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Damn plastic!!!!!!

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I pulled apart a vertical 19 hp IC briggs today.A friend of mine got it so hot it wouldn't crank til it cooled off and then started with a hard tapping but I wouldn't call it a knock.I torn it down to find the rod blue and smeared but the crank was perfect.That's a big break.This model is a 42A707.The "A" engine don't use a dipper because it is a vertical instead it uses a cam driven oil slinger.It's 2 gears ,ine with a paddlewheel to splash the oil.The gear that meshes with the cam is riveted to the holddown fixture.The rivet that holds the gear to the fixture over time ate into the gear centerhole and the cam no longer made contact with this gear because it laid about 25 degrees to its side.Make a long story short....the only plastic piece in the engine FAILED and caused a disaster.Every other part in the engine was absolutely like brand new after 7 years of regular oil changes.Anybody else see this?

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Yes, but not on those twins yet. I did an 18hp i/c that lost a valve seat because it was over heated(nest under the shield). The owner actually paid to have it taken to the machine shop who installed an oversized seat and for me to reassemble it. I got that valve a tad loose grinding it but it ran great anyway, just had a slight tick every now and then.

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