The Sir Nigel Gresley Locomotive Trust LtdSubscribe to 60007

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OVERHAUL 2015 - 2018

All the overhaul photos may be found here.

Sir Nigel Gresley is now out of traffic for overhaul. This will probably take three years and cost about £750,000. If you would like to make a donation towards this overhaul please click on one of the the donate buttons.

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Notes from information supplied by Darrin Crone, Locomotive Engineer.

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From January 2017.

15 January 2017

Battle recommenced on the removal of the middle cylinder cover studs. Though slow, we are making progress with, by the end of the week, one full stud left, however there are a small number that have broken and will require drilling out. Of course the broken ones are the most inaccessible ones. The Engineering Team is now working on the design of a jig to ensure accurate drilling of the broken studs, as we cannot risk any damage to the cylinder casting by wayward drilling.

We haven't worked on the bogie for some time as the Engineering Team has been fully occupied on the the loco frames. In the meantime the bogie had been moved to allow Rocket's boiler to be placed where it could be dismantled for overhaul. Where the bogie was moved to was unsuitable for further work. However, with the removal of some of the racking from the workshop we identified an area where we could put the bogie and work on it. With the agreement of the NRM Workshop Manager, a trio of Engineering Team Leaders skillfully moved the bogie frames to where we have plenty of room to recommence work.

Painting has continued this week with primer being applied to the main frame plates for the first time this overhaul. In front of the painters other team members have been attending to any prep work prior to painting. With the removal of the buffers this has required descaling and cleaning around the buffer housings and the bufferbeam itself.

The front buffers carry some damage from an historical heavy shunt. They are fully serviceable but can't be fully dismantled for cleaning and inspection. So this week the repair of the buffers and careful dismantling began. Whilst at the bufferbeam the removal of the left hand buffer has allowed the replacement of a loose rivet identified during the frame survey. This was replaced by the Riveting Team on Friday. At the same time a rivet was replaced on the bufferbeam to mainframe bracket behind the same buffer.

At the dragbox, reaming was completed this week. Well done to everybody who has taken a turn on this job. A magnificent result has been obtained all by hand, in an inaccessible location. We also used the magnetic clamp drill for reaming this week to clean up some holes that were very close to available machine reamers that the NRM loaned us. The fitted bolts for the reversing shaft vacuum clutch were roughed out on Saturday but require final machining and fitting.

Next to the frames, cleaning of the air pump and preparing it for overhaul continued with the strainers and cladding being removed and cleaned.

The inspection and assessment of the hornstays continued this week with the centre/driving hornstays. Both were dye-penetrant inspected and were found to be flaw free and were then refitted to the engine. Further inspection work this week was carried out in the steam chests where the valve liners have been removed. This critical area requires careful assessment as the new liners have to be a good fit. After assessment it will be decided if any reconditioning of the casting is required.

The front left hand buffer was removed last week by the "007 Gang". At the upper corner of where the buffer was can be seen the removed rivet which was replaced this week. 7 January 2017
Photograph: Richard Swales.

LH buffer removed

The painting of the outside of the main frame plates was started this week. Will Morgan makes a start with final wipe over before applying the primer on 11 January 2017.
Photograph: Peter Brackstone.

Painting main frame plates

Gloss has been applied to frame stretchers. A view looking forward from where the firebox is normally located. 11 January 2017
Photograph: Peter Brackstone.

Gloss applied to frame stretchers

Primer on the outside of the left hand frames. 11 January 2017
Photograph: Peter Brackstone.

Primer on outside LH frames

A view of the right hand frames now primed from in front of the Cartazzi to the cylinder casting. 11 January 2017
Photograph: Peter Brackstone.

RH frames now primed

8 January 2017

The dragbox reaming continued this week. This has turned in to a time consuming job as there are a number to do and they are deep holes. I must thank the patience of those taking their turn with this job. On Thursday I examined the results so far and I think the end is in sight.

Painting continued this week with primer now being put on to the forward sections of the inner and outer Cartazzi frames. Elsewhere the Painting Team has applied further coats to the large "+" stretcher and continued on the footplating. The footplating has also seen the attention of the welder. As previously reported the footplating has cracked in service and is being welded up. The right hand side is now complete and some prep work has been done to the left side.

The footplating has also seen the replacement of the loose rivets around the brackets where the splashers are secured. The loose rivets were identified during the frame survey and were then removed. On Friday the Riveting Team replaced the rivets on the long angles that fasten the outside of the leading splashers to the footplating. The frame/splasher brackets were also re-riveted, where we could access them. There are a number that are inaccessible with the set up we have but we have a plan.

The valve liners were removed before Christmas and the steam chests now need cleaning out and preparing so that we can take measurements in preparation for ordering the replacements. The right hand steam chest has now been cleaned out. Later in the week cleaning of the air pump continued, one of the most difficult items to get clean due to its complicated shape.

The Engineering Team is now removing the hornstays to assess their fit and to examine them for damage and cracks. The trailing set were removed and after cleaning were "di-penned". After detailed examination they were declared free from defects. They were then refitted. Their fit is good so they should not require any work, though it has been decided to fit new securing bolts at this overhaul.

On Saturday we had a productive "007 Gang" (Junior Volunteers) working day. Both buffers were removed and dismantled. A start was made on cleaning the components and the buffer housings on the loco.

The trailing right coupled wheel hornstay. It has been thoroughly cleaned and sprayed with dye penetrant fluids to show up any surface defects. 5 January 2017
Photograph: Darrin Crone.

Trailing coupled wheel hornstay

Not mentioned in the report but testing and examination of the mainframe plates continues. This is the right hand side to the rear of the cylinders. 5 January 2017
Photograph: Darrin Crone.

Mainframe plates test & exam

The trailing left coupled wheel hornstay is examined by Phil Slater on 5 January 2017.
Photograph: Darrin Crone.

Trailing coupled wheel hornstay

The hot rivet is passed through the hole in the frame and is held up, then hammered down into the frame countersink by Mick Robinson. 6 January 2017
Photograph: Trevor Camp/SNGLT.

Hot riveting

The rivets are heated in a mobile hearth near where the riveting is taking place. As we are only replacing rivets in odd locations, spot riveting, they are heated individually. 6 January 2017
Photograph: Trevor Camp/SNGLT.

Mobile hearth

Rod Thomas resumed cleaning of the air pump this week. 6 January 2017
Photograph: Trevor Camp/SNGLT.

Cleaning the air pump

A member of the "007 Gang", our Junior Volunteers, with the components that make up the buffers that they had just removed. 7 January 2017
Photograph: Darrin Crone.

Buffer components

A view where the right leading coupled wheel is normally located showing new rivets in the frame and in the long angle under the footplating. 7 January 2017
Photograph: Darrin Crone.

New rivets in the frame
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From July to September 2016.
From October to December 2016.

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