Grinding/rattling Noise from engine accelerating on both idling and driving

[ahsan.pmd]

I am facing an issue of a rattling/grinding noise from engine left/lower side. Car is cultus 2006 non-efi and running on petrol. Inside cabin while driving it feels like exhaust leak noise when accelerating but noise from open engine bay is like metal grinding noise. I feel it more when I put my ear close to the timing belt cover.
One mechanic said it is from crank while one said it is from piston rod. I want to avoid unnecessary hit and try by mechanics and wish to have a proper diagnosis first. I have uploaded the video showing engine noise. Please have a look and advise. Thanks in advance.

[hash4u]

@Xulfiqar

piston slap sound ?

[xenerking]

one pistin rod/ big end

[ahsan.pmd]

The noise starts to come when engine has warmed up. The cold engine has no noise

[ahsan.pmd]

The noise starts to come when engine has warmed up. The cold engine has no noise

[Xulfiqar]

Thats real real bad. Sounds like a spun rod bearing.

[ahsan.pmd]

Performed a complete engine overhaul with 46k bill im hand. Lets see how long engine stay alive now

[xhaikh1]

You have to take it back to that mechanic who did his experienced ustaadi.

[ahsan.pmd]

why?

[ahsan.pmd]

after opening engine it was found that one cylinder was worn out and needed re-bore similarly crank needed grinding and head also needed valves work. so ultimately a full overhaul was done.

[xhaikh1]

Is that mechanic is your relative why are you resisting to visit him again.
You just pay him the visit and let him diagnos it that what have gone wrong with your engine.