CAV BS5 starter motor - current draw

[agg221]

21 hours ago, BEngo said:

Could I have a link to the electrical equipment manual please?  Google does not find it for me.

 

N

 

 

Apologies for the delay - strange forum error kicked me off and asked me to respond to a verification email, but it wouldn't send one! This now seems to be resolved - link is here: http://www.sky-net.org.uk/kelvin/equipment/ee/index.html

 

Alec

[BEngo]

Thank you.

 

N

 

[agg221]

Next update.

 

I have swapped a correct pinion on to a 12V starter motor. I have no idea whether the motor works and no sensible way of testing it other than fitting it and trying it out, but no particular reason to believe it won't. The motor is different in that it has an oil cup for lubrication, so to get that to work I would have to place it the correct way up but the alternative would be to swap it for the fittings in the 24V one.

 

Changing the pinion was not quite as straightforward as it could have been. Firstly, the second nut needed a slim 3/4" AF spanner and I didn't have one, but a bit of work on an already butchered 19mm spanner that came in a box of scrap soon solved that one. Next issue was that the second nut was stuck firmly on, eventually solved by temporarily re-fitting the castellated nut with a suitable size rod through the split pin hole and turning one against the other - came off easily once free. Removing the pinion itself was simple.

 

Refitting was a bit fiddly. Although I had the motor upright and rotated the pinion as I extracted it, the plates still rotated relative to one another. Just screwing in therefore didn't work as the plates slipped round with the pinion. The technique which worked for re-insertion was to sort of gently lift the pinion and rotate and put it down again in little steps, sort of gently tapping it onto the plate below. That stopped the plates slipping round and eventually I worked it through all three. Now reassembled and ready to take to the boat on Wednesday.

 

Alec

[john.k]

Before refitting,take off the pressed end cap ,and try the trigger mechanism in the contactor coil assy .......pull the pinion out with one hand ,and put your finger on the contacts ......as you pull the pinion out,the trigger should release the contacts ,and the contacts click closed .......normally ,the magnet coil does this ,but with no lekky ,your finger does .............If the trigger notch is worn and doesnt hold,it can be filed square again .........also check the thickness of the copper contact bars ........if they are very thin ,it  will need the whole coil switch mechanism replaced .......although some clever people have silver soldered a new piece of copper on.