Lucas dynamo identity

[189Participant]

Can anyone confirm the Lucas 12 volt dynamo model fitted to the Light 15? I need to replace the Lucas C39 fitted to my 52 Light 15 but, because the mounting bracket is such a lash up, I suspect C39 may not have been the original type.

David 189

[David FaulknerParticipant]

Looking at the Lucas cross reference chart: http://www.classicvehicledata.com/wp-content/uploads/2013/01/lucasgenerator46to60.pdf 

C39PV-2 seems to be the number for a ‘late’ car but someone else should be able to confirm for you.

[AlistairParticipant]

Look here…both the 1949 and 1950 use the C45….but may have changed…by 1952!

https://traction-owners.co.uk/wp-content/uploads/2017/01/Lucas_1949.pdf

Alistair

[189Participant]

Thank you gentlemen. Now I’m off to track down a suitable C39 replacement.

David 189

[1156Participant]

Years ago my dynamo packed up, and I used an old Mini one lying around, which work fine – not original though

Keith 1156

 

[Norman AndersonParticipant]

The mounting for my 1953 Slough Light 15 would seem to be a bodge job, to fit a very unusual Lucas generator.

Will replace the generator with a C39 (which I believe to be correct).

Any idea what the part number might be for the correct mounting bracket so that I can sort it out?

Thanks folks!

[Richard LarterParticipant]

The most common Lucas dynamo is the C40 fitted to many cars in the 1950s and 1960s and should be easy to get hold of. The C39 is less powerful and less common, often fitted to tractors and is slightly smaller, 3.9 inches as opposed to 4 inches diameter. What is important is what side of the engine it is fitted as the fitting lugs are handed. I am not sure why earlier cars were fitted with C45 dynamos, this is a hefty unit (4.5 inches diameter) usually fitted to large saloons and would have been close to the exhaust in the Light 15.

Cheers

Richard

[Norman AndersonParticipant]

Hi Richard, planning to fit a new Stealth Dynamator Dynamo/Alternator (conversion 45amp as Lucas C39 & C40). But need to get the mounting right.

The ‘original’ bodge fitting was right hand side. I’ll attach a photo if possible. The mounting bracket looks incorrect.

I do have a correct heat shield for the generator, it’s just the bracket that’s leaving me a little confused.

[Patrick Russell-JonesParticipant]

Hi Norman

I attach a photo of a C39 fitted to my Lt15. I wasn’t able to get a photo of the U shaped bracket that sits behind it – it’s not very complicated except for a curve cut out at the top to follow the curve of the C39 body.

Patrick

[Richard LarterParticipant]

Hi Norman

My car has been converted to an alternator but I agree with Patrick that it should be a simple bracket attached to the long engine/ gearbox bolt.

Cheers Richard

[David FaulknerParticipant]

CTA supply a bracket for the alternator conversion they do which might give you an idea what to fabricate as per the picture below

The wide part fits on the gearbox/engine with a long bolt

• This reply was modified 6 years, 5 months ago by David Faulkner.

[Patrick Russell-JonesParticipant]

Hi Norman

Looking at the bracket in my Lt15 again, it is very similar to the picture David put up, except that it extends upwards a bit more on the right hand side and fits the curve of the dynamo, finishing near the top in board of the end plate (just visible in photo below arrowed). The CTA one looks as if it would do the job for you.

Patrick

[Roger GrixParticipant]

Hi,

Interested to see the pictures. I also thought that my mounting bracket was a bodge especially when I had a spare dynamo lug left sticking out. I see that you both have the same thing.

After mounting my dynamo, I realised that it was not in line with the fan/water pump pulley. After a lot of head scratching and adjusting of spacers, it was still at an angle to the pulley. I can only think that it had always been like that. I ended up having to elongate one of the holes in the bracket to allow the dynamo to sit properly and square in the bracket. The bracket does not appear to have twisted, just welded together or drilled in the wrong position. All seems well now. There is a heat shield available which can be squeezed in between the dynamo and the exhaust. I would recommend fitting one.

Roger

[Norman AndersonParticipant]

Gents, thank you so much for your advice and pics.

I’ll crack on with it and will let you know how I get on!

Thanks again, Norman

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