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Cracked Cylinder Head


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My Boxster 2.7 2001 (manual) now with 30,000 miles was recently minor serviced and running beatifully. 10days later it was driven 14 miles to have its rear bumper replaced. When returned I noticed yellow goo (emulsified oil and antifreeze)around the oil and filler cap and leaking from the underside of the engine compartment. Drove it round the block, engine running fine no signs of smoke but slighly hotter than normal. Checked oil dipstick which seemed fine but more yellow goo in water resevoire.

Flat-beded to main dealer and told they think it is a cracked cylinder head because a pressure test revelead a leak in one of the cylinders.

Why would they think this is the problem rather than a blown head gasket. ?

Could this happen if someone had over revved the engine?

Why would 5 year old 30k porsche with FPSH crack its cylinder head ?

Any help on any of the above would be much appreciated !!!

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On most cars this would probably be a blown head gasket but on the Porsche M96 motor I believe it is quite rare. My guess would be a slipped or cracked cylinder sleeve which I think is more common than a cracked head. Unfortunately this can surface at any time without warning and has nothing to do with how carefully or aggressively the car is driven. It is a design and or manufacturing flaw that has surfaced and will most likely require motor replacement. I hope my hunch is wrong.

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