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Cambelts changed now problem with valve seat?? linked??



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  Renault Clio 182
Had all belts changed along with a dephaser pulley. All genuine Renault parts. After the works was done there was a tappy/ticky sort of sound when accelerating. I thought nothing of this as I knew i needed a new airfilter, i assumed it was that. I was driving down the A120 4 days later doing about 70mph. When the revs went past 4000 the car started to jerk every few seconds. Then all of a sudden all power was lost and once i grounded to a halt the engine wouldn't turn over. When the green flag man turned up he got the engine started but it sounded like a lot of banging a clunking was going on.
been to the mechanic, he said to me that the valve seat has come away and broken off which is what caused the damage. 1 of the spark plugs is about 10mm shorter than the rest where it has been blown to pieces.
I have spoken to a specialist and they seem to think that there is no way the valve seat would go just like that and the only thing connected to the valves is the belts and the gearbox.
he said that there is nothing wrong with the work that was carried out and the timing was spot on.
I dont have more than basic knowledge about engines..
should i trust this guy or is he trying to cover his tracks??
Please help!!!
 
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