Hornby always used to set their buffers too high - something to do with their
The correct height for 00 scale would be 14mm at the buffer centre height.
I don't have a J83 but I think it's much like the "Jinty" of earlier years.
On that, you would have to file away around 2mm of frame metal front and rear,
while watching that sufficient clearance remained over the motor. This would
have to be done precisely or the body would lean.
The rear is retained by two cast pegs and the front by a screw. Those fixings
would be messy.
Probably it would be best to remove everything from the chassis before filing.
The Hornby J-83 in my collection is a fairly recent R.316 model. The buffer
centre height measures to be 15.5mm, or 1.5mm too high to the standard cited
by Gregory Procter. Part of this is the driver diameter - Hornby uses a
standard chassis shared with other locomotives (including a Diesel shunter)
with 19mm drivers. The prototype had 4' 6" drivers which should be 18mm on
the model. I don't know about the availability of more correct drivers.
The buffer centres appear to be correctly placed relative to the footplate,
so the rest of the problem seems to be that the locomotive body rides too
high on the chassis. It would be difficult to lower the body straight down
because there is very little clearance between the top of the lead driver
and the inside of the body and underside of the footplate at the rear of the
front splashers. However, comparing the model to photographs of the J-83,
it appears the Hornby body sits too far forward on the chassis - the lead
driver does not line up to the center of the curve of the front splasher,
and the crankpin of the rear driver when all the way back is hidden behind
the cab footsteps, rather than being clearly visible ahead of the footsteps.
Moving the body about 1 to 2mm to the rear would correct these issues, and
allow the body to the dropped 1 mm on the chassis.
This appears to be doable, but a little complicated. My model uses a
snap-in arrangement to attach the body to the chassis, which would have to
be abandoned. Moving the body to the rear would allow the rear buffer beam
to drop down over the end of the chassis. The front of the chassis above
the front coupling would need to be notched to allow the front buffer beam
to move to the rear and down. A new attachment system would then need to be
fabricated. One approach would be to add plastic blocks to the body above
the existing coupling mounting screws, and use longer replacement screws to
both attach the couplings and hold the body to the chassis.
Hope this helps. I'm a Yank, so I hope that my nomenclature, if not
correct, is at least clear to you. Gary Q.
The Hornby J83 is one of the older models from Hornby that has not yet been
'revisited by the Chinese! It was always 3 to 4mm too tall and is not easy
to sort out! If you are really intent on lowering the buffer height, the
easiest way is to put a deeper buffer beam on with the buffers at the
correct height. I know this will make the engine appear incorrect when
viewed from either front or rear, but it is the only way that I have found.
Over the years I have tried lowering the body on the chassis without
success. This is due to the way in which the body fits onto the chassis.
There have been no details about whether or not Hornby intend to revive and
improve the model.
Over to you!
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com ).
Polytechforum.com is a website by engineers for engineers. It is not affiliated with any of manufacturers or vendors discussed here.
All logos and trade names are the property of their respective owners.