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Author Topic: Dapol 14xx running badly  (Read 233 times)

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Offline Nick

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Dapol 14xx running badly
« on: August 11, 2017, 02:21:02 pm »
Hi all,

I'm looking for advice about a very poorly running Dapol 14xx. I've had the loco for years, and chipped it some good time ago. From what I recall, it ran OK afterwards, but I've not used it much.

It's now running very poorly. It will only run at all with some very heavy Back EMF settings, and then with a jerky forward/backward motion accompanied by a slight side to side roll, timed at once per wheel revolution, if I'm not much mistaken. (This tails off with increasing speed but I'm sure is present, just not resonating visibly as much.) It is lubricated.

I was thinking that perhaps my chip installation was rubbing somewhere and was about to open her up to reseat it. But, having dug out the instructions I followed, I've realised that installing the chip didn't expose the mechanism, so I doubt that's it.

Does anyone have any prior experience of this condition? What I should be looking for? And, most of all, how best to open it up/strip it down without the Carpet Monster eating all the little springs, etc.?

Thanks

Nick

The perfect is the enemy of the good - Voltaire

Online Dr Al

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Re: Dapol 14xx running badly
« Reply #1 on: August 11, 2017, 11:22:59 pm »
Look carefully at the quartering on the wheels. It may have shifted - this is very common on these. If the problem is once per rotation, it's highly likely to be wheel related.

Or if it's a very early one the grease could have hardened up in the geartrain - this happens.

Otherwise, the most likely is a failing motor - difficult to diagnose on DCC - if you can run on DC and measure the current that'll help see. But if it's not been used much it's most likely quartering.

Cheers,
Alan
Quote from: Roy L S
If Dr Al is online he may be able to provide a more comprehensive answer.

Offline Nick

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Re: Dapol 14xx running badly
« Reply #2 on: August 12, 2017, 01:36:58 pm »
Thanks, Alan.

It looks to me as though the right hand side front drive wheel is advanced clockwise w.r.t. the right hand rear wheel by a few degrees. The conrod also appears slightly out of parallel with the loco body, whereas, by eye at least, the left hand one is properly parallel to the body.

OK. What do I do about it? Can I fix it, and , if so, how? It feels as though the job would need specialist tools and equipment.
Nick

The perfect is the enemy of the good - Voltaire

Offline robert shrives

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Re: Dapol 14xx running badly
« Reply #3 on: August 12, 2017, 03:00:07 pm »
Hi
The 14xx wheels are known to shift, you may be able to ease back the way its come with a little luck.
It would be best to hold the axle and turn wheel so connecting rod is parallel again to the running plate, the smallest pin heads worth of super glue should fix but beware of wheel being off square to axle - changes back to back -a wobbly wheel. The problem is possible oil has migrated into the axlehole and that has caused some damage to wheel centre and thus loss of grip- the super glue may thus try to the oil - so it might fill the small gap but not help bond.

The problem is if you use the other wheel to grip and turn loose wheel there is a good chance you will loose the friction fit on the sound wheel and you are now in a mess!

Dr Al may have had success but I never have had with it. But then I have only played with two but have to say seen several scrappers eslewhere.
Robert     

 

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