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are my brushes worn? 

 

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 Post subject: are my brushes worn?
Posted: Sun Jan 19, 2014 2:22 am 
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Age: 28

Posts: 2

Joined: 19th Jan 2014

Ride: Falcon EF

Location: Perth
WA, Australia

Hi all ive had a few problems with my 96 EL falcon lpg/petrol... anyway ive come here to get your opinions on the brushes on my alternator. It stopped working a few weeks ago and my batt has been running flat. Im getting 0v from the output terminal of the alternator so iv pulled it out today, it was caked full of grease and black dirt so i degreased all that off. Its a mitsubishi brand alternator btw.

Upon opening it i tested the coils with an insulation resistance tester and they are fine and unbroken.

Ive tested the diodes...all passing current one way only and all have the same resistance.

Slip ring are immac condition, just covered in sludge and grease.

voltage regulator., dont know how to test that

The brushes im unsure about, i havnt opened one before so i dont know how long they are suppose to be... i have a pic in attachments if someone who knows can tell me if they are worn down or thats fine.

If it is fine then i havnt a clue why the alternator doesnt work exept the grease and build up has been stopping the brushes or commutator from working... since there was alot of buildup there.

Thanks in advanced :)

 

 

Attachments:
File comment: brushes taken out and cleaned
brushes.jpg
brushes.jpg [ 157.42 KiB | Viewed 37 times ]
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 Post subject: Re: are my brushes worn?
Posted: Sun Jan 19, 2014 9:34 am 
Getting Side Ways
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Posts: 496

Joined: 14th Sep 2011

Ride: BF II Gas Ute

Location: Canberra
ACT, Australia

Hi,

The brush's should be cheap, so put some in. ( I couldnt see a wear limit in my manual ) The power steering pump can leak oil in which will kill it though. A new alt. wont cost a lot and a 2nd hand should be quite cheap. If it was my car I would replace it then fix the old one and test it as a spare. I havnt had to take mine apart, but normally when they go together you put a wire in a hole at the back to hold back the brush's out of the way for reassembly. Good luck with it.

 

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Regards 96ELGli

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 Post subject: Re: are my brushes worn?
Posted: Sun Jan 19, 2014 10:32 am 
Technical Contributor
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Posts: 473

Joined: 13th Jul 2013

Location: Campbelltown
NSW, Australia

Brushes are worn out - replace them or the complete alternator preferably - check oil leaks from power steering fittings
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 Post subject: Re: are my brushes worn?
Posted: Sun Jan 19, 2014 1:48 pm 
Technical Contributor
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Age: 52

Posts: 5562

Joined: 14th Jan 2005

Gallery: 10 images

Ride: 96 XH/97 EL

Location: South Coast
NSW, Australia

Have a read of auto-electrical-forum-f89/how-to-pull-down-an-alternator-for-an-el-au-and-swap-bits-t111664.html . The brushes are still available from that ebay seller in this thread - brushes might be a bit long at 23.5mm.
You can get OEX ones at 15mm long, part no BRX60311.
The only quick way to test the reg is to put everything together and run on the car.

+1 regards the spare - always a good idea.

 

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96 XH Longreach 'S': LPG, Alarm, 3.23:1 LSD, Cruise, Trip Comp, ABS, Power Windows, Mid Series Dome Lt, Climate Ctrl
97 EL Futura S/W: LPG, Alarm, LED int Lts, Trip Comp, F/Lane Dome Lt, Climate Ctrl, T5 Conversion

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 Post subject: Re: are my brushes worn?
Posted: Sun Jan 19, 2014 2:59 pm 
Fordmods Newbie
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Age: 28

Posts: 2

Joined: 19th Jan 2014

Ride: Falcon EF

Location: Perth
WA, Australia

Will replace brushes asap. Forgot to mention my power steering fluid is leaking from the reservoir ... what kind of damage can that cause?
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 Post subject: Re: are my brushes worn?
Posted: Sat Dec 10, 2016 1:42 am 
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Posts: 5

Joined: 9th Dec 2016

Location: Canberra
ACT, Australia

power steering fluid on brushes will make them disintegrate
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