Stripping the old engine of the Powergen and assorted hardware brought a problem to the forefront that I had been avoiding as I didnāt really know what do with it.
So, way, way back when the car was first put on the road it had this frustrating fault of destroying fan belts. Iām talking shredded to bits in 25 miles type of deal.
The Powergen pulley was always prime suspect as being at fault.
An old dynamo was dug out and the pulley robbed and fitted to the Powergen.
The problem disappeared.
Fast forward nearly 15 years and a potential issue comes to light.
When I shortened the Powergen case, covered way back in this thread, I threw a volt meter on it and realised it doesnāt actually charge at idle!
Bringing the revs up off idle brought the voltage output straight back to normal values.
Now this had never been an issue but swapping over to the electronics could open myself up to issues if they fail to receive a consistent 12v.
The replacement pulley was much larger than the original which is where the problem came from as the Powergen was spinning too slow at idle.
I found the original pulley but on fitting it was missing a spacer of some sort.
This may have a blessing as one of the things I wanted to check was pulley alignment.
With the pulley mounted in a position guesstimated of where it originally sat I had this.
Not good.
The pulley was slid out to a position that put the belt in alignment.
But that left me with the pulley here.
No way was it in this position originally. Maybe this was the reason for the belt destruction? š¤
Likely the original nut was shouldered and the pulley solid so I could bore a recess into the pulley to allow for full nut engagement with the pulley in its new position.
All that was left was to remount the pulley in its new position and mark the shaft for spacer length.
And the spacer made.
With the Powergen back together and mounted on the car I could check the belt grip on the pulley.
The instructions say that you should be almost able to turn the engine over from the alternator pulley.
I thought this was a little excessive but took from that it should be fairly tight!
The pulley still seemed loose inside the belt.
So there I am levering away, trying to get the belt tighter and tighter and the casting broke. š¤¦āāļø
It was inevitable that this was going to happen at some point I suppose.
The aftermarket relocation dynamo bracket should put the dynamo /alternator perpendicular to the head. This never worked for me as it put the Powergen to far out to the side which put it out beyond the bonnet side.
Fun fact: ā36 Fords have the smallest engine bays of all the pre-war V8ās.
What I did was file the original bracket guides so the Powergen could stand more upright and use a bolt head to put some guide and support back in.
All this left reduced material in localised areas.
It now needed something more substantial.
The guide slot was 5/8āish and I found some 5/8ā square stock which was a nice fit.
Drilled a hole the same size as the mounting stud.
This was then halved.
This gave me one fixed end that I could rotate into any position.
I wanted to use the tapped hole that was already in the bracket from the previous locating bolt head but it was a little on the large side for the 5/8ā stock and assuming it was UNC or possibly Metric, it was neither.
I can only assume it was Witworth that I used!
Deciding on a new fixing I went with a much more sensible 1/4ā UNC.
The new guide was positioned and drilled through with the 1/4ā tapping drill size and then the new guide was opened up to a clearance size.
I had a cap head screw to use which would be much neater if I sank it into the guide.
The guide was drilled for clearance for the screw head at a depth just shy of what I wanted.
I then used a drill bit ground to achieve a flat bottom.
Mounted up.
Trimmed and finished.
All mounted back on the engine I could really lean on it now and still couldnāt get the pulley to grip the pulley.
I started looking at the belt which was looking tired I went off to order a new one.
I noticed I could get toothed belts in the same size so started looking at these.
Iād always run standard āBā sized Vee belts.
Apparently these can only go so far down in radius size hence toothed belts which can bend to a tighter radius.
Another potential problem area maybe?
Anyway, hereās where Iām at. I hope it doesnāt slip.