Preparing the Shell

The first task was to strip off all factory fitted parts leaving just the basic shell structure. This entailed removing

  •     the 48" fans
  •     the radiator grilles
  •     the air intake grilles
  •     the primer coat of paint

so that I was left with a shell which was as good as 'virginal'

shellb.jpg (10709 bytes)

line1.gif (286 bytes)

And so to work .....

This GP9 has four 36"  fans instead of the two 48",  so to alter the shell to accept them it was first necessary to plug up the 48" holes.  I made two 'plugs' of .060" styrene sheet and sanded them to a snug fit to the holes and fixed them in place with Microscale Micro Weld.  I have found that not all plastic solvents are suitable for affixing styrene to P2K shells but Micro Weld works well.   I had originally used another solvent which has served me well in the past but it did fail later on in the process when I was cutting the holes for the 36" fans.  After re-affixing with Micro Weld the shell withstood the rigours of sawing and paring and sanding.

The scan shows the styrene plugs fitted but the edges not yet filled and sanded smooth

plugs1.jpg (3089 bytes)

bluelin2.gif (1878 bytes)

When I offered the Detail Associates 'chicken wire' style grilles up to the shell I found that there was insufficient overlap to ensure a strong bond.  I think these parts were intended to be used with the original GP18 shutters but I found that the locating pins moulded on the back were not long enough to properly engage the shutter mouldings and that these,  being made of an acetal plastic, would not readily glue to the chicken wire grilles.  I opted to omit the acetal shutters and to fit .020" x .050" strips of styrene around the perimeters of the shutter apertures to provide a suitable edge to which to glue the chicken wire grilles.  A test fit told me that it would not be evident that there are no shutters behind the grilles.

The scan shows the strips of styrene (blue) fitted ready to receive the grilles

grille1.jpg (2833 bytes)

bluelin2.gif (1878 bytes)

I choose to use Detail Associates very fine brass nbw castings for handgrab bolts.  These require a smaller mounting hole than the P2K plastic parts.  I opened out the moulded in holes in the shell,   on top, on the ends, on engineer's side of the long hood, cab sides,  pilots and steps, to .020" with a jeweller's broach,  inserted Evergreen styrene .020" rod leaving it a little proud of the surface, and fixed with solvent.   When dry I went around the shell with the PBL sprue nippers and snipped off the excess leaving a surface that requires just a tiny touch with 600 grit wet and dry paper to complete.

The Evergreen rod is white which provides a handy contrast to the grey plastic of the shell and a good guide as to where the holes need to be drilled for the DA nbw castings.

bluelin2.gif (1878 bytes)

At this stage I filled the flaws in the joins on hood top plugs with Squadron Green putty.  I know this product is not 'flavour of the month' with some modellers due to reported shrinkage and crumbling with age.  I have not experienced this,  possibly due to my using it only for repair of small cracks and flaws.  My technique has been to significantly overfill and allow the putty to harden completely before paring off the excess and finishing off with 600 and 1200 grit wet and dry paper.  I also applied putty to the moulding gate flaws in the tops of the hood and the cab roof and filled the horn mounting hole on top of the short hood because 5623 carries her horn on the cab roof.

The extent of generous filling of flaws with 'Squadron Green' putty . . . . s_green1.jpg (8218 bytes)

. . . . and all that remains after scraping and sanding and cutting holes for 36" fans. . There are distortions in this scan.  The spacing of the fans is the same each end and the holes are smooth and round

s_green2.jpg (6931 bytes)

bluelin2.gif (1878 bytes)

The side sills:

The side sills were modified to full depth by the addition of Evergreen strip styrene .060" thick and then sanded down to match the depth of the short full depth section of the P2K sill.  After this photo was taken the sill slots were drilled and cut and 2.5 mm holes drilled for the water and fuel fillers.

sill1.jpg (4772 bytes)

bluelin2.gif (1878 bytes)


I removed the cast on headlights because I want to use integrated castings of the SP light package.

bluelin2.gif (1878 bytes)

Number Board Access Hatches:

Howard Wise was so kind as to whip out his tape measure and give me exact sizes for these hatches which are 11.25" high by 27.5 inches wide - or 3.28 mm x 8.02 mm in H0 scale.  I am going to cannibalise some Cannon doors to make the hatch doors.  I have been unwilling to physically mark the shell in preparation for cutting out the hatch apertures - I have had misadventures with scribers in the past!

So I have opted to mark out my aperture placement with masking tape.  This has enabled me to play around with the positions until I have them where I want them;  gives me clear lines to which to cut;  and protects the immediately surrounding area in the process....

... and the end result.   Clean apertures and no scarring of the surrounding shell.  Phew!

The cast on class lights have been pared off and drilled to accept MV lenses.


hatch1.jpg (22616 bytes) hatch2.jpg (24758 bytes)

Final touches to prepare the shell:

I decided not to use the supplied acetal sun shades due my inability to get the mouldings to fit seamlessly in the slots in the roof.  I filled the slots with styrene strip and smoothed off the roofline.  Whilst at it I filled the holes in the roof top where the door hinge pins are exposed.

roof1.jpg (1781 bytes)

What about the louvres?

There are some minor inaccuracies in the louvre configuration due to my using a GP18 shell for a GP9.   On the side of the tool box (or battery box?) below the short hood there are two groups of three short louvres.  For 5623 these should be two groups of six short louvres.  On the fireman's side of the short hood there should be two groups of (four?) short louvres.   After weighing up how I might add these louvres,  including casting some in resin and gluing them to the shell I have decided to leave well alone rather than risk damaging the shell.


Return to main page