We have a four cylinder Cummins / Onan 20kw gen set. The gen set is down low in the forward area. Recently a leak developed allowing water
into the compartment. The engine
was not running and no attempt to start it has been made as we feared water
was in a cylinder. This was supported by the presence of a small amount of water in the intake area. Apparently water entered the engine
and filled it to the top of the dipstick hole. At the same time (long story) the anti siphon valve failed and the aqua lift muffler
filled and apparently backed into the engine and may have entered into at least one cylinder. The sea cock was open and quite a bit of water entered. The water was discovered and was in the engine for about six hours. We are not certain if water has entered any cylinder.
We removed several quarts of water with an oil change
vacuum pump, along with the old contaminated engine oil
. We changed the oil
, removed the glow plugs and the injectors, used plenty Marvel Mystery Oil down each injector hole. After that we attempted to turn it over by hand using the nut on the front of the engine, without success.
We are thinking now that we may be dealing with a hydrostatic lock. What confuses us is how to remove the water or make sure none is in any cylinder. We are wondering if this will require us to remove the head
or is there another way to remove the water for certain, if it is present? We also have been told that the lock could also be caused by the muffler
itself if it is over full.