that from happening.  The rear coupling fitted more tightly and did not need the micro-strip.


Happy shunting!
« Last Edit: December 06, 2016, 08:58:46 am by LAandNQFan, Reason: Speling erorrs. »
Perhaps the proof that there is intelligent life in outer space is that they haven't contacted us.
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Offline BobB

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Re: Prairie Easi-Shunt conversion
« Reply #1 on: December 05, 2016, 11:01:20 am »
Thank you for the post. What length easi-shunt's did you fit to get the same coupling gap ?

Offline LAandNQFan

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Re: Prairie Easi-Shunt conversion
« Reply #2 on: December 05, 2016, 11:29:40 am »
Thank you for the post. What length easi-shunt's did you fit to get the same coupling gap ?
I've modified point 9) above to try to make this clearer. Thanks, Bob. 
Perhaps the proof that there is intelligent life in outer space is that they haven't contacted us.
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Offline Karhedron

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Re: Prairie Easi-Shunt conversion
« Reply #3 on: December 06, 2016, 09:15:44 am »
Great tutorial, thanks for that.  :thankyousign:

I must get around to converting mine at some point.
Well, that's just not good enough. Some fount of all knowledge you are!  :no:  ;)

Offline MinZaPint

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Re: Prairie Easi-Shunt conversion
« Reply #4 on: September 26, 2017, 05:33:28 pm »
Many thanks for posting that, you've saved me from making a mistake  :thankyousign:
Cogito Sumere potum alterum

 

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