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Air Medal or two
Join Date: Jul 2003
Location: cross roads
Posts: 14,123
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Question: Are the rings still free in the grooves?
Next,- notice the scuff marks I can sort of see on the piston skirts. (scoring) In there is probably a lack of lubrication on the bottom and detonation on the top. If the rings are not free to move, this happens if the piston is slowly compressed by the detonation shock waves . But if it is a cast piston, they just break. (as it did)
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D troop 3/5 Air Cav,( Bastard CAV) and 162 Assult Helicopter Co- (Vultures) South of Saigon, U Minh Forest, Delta, and all parts in between Last edited by afterburn 549; 12-10-2023 at 08:46 PM.. |
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12-10-2023, 03:58 PM
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Registered
Join Date: May 2012
Location: ORD
Posts: 359
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The piston looks like the rings butted, due to a lean condition, then broke the lands. The melting happened after that. Additional oil promotes the melting of the piston, which is evident. This engine was driven fairly hard after the rings butted. Loss of power and excessive oil smoke out the exhaust, were tell tail signs. It was driven hard with a problem. At 1500 miles, the problem isn't yours.
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12-12-2023, 01:48 AM
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Registered
Join Date: Oct 2003
Location: Mount Pleasant, South Carolina
Posts: 14,292
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I didn’t read all the responses, but was there too much play between the rings and the lands? Too much play, and the ring chatters in the groove, breaking the lands.
At least that’s what I recall. |
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12-12-2023, 06:35 PM
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Registered
Join Date: Jun 2000
Location: bottom left corner of the world
Posts: 22,805
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I wonder if a Honda engine would fit in there so this doesn't happen again.
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12-12-2023, 10:00 PM
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