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The Restoration
Other CX19s

Bulletin 8 - 13th November 2005

We have been looking at the radiator over the last two weeks.

Perhaps a history lesson is relevant first. During its production run, there were several changes made to the radiators fitted to the Model CX19. All pre-war chassis and the earliest post-war chassis had a top tank with the Albion scroll and the Sure as the Sunrise motif on a rectangular badge which was screwed on. This is the type shown on the home page. This gave way to a new design which had the Albion scroll cast into the top tank with rays spreading from it. At the same time the screw on filler cap was discarded in favour of a quick release sprung hinged cap. As well as being thoroughly practical for bus operation allowing easy filling of the radiator, this chromed cap was also an attractive design. This is the type of radiator which was fitted to 1877 when we acquired it. The final and the most common pattern of CX19 radiator was basically similar to the type on 1877, but with a larger Albion motif without the sunrays spreading from it. So we've got the intermediate type - the Albion scroll cast into the top tank with rays spreading from it. The problem is that operators swapped radiators around after overhaul or accidents and, sixty years later, it has become very difficult to ascertain with any degree of certainty exactly when one pattern of radiator gave way to another. So we think we have the correct type of radiator, but we can't be absolutely sure - 1877 may have been delivered with the earlier type.

Now it appeared that there was a weakness in the CX bus radiator in that the bottom aluminium casting was prone to cracking. In Sydney this problem was solved by replacing the aluminium casting with a section of steel angle iron. In Scotland, Western SMT did the same thing but Glasgow Corporation had a different solution. The radiator was brought forward and the two lower fixings were mounted on a new frame behind the radiator, instead of directly on to the chassis. This frame was centrally pivoted on the front cross member which supports the front engine mount. This central pivot required a cut out in the radiator grille, effectively a downward extension of the starting handle aperture. This Glasgow mod resulted in a longer bonnet and side panel. The Cheltenham and Welsh operators and those who ran single deck equivalents appeared to get away without any alterations - maybe they had an easier life? When the angle iron conversion was carried out in Sydney it appears that the vertical slatted grille was replaced with a wire mesh grille. All the DGT fleet was converted in this way and if any post-war CX19s were delivered with the rectangular badge type radiator when new, they were all eliminated presumably at first or subsequent overhauls. Here endeth the lesson on CX bus radiators!

It is our intention to overhaul 1877's radiator and return it to the way it looked when it entered service in 1947 - i.e. retaining the current top tank with vertical slatted grille and cast aluminium bottom. We've been lucky to acquire a very early CX bus radiator from which we can salvage the bottom casting and vertical slatted grille. So we've started work on making one good radiator out of the two.

On the left is the radiator which has come off 1877 showing the Sydney
modification to the bottom casting and the mesh grille, while on the right
is an early pre-war radiator which has come off a Glasgow Corporation
CX25 or CX19. You can tell it is a Glasgow radiator by the inverted U-shaped
extension of the starting handle aperture.

John starts to dismantle the two radiators.

The bottom casting is taken off the pre-war radiator.

Davie and John strip down 1877's rad. While removing the old Sydney angle
iron modification from the bottom of the radiator the steel bolts have sheared
in the cast aluminium side plates. Therefore the two side plates have to be
removed so they can be taken off site to have the bolts drilled out.
The tubes will need new rubbers top and bottom.

The vertical slatted grille from the pre-war radiator is in reasonable condition
but will require to be sent away for repairs before refitting to 1877's radiator.
Closer inspection of the grille has revealed that it had been chromed when new.
None of us had ever seen a chromed grille on a CX lorry or bus so the conclusion
must be that it was originally prepared for display purposes or fitted to a motor
show bus.