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40 Deluxe · 06-16-2015, 02:24 PM

Is it normal for a fresh engine to have to 'wear in' before it quits seizing when warmed up?? NO! Something is definitely out of the ordinary here that normal measurements are not picking up. I still think it has to do with the sleeves. Benson's comments about the brief temperature rise upon shutdown (or idling after a good run) may be a clue. If a sleeve is a little too tight and under stress, that little extra expansion from heat might just be enough to pinch the piston until it cools back down. This happens quickly, so the oil film is not wiped off before it stops.

06-16-2015, 02:24 PM	#19
40 Deluxe Senior Member Join Date: May 2010 Location: now Kuna, Idaho Posts: 3,778	Re: Tight engine UPDATE Is it normal for a fresh engine to have to 'wear in' before it quits seizing when warmed up?? NO! Something is definitely out of the ordinary here that normal measurements are not picking up. I still think it has to do with the sleeves. Benson's comments about the brief temperature rise upon shutdown (or idling after a good run) may be a clue. If a sleeve is a little too tight and under stress, that little extra expansion from heat might just be enough to pinch the piston until it cools back down. This happens quickly, so the oil film is not wiped off before it stops.