THE INTERNATIONAL JAGUAR 'S'-TYPE REGISTER FORUM

All Johns points are valid and the only thing I would add is Does the pulley on the front of the C45 dynamo line up with the crank shaft pulley and water pump pulley with this new bracket.

As John suggests I would have the C48 (I thought the S Type was fitted with a Lucas C42?) rebuilt which might cost a couple of hundred dollars or bite the bullet and go for a Dynalite (alternator) replacement. Identical to the C42 body with the PAS take off on the back but the benefits of being an Alternator with negative earth. https://simonbbc.com/dynalite-dynamo-to ... -steering/

Thanks John. BTW I implemented your tip about suspending the weight of the dynamo and it made it quite a bit easier I think. The replacement has the proper PAS arrangement so no problem there. I think the PAS hoses will be OK too. I will put it in place and check out the fit before I go too much further. But a will also get the C48 checked out.

Thanks Rob. I was thinking that the higher mounting would make subsequent dismounting less of a hassle and really can't understand why they went with complicated low down mounting when the higher mount point was already available. I have thought about the Dynalite but it's pretty spendy. Once I get the car to a point where I know it would be worth the investment I might go that way. All part of the journey.

The lower mount might have been to accommodate the rather tall York compressor that was used on some of the after market accessory air conditioning systems. You will also see an indentation in the inner fender to clear the compressor pulley but it still requires relocation of the glass jar screen washer. Jaguar had not got round to a factory AC system but they may have been making accommodations for the aftermarket ones.

And FYI, the C32 generator has a cutting in speed of 1250 RPM, with max output of 30 amps at 2200 RPM. C48, 850 RPM cutting in speed and max output 35 amps at 1650 RPM. I'm assuming that is generator RPM not engine RPM. Info from the workshop manual.

Well, I have test fitted my used replacement dynamo, using the higher mounting bracket and it looks like it will fit OK. But - because it sits a little bit higher I fear that it will place the PAS pump way too close to the exhaust manifold. Is this likely to be a problem? In PAS S-types is the Dynamo placed on the lower bracket for that reason?

I am not sure if this would be an issue but as a work around you could consider wrapping the front exhaust manifold with insulation. Do an Ebay search for Exhaust Manifold Insulation. It comes in multiple colors, looks much like seat belt webbing and is held in place with stainless steel tie straps. Of course this covers your nice porcelained manifolds. I have used this successfully on the rear portions of my 1990 XJ6 to prevent fuel pump vapor lock.

Thanks John. I have some of that stuff left over from a previous project. Maybe a fabricated heat shield over the pump would do the job. I am going to get the faulty dynamo assessed and may end up putting it back in anyway.

My car was manufactured in September 1967 and it has a stainless steel heat shield fitted as standard over the top of the PAS pump.( See photo.)
On the back of my PAS pump there are two screw holes which allow the shield to be bolted to the pump protecting it from the majority of heat coming from the exhaust manifold. I know I have some close up photos of the shield off the car but I cannot locate them at the moment. If you are raising the position of the pump some form of heat shield is essential. Not all the PAS pumps have the holes in the base plate. I have two spares one has no holes (from a 1966 S Type) the other has four holes (don't know the origin) and my original pump has two holes for the bolts.

Thanks Rob. I am thinking that the higher mounting will not work, partly because of the heat problem but also because it will probably be near impossible to get at the bolts attaching the PAS pump to the dynamo. I will see if I can fit the replacement into the lower bracket but also get the old one checked out and maybe overhauled.

BTW, I would replace that engine mount as well...