Quote:
Originally Posted by Jamesp
Pull the plugs and look at each one. If it is a cracked head the clean / wet plug (or rusty if the engine has not been run) is the cylinder of interest. If they are all the same, it's not coming from the cylinder. next stop is the oil cooler. The head gaskets are bullet proof in this engine and an unlikely failure. Cracked heads are not uncommon, but can be welded up and used again.
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As the link above indicates it is possible for the pressurized coolant to leak directly into the oil ways. This would leave little evidence on the plugs. 9xx Motors(Jason) a well regarded local engine rebuilder has a good video showing several such cracks.I'll try to find it.Hoffman in the links and narrative in my previous Post also covers this
https://www.youtube.com/watch?v=rtbXu0jji-s
https://www.youtube.com/watch?v=2wQhkvUHkDc
But James addresses the initial difficulty of diagnosis with the engine complete and running. The pressure tests linked are
after a convincing diagnosis because removing a cylinder head is a lengthy task.For example .if the head pressure tested good and then you found the intermix was cused by an "O" ring failure on the Heat X ,you would be miffed.So diagnosis is the critical task.The repair is 'easy'
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