The restoration of the Kemna (2003)
|The right piston with the slide-bar still attached Somehow we did not manage to loose the piston rod in situ. It took a hydraulic press to get it free.|
|8th of January 2003
The cylinder block. It is in a very good condition. We have a feeling that this engine was mainly used for haulage, as the motion work has quite some wear
|Al there is left after you remove everything
|22nd of January 2003
The cylinder block is removed as well. It is connected to the boiler with 22 cone-shaped bolts. All the bolts have been marked, so we can put them back in exactly the same position.
|The cylinder block seen from the boiler side. The bottom piston valve cylinder can clearly be seen, while further down the 2 cylinders are visible. The steam supply comes from the right.|
|The front tube plate.
Meanwhile we have started to remove the fire tubes. The tube plate is 16mm thick and in good condition.
Our main concern is the status of the boiler. We are making preparations for the first inspection
This image was made looking though the man-hole, while working on some rivets in the smoke box.
|All tubes have been removed. You look inside the smoke box and also visible in the background is the fire box. The four holes on the side of the smoke box are there to hold the super heaters.|
|This image was taken through the man-hole towards the fire
The crown stays can clearly be seen.
There are two support rods to hold the back of the outer fire box. These rods are riveted to the barrel just past the position of the man-hole.
|8th of April 2003
Although there where only 8 retaining bolts, it took 10 hours and the help of a torch to remove the under carriage. The carriage itself is spring loaded and in good shape.
|30th of April 2003
As we all had a day off (Queens birthday !) we took the time to turn de boiler upside down. Good thinking and no hurry was the order of the day.
|She is there !. It was not to difficult to roll the boiler over some wooden planks under the barrel just in front of the outer fire box.|
|The ash pan is mounted with 4 special shaped bolts in the bottom of the fire box and 2 of these where broken. Both have been removed, not without trouble, and new threads have been cut.|
|As the rally season is now fully on, we have not much time
left for the restoration. After the 1st of September we will be in full
This image was made on the 1st of June at Almere, just as we had loaded the Ransomes on the low-loader
We did not do much on the restoration this summer as we visited several
steam fairs with our portable during summertime.
|Having a good time at the GDS !!|
|Our problem with the inner-fire box
During its lifetime a lot of mud and sediments must have gathered underneath the fire door. This caused the plate of the fire box to get overheated. You can clearly see that between the stays the plated is slightly bended. This gave us only one conclusion, the fire box needs to be renewed. A hell of a job, but we see it as a challenge ! Much of the work we will carry out ourselves, but the new fire box will be made in England. It will be a riveted box, just like the original.
Certainly in The Netherlands this is a job not done very often and we will give full details on the next pages.
The rivets in the foundation ring, 54 in total.
The first one on the right is a true rivet, the second a screwed rivet. that ends half way in the foundation ring. This is done because there is simply no room at the inside of the firebox for this rivet..
|A look inside the fire box. The pattern from 6 x 6 rivets in the middle are the stays. In the right upper corner, the fire door can be seen. The opening is supported with 22 rivets.|
|Removing the heads of the stays on the outside. We use a small magnetic drill and a 16mm mill. It removes a sufficient part of the head so it can be removed easily with a hammer and chisel.|
|That is how the rivet heads look after removal. It is a fast way of doing and there is hardly any change of damaging the plate compared to using an angel grinder.|
|The first row of rivets have been removed from the
foundation ring. We first drill a 10mm hole all the way through and then
continue with a 16.5 mm drill. This is stopped about 10mm before the end.
After heating the rivet and fast cooling, it can be knocked out with a
driver. The point is that all the force will be set at the far end of the
rivet. In stead of pushing it out it is pulled out.
All the stays have been cut. You can clearly see the holes in the inner fire box that where cut out with the torch in order to reach the stays
It has to be done this way, as the stays are screwed, so knocking them out is impossible, they have to be cut by means of the torch. Later on we will remove what is left in the outer fire box, to make place for new stays.
|Working with the heavy magnetic drill horizontally. It
weighs about 25 kg and for moving it in position, we need the hydraulic
arm. During drilling the rope is slacked, but kept in position, just in
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