Question about Yamaha 12V Air Pump
The damage that can result from overheating an engine would be piston seizure. Without the cooling water circulating around the outsides of the cylinders to dissipate the heat from combustion, the piston temperature rises higher and higher. As the piston(s) get hotter, they expand. Being aluminum, they expand more than the liner of the cylinder does, and eventually expand to a size bigger than the cylinder. That is when the seizure happens.
At this point, you need to do a compression test on all 4 cylinders. You should have at least 150 psi on each cylinder. Anything lower than that is indicative of a problem.
Posted on Sep 23, 2009
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Posted on Jan 02, 2017
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