The usual way to remove a rotor from a tapered shaft is to extract it using a piece of rod passed down ihe centre of the rotor shaft and screwing in a bolt on top of the rod. Unscrew the threaded shaft in the rotor and you should see the extraction thread. You have to make sure the extraction rod is small enough to go through the thread on the crankshaft.

Mick

I have just spoken with my mate who is an electronics engineer. He says that the 2 windings are wound together and if they are wound round a core of the same dimensions as the lister core it should perform the same.
I have a 1951 2.5kw SOM in storage and will go over and measure and take a picture of the choke in the next few days if you like.
The other thing he told me was that the bridge rectifier should be rated at 500 volts because it is connected to the AC side of things and it was impossible to tell from the wiring diagram what voltage is going to it. Unfortunatly my 2.5kw SOM is not running at the moment so I cannot take any voltage readings at the bridge rectifier.

Mick

Somian
If you are intending to use a shoveit radiator you will definitly require a fan of some description a chevette radiator is a bit small. When I used a rover 820 rad I had to run the fan all the time. The radaitors that the other guys are using are massive compared to the rover one I used. A bigger rad is a good idea and you can blank it off if it works too well as the other guys have said. Just one more point consider fiting a thermostat as they really help.

Mick

Radiator cooled Lister cs worked on thermosiphon  and had a fan run from a pulley on the crankshaft.

When I fitted a rover 820 radiator to my 8/1 engined startomatic I found I needed to run the 12vdc electric radaitor fan all the time.

The V belts are B section 105 inches long

Mick

Third time lucky


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Doug

Here are some prints for you to peruse.






1.The  Alternator is of the self-excited rotating armature type. The armature carries two sets of windings, one the A.C. winding which is connected to a pair of slip-rings and the other the D.C. winding which is connected to a commutator and provides excitation current to the main field system. The alternator also incorporates series starting windings which combine with the D.C. armature winding to act as a series motor for cranking the engine.

This information is from a 1959 Lister manual.

I got a striped down 4.5kw startomatic alternator I decided to have a go at rebuilding it myself. I got as much information about it as I could all of the above and more field coil resistances,  brush sizes, brush material, bearing sizes and worked how it all went back together. There were loads of missing bolts a broken brush holder I tested the resistances worked out which wires went where  i got new brushes made, got the commutator and slip rings skimed, bought new bearings, made a new brush holder from 10mm tufnol rod, bought new BSW and BA nuts  and bolts. I rewired the top box to Lister push button remote control design this does away with the startomatic box and makes life easier for me

Commutator skim   Â     15
Bearings      Â               35
Brushes      Â Â               56
Bolts         Â Â                20
Brush holder      Â          6
Heat shrink   Â               2
Flexible  mountings      6
Relays & Switches   Â Â Â 20
Wire         Â Â                 7
Connectors      Â Â           5
                  Total      172 gbp


Here are some pictures of what I started with but unfortunately I didnt take pictures of the rebuild when I did it but will if anyone is interested.













Mick

I have replaced the bridge rectifier on my 4.5k start o matic alternator with a 50volt 25amp bridge rectifie out o a 12volt battery charger. It works fine.
Are you changing the brushes if you are you can get them manufactured  a lot cheaper than buying geniune ones
Lister DC brushes cost 16gbp each and you need 4  Lister AC brushes cost 12gbp each and you need 4 You can get them made for about 6 gbp each. The firm I used was  http://www.sdcarbons.co.uk and I was very happy with their service. If you need brush dimensions and specs let me know.

Mick