MG4 Reduction Gearbox Broken (first in the World???)

[nexia201]

Sounds like as the OP mentioned that the dealer missed an oil change, so can't blame MG for this failure. The casings will be well within their design envelopes to handle the power and torque of these motors. It could also have well been a faulty part from the factory, happens to all makes and models. Lots of MG4s with similar or higher mileages as they are a popular model for taxi service in many countries and no other reports of anything similar.

I had my oil changed every 60k km, and the drive does not worry me as we have quite slippery roads so it doesn't put much strain on the gear, in fact it will spin slightly. The only thing that worries me is when there is a step on the road surface, and the wheel, when it's in the air that split second, spins, and on touch down it gives a shock to the reduction gear.

 

[Macadoodle]

I had my oil changed every 60k km, and the drive does not worry me as we have quite slippery roads so it doesn't put much strain on the gear, in fact it will spin slightly. The only thing that worries me is when there is a step on the road surface, and the wheel, when it's in the air that split second, spins, and on touch down it gives a shock to the reduction gear.

Very true, feels quite violent when the traction control cuts in and out on those occasions.

Your 60k km oil changes are probably a good idea, I would imagine that the film strength of the lube in this box thins quite quickly due to the limited quantity that's in there by design.

 

[nexia201]

when you say 'boom' what was the failure? casing blew out ? Makes me think that a 40k mile oil change might be a good preventative job on these reduction boxes.
I also don't tend to use full acceleration just for the hell of it as I think the casing is pretty thin from the pics I've seen, might not cope with high axial load long term.

Havent checked yet but something broke and car lost drive , when i put in drive you hear motor turn and grind slighty