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New wheels for Hornby Dublo COBO?





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9 replies to this topic

#1 Sam Moss

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Posted 28 April 2013 - 21:53

Hi all,

 

Recently won a COBO off ebay. Has been detailed with wire hand rails etc and given a decent repaint. Won it for just over 30 notes so I'm open to spend a little on it. The only thing really wrong with it is that the wheel sets on the powered bogie all wobble excessively to the point where it spoils it. I've had a gander at it and my original intention was to swap the wheels an axles from an old HD 20 chassis into the COBO, however this is not possible as the COBO seems to use a slightly larger axle size. Haven't got my vernier handy at the mo so can't measure them but does anyone know off the top of their head what size they are and if any of the main wheel manufacturers do suitable replacements?

 

thanks in advance



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#2 Arthur

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Posted 28 April 2013 - 22:07

Sam, I re-wheeled one many moons ago using Gibson wheels, those for a Western if I recall correctly. I'm pretty sure that the Gibson axles were a direct fit. I'll try and confirm that later this week.

#3 jimwal

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Posted 28 April 2013 - 22:48

Sam,
All Dublo axles are one eighth of an inch diameter so Gibson diesel wheels will fit. 'Warship' wheels are appropriate for the CO-BO as both classes have 3' 3" dia wheels. The model was quite accurate for it's time, though it stood rather too high due in part to oversize wheels.
The wobble may be caused by grooves in the driving wheels that should contain traction tyres but are likely to be missing so allowing the wheels to drop over the rail head. These grooves were much deeper than Lima or Hornby tyred wheels. So, replacement should cure your problem though some traction will be lost.

Regards, Jim

#4 Sam Moss

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Posted 28 April 2013 - 23:04

Sadly it has a full set of decent traction tyres, just got really wobbly wheels. Thanks for the advice so far



#5 Dublodad

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Posted 29 April 2013 - 10:05

Although I should suggest that you join the Hornby Railway Collectors Association to have access to Hornby Dublo spares, there are several suppliers who have general web pages and can supply spares. Try googling Hornby Dublo Spares.

 

I have never been aware of "wobbly" wheel on any H-D diesel loco, maybe the axle is bend!! Beware that there are sprung plungers on the axles to aid current collection.

 

I am surprised that the traction tyres are still OK, They would usually have perished by now. "Real relacements are avalable at a price, but I use suitable sized "O" rings.

 

Good luck

 

Terry



#6 Il Grifone

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Posted 29 April 2013 - 11:45

AFAIK, the wheels of the HD diesels are all the same varying only in whether they are insulated or not and whether they have the groove for traction tyres or not and the axles are 1/8" diameter, so the Bo-Bo wheels should fit. There may be muck in the bearings after all these years.

 

I converted my Bo-Bo to EM many years ago using 14mm Nucro/Jackson coach wheels suitably bushed. The Co-Bo and Deltic don't really need traction tyres. They have quite enough mass to manage without, especially with modern pin-point rolling stock.

 

I have corrected bent axles with carefully applied (brute) force. Turn the axle slowly until the flange is at its closest to the frame. Then insert a small screwdriver between wheel and frame and lever the wheel straight. Several attempts should have it running true.

 

I've recently acquired one too. She was rather scruffy, but cleaned up quite nicely. Unfortunately she is rather sluggish and despite careful tweaking looks like she will need a new magnet.

 

EDIT

The bearing holes could be worn (I've had this in the past - I wore out my (from new) 'Sir Nigel'!). Ream out to 9/64" and fit bushes (Markits for examples) (other sizes and makes are available).

 

Service sheets here http://mtrains.co.uk/3.html (no connection, but can recommend).

 

From these it can be seen that the axles are all the same part no 7715


Edited by Il Grifone, 29 April 2013 - 12:06 .


#7 stewartingram

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Posted 29 April 2013 - 13:51

"despite careful tweaking looks like she will need a new magnet"

 

Never - just a typical HD trait, needs a remag occasionally.

If you need it done, I've got the tool to do it and for RMWebbies only need you to cover postage charges both ways.

 

Stewart


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#8 Sam Moss

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Posted 29 April 2013 - 19:47

Maybe the axle holes are worn as the BOBO wheels just slop around. It could be though that somebody has messed around with it at some point as the insulation material is different to the bobo. Will have to get the calipers out and see whether someones butchered it at some point.



#9 Arthur

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Posted 01 May 2013 - 18:43

I sorted mine out today, I'm sure Jim was right that Warship wheels are the right ones, I knew that they were intended for one of the Westerns hydraulics.  Here it is, the Gibsons fitted straight in with nothing more than some spacing washers between wheel and bogie block.

 

Various May 2013 021.JPG

 

Some photos of my reworked Co Bo, done many years before the Heljan/Hattons one appeared, I think the basic Dublo body captures the look pretty well though really benefits from extra detailing.

 

Various May 2013 025a.jpg

 

Various May 2013 033a.jpg

 

and a comparison with a pristine Heljan version.

 

Various May 2013 034a.jpg

 

Arthur

 

 


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#10 Sam Moss

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Posted 01 May 2013 - 21:07

Ordered new wheels today for my COBO. Have taken it apart and the axles and holes are measuring in at 3,51 - 3,60mm so a tad over 1/8th (3,175mm) Might bush the axles to be honest. Will give a longer lasting outcome. The body may get a repaint. Its had handrails done by the previous owner which whilst ok do stick out in places by about a scale 10"

 

Will post some pics when it comes to fitting the wheels.









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