Onan genset, overheat after coolant change
I just did a cooling system drain, flush and refill on my 10KW Onan generator. I followed the procedure in the manual precisely. I was also able to get all of the required 6 guarts of new coolant ba...
Forum Discussion
From a old post by Caymann on how to change that his manual did not include. If you did not do it this way you may need to drain and start over. I also read where you need to refill slowly or the air will not come out. This is a Onan 10kW with Isuzu 3LD1 engine.
If you open that cover, you will see a 13lbs rated pressure cap.
There are three tubes attached underneath the cap.
The top one goes to overflow tank.
The middle one is of interest. It goes straight to the top of the
engine where the water pump and thermostat is located.
The bottom tube is where all the coolant goes.
Raise this assembly of tubes and pressure cap, above the engine.
Use a funnel to pour coolant into the bottom tube.
As coolant fills up, air is expelled through the second tube.
At some point you will see the coolant coming out through the second tube and third tube together. Cover this with a new pressure cap (preferably).
Now lower this tube assembly below the bottom of the coolant overflow tank. Any air trapped will now come out the overflow tank.
Assemble it the way you found it.
If you open that cover, you will see a 13lbs rated pressure cap.
There are three tubes attached underneath the cap.
The top one goes to overflow tank.
The middle one is of interest. It goes straight to the top of the
engine where the water pump and thermostat is located.
The bottom tube is where all the coolant goes.
Raise this assembly of tubes and pressure cap, above the engine.
Use a funnel to pour coolant into the bottom tube.
As coolant fills up, air is expelled through the second tube.
At some point you will see the coolant coming out through the second tube and third tube together. Cover this with a new pressure cap (preferably).
Now lower this tube assembly below the bottom of the coolant overflow tank. Any air trapped will now come out the overflow tank.
Assemble it the way you found it.
