Re: Leak down
Yes, by using a leakdown tester, the results shown will give an indication of how well the combustion chamber is sealed without any disassembly.
Normally, you get the engine to operating temperature.
Remove spark plugs.
Rotate crankahsft to get CUT (cylinder under test) at compression TDC.
Install gauge into plug hole, usually thread a hose and atach the manifold.
Whether you have a single-gauge unit or a double-gauge unit, you must supply it with over 100 PSI shop air as read by the first gauge or gauge on the shop air supply.
If there is a regulator, then adjust the reg to read 100 PSI on the tester, otherwise, turn down shop air supply to read 100 PSI being supplied.
Read second gauge, or the only gauge, on the manifold. This indication is the amount of sealing, ex. 100-20 = 80 PSI. or 20% leakage.
Leakage is presented as a percentage. I believe any leakage over 15% is warrantied an emgine rebuild.
Listen for air leaking from the valves at either the carb throat, leaky intake, exhaust pipe, leaky exhaust valve, or the oil fill cap, leaky rings.
When done, clean & recoil air hose, clean tester and store back in tool box, replace spark plugs and reconnect plug wires, and enjoy a cold drink of your choice.
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