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#1
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What's that sound?
1978 300D has moderate knocking sound only when reved up. Same at high idle, at speed up-hill, whenever - only at higher RPMs. I've only encountered a bad rod noise that would pretty much show up all the time, so this one kinda has me wondering. Car is high mileage, so I wouldn't be surprised at a rod problem, but the engine has clearly been taken care of since there is only a whisper of blow-by. Car has normal power for a non-turbo of this vintage.
??
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Erlend 1981 300D 202K daily driver |
#2
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Failing vacuum pump can knock. Time for a stethoscope. Bad injector can cause knocking. Look at Konstan's thread for long drawn out knock diagnosis.
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13 |
#3
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http://www.peachparts.com/shopforum/video-forum/
Whunter just posted some very informative videos here. They might help you get a better idea of whats going on. |
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