Carefully and at the Injector, Slacken each steel-fuel-line in turn, then re-tighten.
--It helps to put cloth over/around the nut, as diesel fuel will be ejected in squirts...
IF the regular Knock/Noise goes when one is slackened--That cyl/injector is the problem.
Take care with the diesel-fuel that squirts out, it is under very high pressure and can injure you--Must use a cloth over the injector pipe-nut
ONLY do this test with engine Idling, and only long enough to identify if that injector is causing noise. Fuel force when faster than idle is very high...
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http://i190.photobucket.com/albums/z...0TDnoplate.jpg
Alastair AKA H.C.II South Wales, U.K. based member
W123, 1985 300TD Wagon, 256K,
-Most recent M.B. purchase, Cost-a-plenty, Gulps BioDiesel extravagantly, and I love it like an old dog.
W114, 1975 280E Custard Yellow,
-Great above decks

needs chassis welding--Really will do it this year....