Overhaul of 5239 "Goliath"

6th March, 2018 by Steve Masters in Workshop Blog

5239 "Goliath" arrived from The Dartmouth Steam Railway and overhaul began in October 2017.  Following is the latest news on the progress in the Workshop.

13th March 2018

This week a lot of progress was made in fitting the horn block bolts. The holes are first reamed until they are parallel and continuous through both the frame and the block. The diameter of the hole is then carefully measured and the new bolts machined 0.002” bigger to give a tight interference fit.

Elsewhere there was lots more primer being applied to the frames and the very wasted front dragbox was cut off behind the bufferbeam.

6th March 2018

The heavy snow this week didn’t hinder our progress too much in the workshop!

The trailing axleboxes do not have replaceable crowns, instead, they have replaceable bronze inserts at just the lower edges. The inserts are fitted into a dovetailed slot and are then pinned. These require renewing, as the axle journals are being skimmed and therefore will be a slightly smaller diameter. The bronze strips are very important and withstand the high piston loads transmitted through to the axle.

With the majority of the shotblasting and priming complete, work has started to refit the horn blocks which were found to be loose. They have all been roughly refitted on the frames.

27th February 2018

The major task of shotblasting the frames is now complete meaning that the frames are now positioned at the back of the workshop where there is a bit more room to work on them. The boiler is now at the front of the workshop ready for work to start on repairing the lap joints and the crown stays.

February 2018

The rocker bearings required replacing so two lengths of cored bronze were slit in half, machined flat, soldered together, machined as one and then melted apart again.

January 2018

Having completely stripped the frames, the job of shot blasting has started. Previously we have always needlegunned the frames which is very slow, noisy and isn’t good for the user due to the vibration. The shot blaster however is very quick, quieter without vibration and the finished results are far better.

December 2017

The final stages of stripping the frames ready for steam cleaning before shot blasting can start. The boiler is stripped of all fittings and a start made on removing the boiler tubes.

November 2017

Having removed the cab, tanks and bunker the week before, the cranes were booked finish the major dismantling. Firstly the boiler was lifted from the frames and the ashpan removed. The boiler was then put onto a wagon. Next the frames were lifted clear of the wheels and put onto the frame trolleys. Finally the wheels were lifted clear of the rails.

October 2017

Having completed 41313 for the Isle of Wight Steam railway in June and then fast tracked 1719 Lady Nan through the workshops to give her a new ten year ticket, we were pleased to welcome GWR 2.8.0T number 5239 Goliath from the Paignton and Dartmouth Steam Railway for an extensive overhaul.

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