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Checking valves for leakage

Remove cylinder head
Turn head upside down, with spark plugs still installed.
Fill combustion chambers with gasoline or a similar thin liquid.
WARNING: Do not use Silicone fluid, this will lead to oxygen sensor damage after installation of cylinder head.
If liquid runs past the valves, inspect valves and valve seats.
Remove and install valves
If required, machine valve seats

 

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E30 M3 Repair Manual V2.7.  Copyright ©1999-2001 Koala Motorsport & Brett Anderson