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All Steamed Up - repairing Bachmann coach glazing

Silver Sidelines

Entry posted by Silver Sidelines

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The sun has come out and the garden beckons. With the sunshine we can also see which of our double glazed units have failed. Upstairs the sudden warmth is likely to be responsible for the spontaneous failure of the glazing in one of my Bachmann Mark One coaches:

 

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This need not be a major problem. Many of us will be familiar with the 'stress test' applied to items sent by post and will have received coaches with displaced glazing. I must have been inside over half a dozen Bachmann coaches, the first being a Restaurant Car Unclassified where some of the tables had been glued at a jaunty angle and were shouting out to be repositioned.

 

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First you need a soft cloth to protect the roof of the coach.

 

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With the coach on its roof the two screws holding the bogies are removed.

 

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After lifting off the two bogies the Bachmann coupling compensation units can be lifted out, coupling end first. This way the retaining spring at the opposite end can be gently eased off its plastic spigot using a fine screw driver. The secret is to not stretch the spring. This way you are in control and the spring should stay attached to the plastic compensation device.

 

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Finally the three screws in the underframe are removed. These release the underframe from the seating unit allowing the coach body to be dismantled. However before proceeding to the final stage it is necessary to disconnect the water tank filler wires at the coach ends:

 

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This is where you need to be on good terms with your wife and why you may need to undertake time in the garden. You need a pair of eyebrow tweezers to gently pull out the filler wires from the coach ends. I wrapped the metal ends of the tweezers with masking tape to 'soften' the tweezers and prevent damaging metal to metal contact, and hence preserve the blackened finish on the filler wires.

 

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With the wires disconnected the coach underframe can be removed from the rest of the body.

 

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You might be lucky sliding the seat unit out and only removing the filler wires at one end of the coach. You will need to look out for the internal metal weight which may not be glued and which has the potential to damage the external paint finish of the model, so be careful and put the weight to one side.

 

If possible the filler wires should be removed at both ends allowing the coach to be completely dismantled

 

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This way the failed glazing can be easily repositioned. At the same time it is sensible to check the rest of the glazing and to see which other units need reattaching.

 

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I don't know what adhesive Bachmann use but I have successfully repaired a number coaches using Butanone. In the past I had access to Methyl Ethyl Ketone (MEK) but this supply has dried up (literally). I am not a chemist but I suspect from the literature that Butanone is just another name for MEK.

 

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I apply the Butanone sparingly with a fine paint brush around the edge of the glazing unit while at the same time making sure that the glazing is pressed firmly into its final position. With the coach dismantled it is an easy matter to see how far the Butanone penetrates the joint. Too much Butanone and you will get coloured liquid plastic oozing out round the front of the glazing - so be sparing.

 

When the glue has hardened, which can take around 30 minutes, the coach can be reassembled which is the reverse of disassembly. With this particular coach it might have been sensible at this stage to glue the metal weight to the inside of the underframe as done on most Bachmann coaches. However I chose not to glue the weight and underframe together and final reassembly required the coach to be held correct way round with the screws pushed in from underneath - not clever.

 

Sometimes there can be difficulties reattaching the filler wires and on occasions the existing holes in the coach ends can benefit from opening out with a 0.5mm twist drill rotated by hand in the existing hole.

 

With the body reassembled and wires reattached it only remains to reattach the coupling assemblies and the bogies. It is important to check that the coupling assembly is properly seated and is lying flat with the two prongs resting up against their respective stops. Past experience shows that where this has not been carried out correctly the compensation unit will not function and the coach will unexpectedly derail on curved track - so be warned. If all goes well the labour time for the job should be less than 30 minutes and the coach should be back good as new:

 

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rcmacchipilot

Nice how to article :D, butanone is similar to MEK but not quite. The difference lies in MEK being a ketone, where as Butanol is an alcohol. Because they are so chemically similar they do the same job in anycase so it doesnt matter. :D

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Silver Sidelines

Nice how to article :D, butanone is similar to MEK but not quite. The difference lies in MEK being a ketone, where as Butanol is an alcohol. Because they are so chemically similar they do the same job in anycase so it doesnt matter. :D

 

Many thanks, ah yes 'A' level chemistry, there was something about Aldehydes, Ketones and Alcohols.

 

Regards Ray

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buffalo

My A level chemistry was also a very long time ago. However, your photo of the Carr's bottle hides the end of the name. If you look at the bottle it says "butanone", not "butanol". Also on the bottle is the EINECS (European Inventory of Existing Commercial Substances) number 201-159-0. Putting this into google leads, amongst others, to a useful site for finding out about what these numbers mean. The formula is C4H8O* which doesn't look like an alcohol to me. Methyl Ethyl Ketone is listed under the synonyms for Butanone.

 

There may be differences between the products supplied under these names by different suppliers but, fundamentally, they are the same chemical.

 

Nick

 

* this editor doesn't allow subscripts...

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Silver Sidelines

My A level chemistry was also a very long time ago. However, your photo of the Carr's bottle hides the end of the name. If you look at the bottle it says "butanone", not "butanol". Also on the bottle is the EINECS (European Inventory of Existing Commercial Substances) number 201-159-0. Putting this into google leads, amongst others, to a useful site for finding out about what these numbers mean. The formula is C4H8O* which doesn't look like an alcohol to me. Methyl Ethyl Ketone is listed under the synonyms for Butanone.There may be differences between the products supplied under these names by different suppliers but, fundamentally, they are the same chemical.Nick* this editor doesn't allow subscripts...

 

Nick, thank you for your efforts. Yes in my haste I have made a mistake and I have amended my Blog accordingly. I had it in the back of my mind that the two products were the same.

 

Regards

 

Ray

 

PS ...and all this after an A Grade for A Level Chemistry

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gazmanjack

I don't know if anyone has tried Testors Model Master, Clear Parts Cement & Window Maker, item no. 8876C. I have found this to be excellent in the past as it doesn't leave any 'possible ' frosting or crazing on the glazing. This product can also be used for replacing the glazing in window recepticles, if used carefully.

 

Cheers, Gary.

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Grizz

Thanks so much for posting this great 'how to do it'! I have had to do this a couple of times and have just bought another MK1 with 'glazing loose inside the body'. I couldn't remember all the details of how I did the previous ones, you make it easy to understand and simple to follow. Many thanks

 

ATB Grizz

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ironman1

Received a 2nd hand coach in the post earlier today with three of the glazing panels loose inside. After much (well...a little) cussing I then searched for some help on Google and found your post. I followed your instructions and advice and am glad to report that I successfully managed to remedy the problem and now have a good coach to add to my collection... also seated a few passengers on board whilst the opportunity was there.

 

Took a bit longer than 30mins, mind... but dare say I'll get a bit more proficient at it next time I need to disassemble a Bachmann mk1 coach.

 

Many thanks for taking the trouble to show us how it's done...much appreciated.

 

Regards,

Ian    

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Silver Sidelines
On 06/01/2020 at 17:10, ironman1 said:

Many thanks for taking the trouble to show us how it's done...much appreciated.

 

 

Thanks Ian - a good start to the New Year.

 

Cheers Ray

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