I put too much oil in my generator

sae 30 I use GTX

bad seal or loose flange bolts

1. Heat dissipation, cooling and clogging of the lubrication system cause the diesel engine to overheat.

Blockage of radiator or pipeline: once the radiator and pipeline are blocked, the cooling water cannot circulate and the diesel generator will overheat.

Exhaust pipe blockage:When the exhaust pipe is blocked, when the diesel generator is running, the exhaust gas is not discharged smoothly, and some of the exhaust gas remains in the cylinder. When the next intake stroke is intake, there are more in the cylinder. Exhaust gas, fresh oil and gas mixture can not fully come in. When the spark plug is ignited, the flame propagates and burns slowly, and then burning time is long, forming a post-combustion. Parts that are in contact with gas, because of the long burning time, can not release heat, thus causing overheating, at the same time, due to the unsmooth exhaust gas emissions, the exhaust gas temperature rises significantly when exhausting, and the thermal load of the entire diesel generator increases, causing the generator to appear overheat.

Oil filter plugging: Under normal conditions, the oil of the diesel generator enters the diesel engine through the oil filter. Once the oil filter is blocked, the oil enters the lubrication points of the diesel engine only through the bypass passage. In this way, since the oil is not filtered, it is easy to bloc the oil pipeline, causing poor lubrication, the oil pipeline is blocked, and the heat generated by the friction coupler can not dissipated, causing the generator to overheat.

Oil screen plugging: The oil filter is placed at the inlet of the oil absorber in the oil sump to remove foam and prevent large slag from entering the oil pump. Once the oil filter network is blocked, the supply of lubricating oil to the diesel generator is interrupted, which will cause dry friction of the friction coupler of the diesel generator, which will cause the generator to overheat.

2. The cooling system and the lubrication oil system leak, causing the diesel engine to overheat.

Leakage of the radiator or pipeline: The radiator or pipeline leaks. Because the water storage capacity of the diesel tank is limited, the generator will overheat.

Oil pan or oil pump oil leakage: The oil pan or oil pump oil leakage is mostly caused by loose oil plug or gasket damage. The consequence of the oil sump or oil sump leakage is that the diesel generator oil supply is reduced or interrupted. Since the diesel generator reduces the cooling effect of the oil, the heat of each friction pair of the diesel generator cannot be transmitted, so that the generator is overheated.
More information at this article: https://www.dieselgeneratortech.com/diesel-generators/How-to-Deal-with-Diesel-Generator-Overheating-Problem.html

the only thing i can suggest put your pressure washer on level surface and start fill the oil when gets to the right level the oil start coming out

Empty the Oil / Crankcase - You put too much oil in it - After you do this. Fill up the oil to the correct level - Pull the spark plug and clean / dry it and put it back in - It will start - I had the same problem

If at your place the average annual temprature is above 30degree celcius than you should use SAE 10W40 And if the average temp. is around or below 20degree annualy use SAE 10W30

If you could not start in spite of oil and gas change, checked gas supply, spark plug, ignition cables and coils (magnetos) and so on whitout success, then try this:
Your generator has a low oil level protection, which stops the ignition of the motor.
After "a couple of years" sitting without or with old oil, the level switch may have got lazy or stuck down.
If your oil level seems to be good, while measured, find the oil switch and try to shorten or disconnect it.
If you succeed in running the generator change or repair the oil switch.

I hope that this will be helpful, because I don't have your device in front of me, but some people rank such an answer with 2 thumbs, which means useless. Better dont rank.

you should have a drain plug at the side and bottom of the motor crank case its a small plug with a square head how old is your generator if new put 10w30 oil if old put sae30w if really bad add some lucas oil treatment also now a 9 h.p. should take less then 2 quarts

There are two 14mm bolts on both sides (lower) of the motor. Unscrew one or both and drain the oil....Replace with sae 30 or 10w30 oil and should take almost a quart. (Put the bolts back in and tork slightly.) Check oil level.

Unless you're in very cold locations use SAE 5W30 regular motor oil.