I am replacing the cracked head on my M42, Using a E36 M44 head. Reading the E36 Bentley instructions as the E30 Bentley does not address the M42. It says to make sure the No Return Valve is installed correctly. My M42 appears to never have had one. There is one installed in the M44 Block. RealOEM shows one in the diagrams. Items 9 and 10.
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"No Return Valve" ?
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I think Toby may be correct as neither of the E30 M42s I've had apart had that valve either when opened or closed back up. If it were necessary to protect the engine I suspect my daily would have grenaded a long time ago, but then I'm not in the habit of taching it out as soon as I start it up.
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