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89 740 engine interchange? 700

posted by  CW on  Sat Oct 2 17:24 CST 2004
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last visit: Tue Feb 5 13:37 CST 2008
[RELATED]

Hi Phil,

I don't mean to question your mechanical knowledge, but are you sure the '89 has rod knock? B230s are known for "piston slap" and it can get pretty noisy, especially when cold. I thought my '91 740 non-turbo had rod knock shortly after I bought it (about 352K km on it). The engine would knock (idling, accelerating) in the morning until it was at running temp. I asked my Volvo mechanic about it, he said that it's probably piston slap and that since the engine seemed find otherwise to just drive it and see if that changes. So that's what I did and it hasn't changed in almost 30K km > ~18K mi (almost 381K km now). So I guess it's piston slap. Wierd. Maybe you have totally different symptoms though. Just thought I might tell you my experience :) Oh, I did an oil change with 10W30 soon after I bought the car and 5K km later I switched it to Shell Rotella T 15W40. I've been using that in it since. Seems to really like that oil.
--
Chris. Halifax N.S. '91 745Ti, 290K km and '91 745 NA, 380K km.






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