I have been searching...

I am taking my 85 300TD to my mechanics tonight to have an OEM block heater installed. He will have to remove the freeze plug. I know he is a good diesel mechanic, but he does not regularly work on Benz`s and probably hasn`t done this job before. I would like some suggestions I could give him to make it easier. I have a goofy aftermaket air intake (don`t ask) so he will be able to get at the plug from above, I think.

So far I will suggest..

Drain the coolant
Heat the plug, but not too hot as to crack the block
use a big honkin 3,4 inch wrench with a breaker bar

whats the wrench size

Anything else!

Thanks