Date registered: Aug 2010
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Hole in #3 Piston 1979 300SD
Hello members, I've recently bought a 1979 300SD that I'm going to fix up with my daughter. Got it for $400, after having been warned that cylinder #3 has no compression.
OK, I think, more than likely it's a stuck or broken valve. Did the valve adjustment, did the marvel mystery oil thing in the cylinder, still no compression.
Decided to pull the head this weekend, and find that the #3 piston has a hole in it. Other 4 cylinders test at about 375, which I understand is acceptable. I'm still interested in getting this car operable, and intend to pull the engine and replace at least number 3.
My question to all of you is, should I go with brand new pistons in all 5 cylinders, or try to install a set of used ones that I found are available from a salvage company and have about 100K on them before the same year 300SD that they came out of got into a wreck? Having never done a piston replacement before, I'm seeking advice on what other MB owners or mechanics would do in this circumstance...
Cost is obviously a factor, but I want to do this the right way, and only once.
Thanks - Wil