So this is in regard to my Mk1, engine is A+, bored to 1293cc 1500 miles ago and fully rebuilt by Bromsgrove Engine Services. I was using an old starter motor that was circa 20 years old until Feb 2019 when that failed (local auto spark said the brushes were worn) and I bought a new one from Minispares.
I have covered around 200-300 miles with this new one, it had a bit of odd noise from new but I thought nothing of it, as the old one I took off was 20+ years old, so I thought this must be how they should sound.
Only when I got home and took the starter off did I find out it was per the photo below.
I went to Minispares and they said they had only ever seen this (see below photo) when an engine was Hydro locked, my engine certainly isn't, as I drove home.
Anyway, they sold me another one, and I fitted it, and it works fine.
I asked Minispares to send off for investigation, and this is there reply:
"We have very low return rate for this starter motor. The current return rate is less than ½ % (half Percent)
There are few reasons for a Nose cone to break.
1. If the starter is not fitted & aligned properly with the ring gear it may cause starter nose cone to break.
2. Engine backfire has the potential to damage the nose cone.
3. Excess Vibration from the engine & long engagement of starter pinion with fly wheel may also cause this.
We would also recommend checking ignition timing.
We can assure you that the starter motor has passed through various quality checks prior to release therefore it is absolutely up to the standard."
1. It is fitted correctly, I mean it seats fine and I it ran for hundreds of miles with no issue!
2. ​ It hasn't back fired.
3. I can't think why there would be excess vibration.
The engine was rolling road tuned and obviously ignition timing all set by Novatech, so I have no issues with that.
I have no beef with Minispares, obviously they are just selling what they are supplied. I am more interested in why this might of happened, and to prevent it happening again.