I think you just need to tighten the pre-chamber collar...it real easy if you have the special tool, otherwise use needle nose pliers (not great) or some other means to turn the collar. I thing you will find it is very loose.

Mark

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1984 300TD Wagon, 407,800 mi (current daily driver)
1985 300DT Sedan, 330,000 mi (gone to that great autobahn in the sky)