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Piston slap when warm? 700 1991

Hi everyone, happy holidays!

I was just wondering if anyone has experienced this before: Sometimes my B230FT makes a piston slap noise when it is warm. It has some 'piston slap' when it is cold, but for the most part it goes away once the engine has warmed up. ALTHOUGH, sometimes when I step out of the car when the engine is running and warm I can make out a slight piston slap like noise. This puzzles my Volvo mechanic as well as me. The engine was totally rebuilt about 8-9K km ago. Before the rebuild it had what I would call severe piston slap that was still quite loud even when the engine was warm. I am hoping that my Volvo's engine is not trying to go back to the way it was. The only internal parts that were not replaced during the rebuild were the crankshaft and the connecting rods (13mm), those five parts did not show any wear. Oh, and just so you know, the valves were adjusted after the rebuild and the oil pressure was tested. Anyway, I'm just wondering if I should be concerned about this occasional 'piston slap' when the engine is warm or if I should just forget about it? The engine has been running on Amsoil 10W30 for the last 1K km or so. Thanks in advance for your input.
--
Chris. Halifax N.S. '91 745Ti, 268K km.






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