A manufacturing defect with the piston seemed to be the culprit.
Thanks to Basant Kumar Naik for sharing the information. Heartfelt gratitude for sharing it with other enthusiasts via this Team-BHP share page!
I Basant Kumar Naik, owner of a 1-year-old MG Hector bearing Reg. OD02BQ0063; would like to draw your attention to a very serious matter of a life and death situation while driving the vehicle (MG Hector). I along with my family was travelling to Bhubaneswar from Bhawanipatna which is nearly 400 km. After covering about 130 km at a speed of 80 km/h on the national highway, the vehicle stopped on its own, which might have put my whole family in a life and death situation where there was no coming back. Somehow by god’s grace we all are still alive.
We immediately sort help by calling the showroom as well as the RSA. The vehicle was in no condition to drive cause the engine was vibrating like something I have never seen. We somehow managed to reach Bhubaneswar by cautiously driving for more than 8 hours, concerned it might happen again. After reaching Bhubaneswar, I sent the vehicle to the showroom to find the cause of the issue. After 3 days, by opening up the whole engine they found that the issue was caused due to a manufacturing defect with the piston which had broken on its own. There comes another risk which again has put me in danger as its a petrol engine and a broken piston could have caused a fire due to friction.
The showroom assured me they will change the part, but as of now I don’t want to change just the part, I either want a new vehicle or the whole engine to be replaced with a new one. As the whole engine has already been opened and its a defective one.
This is for your kind information and necessary action. Images attached.
Here’s what BHPian Jeroen had to say on the matter:
Sorry to hear about your misfortune. I don’t understand why it took them three days to figure out it was a broken piston? That sounds a bit odd to me?
How did they conclude it was a manufacturing defect?
I also don’t understand how the engine apparently stopped working altogether, but then afterwards vibrated? Ant it was driven for eight hours in this state? Was it started again and did it fire up? And then you drove it for eight hours with a broken piston?
I think there is more, much more, to this story. Would love to hear.
My guess, it overheated, cooled down and was restarted without fixing the problem, ultimately the piston broke. I can think of a few more scenarios, but driving an engine for straight hours, whilst it is vibrating and then concluding it’s a manufacturer if mistake seems to tell a story to me?
We need a lot more details before we can come to any kind of conclusions, I think
Before any esteemed members start drawing conclusions let’s just make sure we really understand what happened here.
Here’s what BHPian mayankk had to say on the matter:
Something happened with the timing of my Tucson years ago, and the piston met the valves with a horrific clang. The immediate vibrations were so bad that the car was rolled to a halt in 10 metres and I only allowed it to get towed from there, in the middle of the road, to the mechanic.
I am surprised that this person ignored that and drove for eight hours! In that case, I will commend MG! What a fantastic engine block, that it survived.
In any case, following this thread to either have the other side told, or to be fairly warned as an owner.
Here’s what BHPian ssjr0498 had to say on the matter:
My observations from the pictures of the block and some from my engine building experience!
I feel you can have a MIL for a “knock” or “detonation” there can’t be a MIL for a piston failure!!
Also, to add to your points:
- Engine oil was less or coolant was low – Possible
- Engine started overheating during the journey – Block doesn’t show head gasket failure, around any of the other 3 pistons
- Piston was weak and gave way due to overheating – Possible that the piston had a casting flaw, but overheating doesn’t look like the cause
- Other pistons also got intermittently stuck due to poor lubrication and overheating- Again, doesn’t look like overheating
- Engine vibrating heavily at higher RPMs – Obviously with 1 cyl giving no power the imbalance in the engine was causing the vibrations
- Owner drives in limp mode with low heat generation, avoiding stalling the engine. He may have taken a few breaks which further cooled the engine down.- I drove my honda with a broken ring land/cracked piston for over 110 km, the only symptom being that the crankcase breather was smoking!! No other issues whatsoever!
- In essence, it may be possible that the last service was deficient and engine oil or coolant was not optimum when the journey was performed. A piston that endured a million fuel blasts on a 10k driven car, cannot break without any external(frictional) force – It has an insane amount of force within, so if it were a casting flaw (weak piston) it would crack the way it did! If you notice the sides of the cracked piston, there are no symptoms of a piston to wall impact due to low oil or coolant entering the combustion chamber!
Check out BHPian comments for more insights and information.
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