Doug&Deb Posted January 4, 2023 Report Posted January 4, 2023 I’m usually on the car side of the forum since I have a 52 Coronet. I’m rebuilding my first engine which according to the number is from a 58 truck. I don’t have a manual and I’m not sure if there are any differences from the 52 manual. My question concerns piston rings. I’m wondering about the 4th ring that has the u-shaped profile. The other rings have a gap between.010-.012. The 4th ring is a much smaller gap. The 52 manual calls for.007-.015 on all rings. Before I start filing could someone please check on what the 58 truck manual says. Thanks in advance. Quote
Los_Control Posted January 4, 2023 Report Posted January 4, 2023 (edited) Ring gap is very important in high performance engines. With High rpm & heat, the rings expand, closes the gap & breaks the ring landings on the piston. Just saying in that case, it is not the piston that failed, it is the too tight ring gap that broke the piston. I have no idea how critical this is on our 95 hp flathead engines .....I would want to file the rings to specs if up to me. My 1958 Motors auto repair manual shows .010 for both compression & oil rings. Edited January 4, 2023 by Los_Control Quote
Los_Control Posted January 4, 2023 Report Posted January 4, 2023 You might be interested in this new "mini series " of engine rebuilding. Tony thinks it may be 6-8 videos just for noobies like me wanting to open up & rebuild a engine. We may get something from it... Quote
Doug&Deb Posted January 4, 2023 Author Report Posted January 4, 2023 Thanks! I’ll check it out. Quote
9 foot box Posted January 5, 2023 Report Posted January 5, 2023 Here are a few pages from my 1957 K series manual. If they are legible. Rick D. Quote
Doug&Deb Posted January 5, 2023 Author Report Posted January 5, 2023 Thanks Rick! That’s what I needed. Quote
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