Valve spring, oh ! This is the most important part for the performance of a motor, so it's completely no useful if the part is unreliable on earth however highest performance it may be armed with.
The fault on the part of the motor means it's unreliable and useless with no worth.
Then what will happen if valve spring is defected ?
The valve falls down to piston top direction without moving distance control by spring tension, partial hitting on a part of valve outer circle causes too far valve traveling to the direction to piston top dead center position.
The valve stem would be distorted by piston top surface leading to the compression pressure leakage with loosing precise fitting with valve seal.
By the way the happening this time is capable for biggest TOYOTA ?
Distributed mechanical engineer can replace spring parts so safely ?
32 springs must be replaced per a V8 motor ?
Where and who will do that ?
Tremendous number of TOYOTA motors all over the world exists ?
This affair must be the worst one since the company has established more than half a century ago, might be a some fatal reason ?
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