Quote:
Originally Posted by tjts1
If there's any question whether or not a 14 head is cracked, instead of pressure testing it I would clean it thoroughly and check it with fluorescent dye. If a crack hasn't reached the coolant system yet it will soon.
Despite looking externally similar, #17 and up heads are very different inside. Open up the large coolant plugs on the intake side of the head and look inside. The deck is much beefier on the later heads. As far as I know, the om603 was the first aluminum head turbo diesel on the market from any manufacturer. Mercedes made some mistakes on this design which they later corrected.
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Shall I take it to a professional and ask them to check with flourescent dye? They probably will laugh their heads off. They all pressure test it with air. What I have is a #14. It is not what I wish to have, it is a matter of doing the best with what I have. Any crack will show up with air, air will pass thru cracks, i.e. bubbles, no matter how small. I honestly don't think temperature or torque would affect the test redult one way or the other. The professional don't torque it.