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Old 05-20-2001, 09:43 PM
RunningTooHot's Avatar
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I was researching these cars, and came across an article that stated the 1984 & 1985 turbodiesel engines have an alloy cylinder head (versus iron) and that they don’t need valve adjustments. Plus, they have a serpentine belt drive for the accessories – is this a preferable setup compared to the earlier conventional V-belt setups?

Or is this information even correct??

Thanks again!
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Old 05-20-2001, 09:53 PM
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By the way, here is a link to that article:

I notice that he refers to the 1984 & up diesels as a “601, 602, & 603” engine family – is this guy just off on the years they were made? I know that the diesel engines in the 124 cars are different than the 123 &126 cars.
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Old 05-20-2001, 10:06 PM
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I think this guy is off on his model years. I'm no expert, but I've always been under the impression that the 617 engines all have iron heads. Also, I paid my independent shop to adjust my valves, which they recommend every 15,000 miles.
Bob Roe
Lehigh Valley PA USA
73 Olds 88, 72 MB 280SE, 78 Datsun 280Z, 71 T-Bird, 72 Olds 88, 83 Nissan Sentra, 85 Sentra, 73 230.6, 91 Integra, 83 300SD, 91 Volvo 940GLE wagon, 84 300SD, 95 Subaru Legacy L wagon, 02 Mountaineer, 91 300TE, 08 Murano, 2007 R320CDI 4Matic 52K, some Hyundai, 2008 BMW 535xi wagon all gone... currently
2007 Honda Odyssey Touring, 2011 Honda Odyssey Touring
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