http://www.w123-world.org/showthread.php?t=15

If you look at the right side cross section (looking striaght on) there is a bump out at about 9 O'clock along the block near the rings on the pistion. That is close to the factory freez out plug heater. If you remove the air filter and get a flash light, it's a bit eaiser to see.
I'm a bit confused bt your sig though (300DT)... do you have a wagon (300TD)
or a 123 sedan (300D)?

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