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The easiest answer is when it fails a compression test. Buy a compression tester (farily cheap), and test each cylinder. If one single cylinder is below 120 psi, or if one cylinder reads 15% less pressure than the cylinder with the highest pressure, your engine should be torn down and checked. The problem might only be in the heads, but it's still time for some serious work.
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∙ 15y ago
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Will sugar put into the engine ruin the engine?
Yes ... it will need to be torn down and rebuilt.
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Jasper
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unless you can build a engine you need to take it to a mech. or replace the engine with a rebuilt one.
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