I have a GM90 6/1 with 20hrs > or < on it and changed the oil for the first time today. The engine has been run from waaaaay too fast( I figured this out AFTER figuring pulley sizes and hooking up a gen head) to teh correct 750 RPM with a VERY heavy load. The engine has been run on diesel, waste motor oil and bio-diesel (homemade of coarse
). I was disapointed that all of the oil will not drain from the sump. I had to mop it out with paper towels. But on the bright side there was no grit or metal in the sump. I was VERY happy with that. While in the process of changing the oil I added a short nipple and ball valve to make changing the oil a lot less messy the next time. The oil was dark but not as dark as I had expected. AS told by Mike (the man I bought the engine from) I had the cheapest 30 wt oil I could find in the crank case (Rotella next time). As for cooling I have an Apollo thermostat (ball valve) to restrict the water flow with untill the engine gets up to temp and a salvaged 40 gal. water heater tank.
The engine is pulling a 5250 watt DeVilbiss piece o junk gen head (it was free). The head is making noise so it will be replaced before long. It will start a 3/4 HP sub. pump that is 300' down
. Very happy with that. It runs anything in the shop I ask it to however it does not like to start the radial arm saw (the gen head). The motor will do any thing but the 4500 watt water heater element. Think I may drop to one 2500 wayy element and run it first for the hot water I need.
How are you guys keeping up with the hours. Writing them down? Some sort of clock? just wanted to know. Sorry for the loooong post.
Thanks for all of your input.
Johnny Williams