Hexhead Alternator rewind

[Khanage]

I have a failed Denso Alternator (48,000 miles GSA 2012) does anyone know if this can be repaired/rewound. Or should I cough up the £760 notes BMW Motorrad are offering to relieve me off? No reasonable priced second ones available. James Sherlock want £600!! ouch

 

[dub 24]

My alternator packed up last year. I was able to get it fixed locally for about 80 Euros, if the case isn't cracked it should be able to be repaired by any decent auto electrical repairs

 

[Steptoe]

In 99% of cases the alternator case usually cracks and becomes deformed making the unit scrap. I’ve more than a dozen piled up ready to take down the local scrap yard for £50/£70 pocket money

 

[dicktheleg]

In 99% of cases the alternator case usually cracks and becomes deformed making the unit scrap. I’ve more than a dozen piled up ready to take down the local scrap yard for £50/£70 pocket money

Don't forget to tell HMRC...

 

[Miserable Git]

My local electrical shop couldn’t mend my none corroded alternator as the reckoned they couldn’t get parts for them. I bit the bullet and bought a new one from Cotswold BMW with Ukgser discount at £630 delivered.

 

[JohnnyBoxer]

My local electrical shop couldn’t mend my none corroded alternator as the reckoned they couldn’t get parts for them.

I bit the bullet and bought a new one from Cotswold BMW with Ukgser discount at £630 delivered.

 

[crumbles]

Would it be prudent too remove my 2012 Alternator too get it refurbished before it gives up...?.

 

[Steptoe]

This is why in 99% of cases 1200 alternators can’t be reconditioned. They don’t have the usual alternator electrical problems needing a simple rewind or stator. It’s more terminal. I’ve many more

 

[johnnyboy]

I think removing the fuel tank and treating the casing with acf50 or the likes would be worth it. I covered my replacement alternator with acf50 grease when I fitted it.

 

[crumbles]

That's something on the lines I was thinking,
Or I thought...perhaps too stip it down and lube the bearings...
Would not want it too give up abroad...

 

[johnnyboy]

I don't think the bearings are the issue. Read Steptoe's post above, re the casing corrosion...

 

[Slipperyeel]

I think removing the fuel tank and treating the casing with acf50 or the likes would be worth it. I covered my replacement alternator with acf50 grease when I fitted it.

Exactly what I was thinking!

Though when I soak mine in it late autumn, I use there paraffin sprayer with the long nozzle so I reckon my alternator is getting coating without taking the tank off.

Sent from my SM-S908B using Tapatalk

 

[Mistacat]

Totally agree, I have a small cheap touch up spray gun dedicated to ACF50.
140psi produces a very fine mist even in cold weather, my alternators have always had a good covering it also gets inside so no trace of corrosion.
Current 2012 GS used all year round and done 94K miles.

 

[Rastaossie]

Any part no on em? anything else use the same one? looks fairly generic. 600 quid is ridiculous.

 

[albatross]

How about here…
no idea if they would fit….

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[dashfixer]

My alternator went a few years ago. As Steptoe said the case was cracked. When I looked further I found that the stators had really corroded badly and the expansion cause by that had cracked open the case. For a few days before it seized the drive belt was slipping for a few seconds after start. So if you hear the squealing from that area be prepared for alternator death. BTW I got hold of a second hand one from Utah via ebay £150. It was like new.

 

[Pukmeister]

My alternator went a few years ago. As Steptoe said the case was cracked. When I looked further I found that the stators had really corroded badly and the expansion cause by that had cracked open the case. For a few days before it seized the drive belt was slipping for a few seconds after start. So if you hear the squealing from that area be prepared for alternator death. BTW I got hold of a second hand one from Utah via ebay £150. It was like new.

An almost identical story for me, I got lucky with a used Denso on eBay from a breakers in Arizona for £65, being a dry state it was like brand new.

Bit of a sod removing the front ESA shock absorber to remove the alternator, maybe Steptoe knows an easier way ??

I managed to free up the old seized rotor/stator afterwards and the only bit of casing that cracked was a section underneath between the mounting feet so it was still a useable unit.

You might get lucky with yours if you manage to free up the moving parts and douse it all in ACF50 ?

I would recommend any owner of a Hexhead give their alternator a thorough spray of ACF50 or similar every autumn to keep it working.

 

[Neil W]

Surely with the thousands of variations of 12volt alternators out there it must be possible to fairly simply engineer a conversion bracket to adapt a more readily available unit to fit the hexheads to overcome this issue

 

[dashfixer]

An almost identical story for me, I got lucky with a used Denso on eBay from a breakers in Arizona for £65, being a dry state it was like brand new.

Bit of a sod removing the front ESA shock absorber to remove the alternator, maybe Steptoe knows an easier way ??

I managed to free up the old seized rotor/stator afterwards and the only bit of casing that cracked was a section underneath between the mounting feet so it was still a useable unit.

You might get lucky with yours if you manage to free up the moving parts and douse it all in ACF50 ?

I would recommend any owner of a Hexhead give their alternator a thorough spray of ACF50 or similar every autumn to keep it working.

I think we are members of a very large group suffering genny death. I didn't remove the front shock to change mine. I did take the tank and the ECU mounts off though.

 

[dashfixer]

Surely with the thousands of variations of 12volt alternators out there it must be possible to fairly simply engineer a conversion bracket to adapt a more readily available unit to fit the hexheads to overcome this issue

I've often thought that and if I'm ever in the need to change another one I think I will look into that idea. As far as I can see there's nothing special about them so we could probably source an appropriate car alternator.