Thread: diesel350?
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Old 02-12-2003, 01:37 PM
JimSmith JimSmith is offline
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Join Date: Jul 2001
Location: Old Lyme, Connecticut
Posts: 3,596
rdanz,

Yes a compression test will tell the rods have bent, and it gets real obvious as the cylinder wall gets ovalized using this measurement technique. I do not believe it will tell you they are going to bend though. I was responding to the question of what to do if you have one of these cars and have no symptoms, yet. Periodic compression testing might be a path, but a compression test at a shop or the dealership will cost a few bucks, and the end result if the test says it is time to rebuild/replace the engine is no different than if you just wait until it makes itself known by more obvious means. The change in oil consumption and the knocking/rough idle are not subtle. You have to decide if an investment up front to assess the present condition, which is likely ok if the visual/audible and olifactory signals are not present, is of value. This is a personal preference decision, not necessarily one that is technical or likely to bring you a significantly lower rebuild cost.

I hope this helps, and 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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