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5637 STEAM
LOCOMOTIVE GROUP

 
 

BOILER EXPIRY

 
                 
 


Boiler Certificate Expiry

5637 was due to have a heavy general overhaul (HGO) on the expiry of its 10 year boiler certificate in September 2007, unfortunately this was brought forward by the failure of one of the centre stub axles. The axle in question had begun to slip and fret in the wheel boss it was pressed into, so the locomotive was taken out of service in June and the East Somerset Railway (ESR) workshop team began dismantling the engine.

Work Required

A preliminary survey discovered that by and large the chassis assembly had no serious faults but had a number of defects due to normal wear and tear. Axle boxes, crossheads, brake pins, big ends, eccentrics and motion pins were all worn and required attention. The coal bunker needed to be virtually renewed as did other items with thin plating. The boiler was known to have thinning plates and other defects that the ESR had been monitoring under the supervision of the Boiler Inspector.

The initial estimate was two years to complete the HGO at a cost of around 40,000 for materials.

Chassis

Starting with the chassis, the front buffer beam assembly was replaced with new material. The piston valves were in good order unlike the main piston rings which were replaced. Both cross heads had to be white-metalled and machined and the slide bars assembled and centred to reflect the new size of the cross-heads. All the motion pins and associated bushes were replaced with new items.


Photo: A.Milner
The finished front bufferbeam and dragbox

 

 
                 

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