I have posted about this before and thought that it was related to the timing chain, but after a new tensioner, chain, and tensioner rail the noise is unchanged. It seems that I have an odd noise because I have searched through the archives and can find nothing similar. It is a loud rattle/knock that seems to come from the top end. The noise increases frequency with RPM increases but the intensity never seems to change. The engine runs great good oil pressure (about 2 bar at hot idle) does not smoke, and doesn't use oil.

I have had this to various people that know these engines and they say they have never heard anything like it. But their theory seems to be that it is something related to a wrist pin or the prechamber. The noise changes but doesn't go away when the #2 injection line is loosened, and none other cylinders effect the noise. I pulled the oil sump earlier and no metal was in the pan and rods looked good and tight, so at this point I am stumped. I will probably pull the head off at the least or pull the engine to find out what it is before it ruins my engine.

Thanks in advance for any help you can give.

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1993 300D 2.5 Turbo (blue/ blue tex)
1991 350SDL (White/ Gray leather)
1983 300TD Turbo 5-speed manual (Green/ Beige)
1985 300SD (Black/ Black Leather)
1985 300TD (White/ Green Tex)
1980 300SD (Astral Silver/ Black Leather)
1990 560SEL (White/ Gray Leather)
1993 300SD (Black/ Black Leather)
1967 200D (Green/ Beige Tex)
1969 300SEL 6.3 (Moss Green Metallic/ Green Leather)
1975 300D (Astral Silver/ Green Tex)
2001 Ford Excursion Diesel