The BSA A7-A10 Forum

Technical => Lucas, Electrical, Ignition => Topic started by: a101960 on 22.05. 2017 10:52

Title: Cleaning dynamo commutator
Post by: a101960 on 22.05. 2017 10:52
I thought that I would do a spot of dynamo maintenance. I remember reading once that lighter fluid is ideal for cleaning the commutator. Before I rush out and buy some is that right? Or should I use something else, and if so what should I use?
Title: Re: Cleaning dynamo commutator
Post by: Greybeard on 22.05. 2017 11:41
I thought that I would do a spot of dynamo maintenance. I remember reading once that lighter fluid is ideal for cleaning the commutator. Before I rush out and buy some is that right? Or should I use something else, and if so what should I use?
Greybeard stands well back..."Ok, kick her over"  >:D
Title: Re: Cleaning dynamo commutator
Post by: muskrat on 22.05. 2017 13:12
G'day John.
I use 100% alcohol (brotherinlaw makes moonshine). If Ive drunk used it all I use electrical contact cleaner https://www.crcindustries.com.au/products/cleaners/co-contact-cleaner
Cheers
Title: Re: Cleaning dynamo commutator
Post by: coater87 on 23.05. 2017 06:18
 Whatever you use, make sure the fumes had time to dissipate  *eek*

 Way back I watched a 250 h.p. DC motor burn off ethyl acitate fumes from someone using it to clean out brush dust instead of an air wond.

 Probably only burned about 15 seconds, but there were 4 sets of dirty knickers watching it happen. Good thing the brush covers were off, or it may have been worse.

 All I can think is solvent pooled up in the bottom of the motor case and didn't have time to evaporate and fume off before it was started.

 Lee

 
Title: Re: Cleaning dynamo commutator
Post by: Black Sheep on 23.05. 2017 06:45
I use a skoosh of electrical contact cleaner and a clean rag. Works a treat. You would almost think it was designed for the job.
Title: Re: Cleaning dynamo commutator
Post by: Triton Thrasher on 23.05. 2017 09:24
Some contact cleaners are just a way of marking up the price of alcohol.
Title: Re: Cleaning dynamo commutator
Post by: a101960 on 23.05. 2017 09:30
Thanks for your replies chaps. Contact cleaner it is then.