well i took the car to a diesel injection pump shop to have someone look at some leaks i had coming from it. after looking at then pump for a few minutes they pointed out the the element had been moved and he was shocked that the car was even moving, wouldn't go faster than 50 and would heat up quickly. he pointed out that the brass had darken over the years and that we might be able to move the element back into the shadow and see if it improved. other wise it would be $1200 for a rebuild. That was 2 years ago and the car still runs a little on the hot side at high way speeds, about 90c. i noticed that the piston that was related to the element in question was much cleaner than the other's. it was also the one i though would have been the worst off as that is where the knock sounds like its coming from. but in fact it looks to be brand new compared to the others.

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84 300sd 2.47 dif 360k
26 mpg needs lots of love
given to me in pitty

89 civic hatchback auto 140k
33mpgs soon to be low to mid 40's
been in the family since mile 1

85 300d with unknown knock. driven over 30k with knock and still going. sold for $800