Head gasket, not always - MINI Cooper Forum

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post #1 of 4 (permalink) Old Apr 15th, 2014, 10:32 PM Thread Starter
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Head gasket, not always

Just a little help for anyone that has had major head aches with "head gasket"
Started with the usual mayo in cylinder head. R56 N14 2008

Replaced gasket, checked head, did not look like it needed skimmed.
One month later after more mayo and 2 oil changes, still coming back. Not as thick but still present.
Decided to redo head gasket this time got head skimmed.

Exact same result. New bolts were used in both changes. Torqued correctly Correct oil used and not overfilled.

Studied engine diagram as 3 failures on gasket would be as much luck as winning the lottery. Only other place I could see oil / water possibly mixing is oil cooler.
Ordered gasket sets. M11.42.7.557.009 and M11.42.7.557.010 (£31.61 for both) cleaned oil cooler and checked cooler and filter housing for cracks, all ok.
Replaced oil and coolant not a drop of mayo has appeared for the last 700 miles.
Dealer told me they have never ordered these gaskets before.

I can sleep again and drive car as it should be driven, with sport on.
Hope this helps anybody in same position.

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post #2 of 4 (permalink) Old Apr 16th, 2014, 08:18 AM
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Mayo is not always the sign of head gasket problems, it can build up excessively and clog the engine breather system causing oil leaks and can be caused by the engine not warming up fully due to too many short journeys in cold weather or a thermostat problem, the moisture and condensation that forms due to the combustion process and oil is the mayo.
Now the weather is warming up and more people are using their car on longer holiday journeys the mayo will evaporate and disappear as the car reaches full operating temperature for longer periods.

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post #3 of 4 (permalink) Old Apr 16th, 2014, 08:44 PM Thread Starter
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I believe the cylinder head was one fault to start with, the engine had overheated on a 700 mile trip, due to faulty thermostat. It then had cooling fan running in stage 2 as soon as engine started and stayed on for a further 5 mins after car stopped. I was able to clear this after changing thermostat housing with new sensor, but other damage was done, head gasket and oil cooler gasket.
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post #4 of 4 (permalink) Old Apr 29th, 2014, 06:18 PM
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Ouch that does not sound fun
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