[quote="pburchett"](quoted from post at 18:00:45 02/12/21) I am rebuilding a HF TO-20 for my wife. It was her pappys tractor.
What can anyone tell me about the condition of the engine from these photos.
I am assuming the crankshaft is still in the engine. If you purchase a head gasket and install the head you can do a leak down test. Install the head without the push rods or omit the rocker arms so all the valves are held closed by the valve springs. The pistons are typically positioned two at TDC and two at BDC. The leak down tester outlet is threaded into the spark plug hole and compressed air is introduced the cylinder you wish to test. The inlet of the tester is connected to an air compressor.
There are two pressure gauges on the tester. One gauge is used to set the test pressure and the other gauge reads the air leakage of the cylinder. If you have leakage, listen at the inlet or exhaust port to determine which valve is leaking. Leakage past the piston can sometimes can be hear by listening at the crankcase breather. In my opinion, the leak down test can actually give you more information about engine condition than a compression check.
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