[Mgs] Lucas 25D rebuild advice...

[Paul Hunt]

For reassembly take pictures or make notes as you dismantle, it's all pretty 
obvious how it goes together, apart from the visible bits there are only two 
springs and two weights under the points plate.  Whilst the two weights 
should be the same, the two springs should be different, but it doesn't 
matter which spring goes where.  The bit that *isn't* obvious is that the 
top half of the spindle fits to the lower half in one of two positions, i.e. 
180 degrees apart from each other, but only one of them is strictly correct. 
This is because the lower half is keyed to the drive gear in the block with 
an offset slot and dog, and the rotor is keyed to the upper half with a 
keyway.  Get it wrong and the rotor will be 180 degrees out to how it was 
before.  It's no big deal as you simply move the plug leads two positions 
round the cap, but to get it right note the relative positions of the dog 
and keyway before you start.  Look carefully, as the dog and slot are only 
just off-centre.

If you haven't changed points before it is quite common to get that assembly 
wrong.  A stepped insulator goes on the threaded stud first, step facing 
upwards.  Points next with the hole on the spring fitted over the step. 
Next the condenser and coil tags, in either order.  Next another stepped 
washer, this time with the step facing downwards, going through the holes in 
the two tags and the spring.  Finally the nut.  The stepped washers keep the 
points spring and tags clear of the grounded stud, if they contact it the 
points will be shorted out and the engine won't run.

There should be a very flexible braided ground wire between the moving 
points plate (moved by the vacuum capsule) and the body of the distributor. 
If this is in bad condition you can get no or intermittent current flow 
through the coil.

PaulH.

----- Original Message ----- 
> Hi there, I have never rebuilt a distributor before, so I am looking
> for online resources such as PDF files that show the "Blown-up"
> diagram that shows how it all goes together.