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Technical

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A4 regulator : top-hat & tear-drop

Preparing Seagull for Doncaster, I followed the Forum advice to clean the regulator motor by firstly removing the superheater .

Curiousity got the better of me and I lifted the spring and regulator top-hat , remembering to note the position of the steam channels.

The top-hat face was cleaned with 8000 micro-grit paper. Noted the tiny profile of the tear-drop steam channel, only 1.5mm in length. I should have taken a photo, as it is hard to believe that such a small device can unleash a such a massive range of speed in the steam mechanism.

Reassembled the regulator gearbox , regulator valve, superheater, cleaned red/green wiper board and

the loco runs fine on the rolling road.

The real test will be pulling a load on the Roadshow layout this weekend.

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Nick Beard
Nick Beard
Feb 09, 2023

Well done !!

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