My WC 21 has a 6 volt system.
The problem is it turns over sloooowly when starting, 1 rev. per push on the starter. :evil:
Sometimes a few revs and that's it
A few observations, for you to consider. The condition may be due to a number of individual or interconnected problems these are in no order so do the easy stuff first.
The starter commutator could be damaged and need facing up,
The mica segments may need undercutting
The starter dog nose shaft could be bent.
The starter switch contacts on top of the motor could be burnt and arcing this will cause heat and a high resistance after a couple of seconds
The starter motor bearings could be worn, you can check this by looking for 'striking' of the armature against the pole pieces in extreme cases,
The brushes could be sticking in the carries or worn down,
The starter earth needs to be really good on all 6v systems, run a jump lead from the starter motor body direct to the battery neg terminal and see if the cranking speed improves, keep it well away from the pos terminal on the starter or you’ll have fireworks !!
Check the starter motor is mounted in line and the mounting bolts are tight on the bellhousing
Check the battery terminals are in good condition and your cables are making good contact
Check your main starter leads are in good condition at both ends
Leave the ignition off and all ancillary items switched off, disconnect your battery and jump a good 12 volt one onto your leads, stamp on the crank pedal there should be a marked improvement on cranking speed, if not some or all of the above may be the problem.
A few more thoughts but this is getting into the scary expensive zone other than the new engine bit.
Has your engine been rebuilt recently ? could be tight bearings and or rings
You may have a misaligned fly wheel starter ring gear
You may have a distorted fly wheel but this would be extreme
If possible I use someone to press the starter (my 6 years old nephew or brother) and apply I the handcrank which works. :roll
I would not advise this at all, this is a very good way to break your wrist I suggest you give this a miss from now on. 4l of engine and a steel starter crank can snap your wrist like a twig not good don’t go there.
My battery is 120 AH
This should be is ok,
Hope this may be of help, at one time or another I’ve come across all of those problems above, the big thing is don’t panic and go for the big problems it’s usually the just a bad earth
Pete