Lucas dynamo identity

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  • 18th November 2018 at 2:37 pm #24041
    189
    Participant

      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

      18th November 2018 at 4:27 pm #24042
      David Faulkner
      Participant

        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.

        18th November 2018 at 5:08 pm #24043
        Alistair
        Participant

          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

          19th November 2018 at 12:17 pm #24044
          189
          Participant

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

            David 189

            24th January 2019 at 10:38 pm #24404
            1156
            Participant

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

              Keith 1156

               

              25th March 2019 at 10:52 am #24631
              Norman Anderson
              Participant

                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!

                25th March 2019 at 11:23 am #24633
                Richard Larter
                Participant

                  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

                  26th March 2019 at 11:35 am #24638
                  Norman Anderson
                  Participant

                    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.802XUD_54

                    27th March 2019 at 11:46 am #24642
                    Patrick Russell-Jones
                    Participant

                      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.

                      PatrickC39 fitted in Lt15

                      27th March 2019 at 7:37 pm #24645
                      Richard Larter
                      Participant

                        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

                        27th March 2019 at 7:48 pm #24647
                        David Faulkner
                        Participant

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

                          21571

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

                          • This reply was modified 6 years, 5 months ago by David Faulkner.
                          28th March 2019 at 11:29 am #24652
                          Patrick Russell-Jones
                          Participant

                            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

                            C39 fitted in Lt15 2

                            28th March 2019 at 3:59 pm #24654
                            Roger Grix
                            Participant

                              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

                              1st April 2019 at 8:59 am #24664
                              Norman Anderson
                              Participant

                                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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