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Showing results for tags 'sudden knocks.'.
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So after getting the rear valve replaced in my new 1991 520h find P220G engine and getting it back together... The initial startup with new oil and filter the engine sounded really tight and quiet, component wise. The Engine only has 1250hours on it... Now after running it a few times for no more than 10-15mins and mostly at idle and only a couple of minutes max at full throttle testing out the transaxle I'm noticing a quick knocking noise. The crank case breather is clean, spark plugs gapped correctly, carb set to factory specs and even a bit of motor honey to help quite things down I still hear this noise. It sounds like the rods. But like I said, wasn't there at the initial startup!? The oil pressure light isn't coming on while running. BUT, could the tractor sitting in the fluctuating climates cause a weakening of the oil bypass spring and only show symptoms of being weak after the first real run and heat up of the engine after getting a new valve seat? I hear the knocking during running and especially when shutting it off. It's not crazy rod knock but is more than I'd like to hear from a engine with half the hours of my 1990 520h engine. My 1990 520h P220G has almost 2400hrs on it and sounds great. I was hoping that this engine would sound better than my 1990 and for it's first run it did.
