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Blown headgasket or Piston rings? 700

posted by  Rolyak on  Wed Oct 26 16:20 CST 2005
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last visit: Fri Oct 24 08:03 CST 2014
[RELATED]

You lose the coolant, the engine overheats, trys to seize because the piston skirts have expanded beyond their normal size, the oil film deteriorates and metal to metal contact occurs. This is known as a scuff, both the rings, cylinder walls and skirts are damaged.

The rest of the story is that the castings (head and block) overexpand crushing the gasket and elongating the fasteners (headbolts)

When the engine cools down the pistons contract but it is likely that the rings, pistons and cylinder walls are severely damaged. (no compression?)

The crushed gasket (collapsed bore flanges and body material)can no longer follow the normal expansion and contraction of the normal thermal cycles. (heating and cooling) The gasket allows coolant leakage internally and possibly externally. Compression, if there is any will migrate to the cooling system.

The bad news is that you overheated the engine and the mechanic has no responsibility.

I would pull the head and see how bad the cylinder walls look. If the timing cover backing plate is melted then it was pretty severe.






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