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#1
06-19-2004, 12:45 AM
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PPI for 350
Is it worth requesting an extensive PPI for a 603.97? I'm thinking of something like pulling the prechambers to measure piston height at TDC. Should be a good indicator of bent rods, right?
I'm not thinking of a particular 350. I haven't seen one for sale anywhere near me  Sixto 95 S420 87 300SDL 
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#2
06-19-2004, 12:55 AM
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sixto,
A compression test involving dry and wet tests as well as a leakdown test will tell you most of what you need to know. Unless the rods bent as the engine was shut down at the PPI site, there will be a significant loss of compression in one or more cylinders if there is one or more bent rods. A good compression test is a great check of any automobile engine before buying. Means more than the unquantified blow by checks and most other checks with regard to the actual health of the machine. There have been debates on what it actually means, like where precisely the problem might be and what you need to do to fix it. But when you are buying a car, any problem that requires the head to come off is one that should give pause to actually buying the car. Of course there are circumstances and at least with a compression assessment you know the head is coming off or not. Good luck, Jim
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Own: 1986 Euro 190E 2.3-16 (291,000 miles), 1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000, 1988 300E 5-speed 252,000 miles, 1983 240D 4-speed, purchased w/136,000, now with 222,000 miles. 2009 ML320CDI Bluetec, 89,000 miles Owned: 1971 220D (250,000 miles plus, sold to father-in-law), 1975 240D (245,000 miles - died of body rot), 1991 350SD (176,560 miles, weakest Benz I have owned), 1999 C230 Sport (45,400 miles), 1982 240D (321,000 miles, put to sleep)
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