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Blown Head gasket or worse? 700

posted by  Rhys on  Thu Jan 6 16:22 CST 2011
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last visit: Tue Nov 20 10:22 CST 2012
[RELATED]

With overpressure in the cooling system it's probably a blown gasket. Cracks don't let that much pressure in, although they will produce very tiny bubbles in the coolant.
The head has to come off. If you pull the spark plugs you'll find out which cylinder is affected. Once the head is off, rotate the engine around for a while, and oil the bad cylinder to prevent rust, and drain the oil.
The head may be warped. Some good machine shops can re-heat the head on a fixture to straighten it before surfacing. The warp can cause the cam bearing bores to be mis-aligned, so just surfacing the head doesn't help. It has to be straightened first. It's also possible that the head is straight, just a blown gasket. Have it checked though.
Good luck!
Rhys






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