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Old 11-07-2010, 07:02 AM   #29
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Originally Posted by hardy1000 View Post
BCS430,

I had the same problem because I filled the radiator first and then the overflow tank which the manual says to do the oppoisite so I had an air bubble also. Make sure the overflow tank is filled up to the line then with the radiator cap off keep starting the generator and checking the tank level. It took me about 5 starts to get the bubbles out and adding coolant to the correct level between starts and then it worked. Hang in there it does get frustrating.
Strange, my manual states to do the opposite. fill the Radiator first (via the fill tube) and then start the generator with cap off and then add more coolant if necessary. The final step is to fill the overflow tank.

Im wondering how filling the overflow tank first to the cold line and then the radiator would not create an air lock? wouldnt filling the overflow tank first just cause the fluid to run down the overflow tube into the fill tube?
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Old 11-07-2010, 07:32 AM   #30
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Originally Posted by bcs430 View Post
Strange, my manual states to do the opposite. fill the Radiator first (via the fill tube) and then start the generator with cap off and then add more coolant if necessary. The final step is to fill the overflow tank.

Im wondering how filling the overflow tank first to the cold line and then the radiator would not create an air lock? wouldnt filling the overflow tank first just cause the fluid to run down the overflow tube into the fill tube?
My mistake, you are correct, I guess I am a bit dislexsic before coffee. I just wanted to share with you that you are not alone with this problem I just kept starting and filling and it finally ran. Sorry for the confusion I will have more coffee now.
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Old 11-07-2010, 07:51 AM   #31
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I don't know if my procedure is best or if I have just been lucky, but I have changed the coolant in several Onan diesels without any problems. After I drain the coolant I use a funnel in the radiator cap opening and pour in about 4 onces and wait a minute then pour in four more ounces. I do that until the coolant reaches near the top of the rubber tube (radiator cap). It takes several minutes, but I have never had air bubble shut down the generator.

After filling I run it a couple of minutes with the radiator cap off and then install the cap and let it continue running several minutes to warm up. Then I let it cool an hour and remove the radiator cap, top it up, put the cap back on, and pour some coolant in the overflow bottle.

After I run it under load to operating temperature and let it cool down I recheck the coolant level. It has always been right under the radiator cap and the overflow is still at the correct level, indicating there were no air bubbles that surfaced.
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Old 11-07-2010, 07:58 AM   #32
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no worries. I just looked at my manual and the coolant capacity is 6.6 quarts which is more than 1.5 gallons. Right now I can barely get just over 3/4 of a gallon in there without it overflowing past the fill line. Something is definitely not right and there's got to be an air bubble in there somewhere.
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Old 11-07-2010, 08:07 AM   #33
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I just did this 2 days ago, My first time. THe manual seems a little fague on how to do it. I didn't have the filler cap all the way out and it wouldn;t take much fluid
then I called Onan and they said pull it out about 12 inches and it will be hard to pull out. well its more like 8 inches but I was able to use the 50/50 mix and put in just shy of a gallon. Book says to do this every 2 years. the drain plug is on the bottom and there is an arrow I think but it say drain plug coolant. Put a 5 gallon bucket under the gen but had a problem getting it out without spilling

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Old 11-07-2010, 08:15 AM   #34
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CHANGING COOLANT
Refer to Table 3 for scheduled maintenance. The
engine cooling system is filled with a 50/50 mixture
of ethylene glycol anti-freeze and water when the
genset leaves the factory, which is suitable for temperatures
down to -34
F (-37 C).
Replace the coolant every two years. Use ethylene
or propylene glycol anti-freeze solution that contains
a rust and corrosion inhibitor.
The anti-freeze
should not contain a stop-leak additive.

The water used for engine coolant should be clean,
low in minerals, and free of corrosive chemicals.
Use distilled water if available. The cooling system
has a 4.2 quart (4 l) capacity.

Refilling the Cooling System
Fill the recovery tank with coolant mixture to the
COLD mark.
Secure the system drain cap. Fill the cooling system
with coolant mixture through the pressure cap/fill
opening. Pull the hose connected to the pressure
cap assembly out as far as it will go. When coolant
fills up to the fill opening, start and operate the genset
for a few minutes and shut it down. (It is recommended
that the air conditioners or other large loads
be turned on so that the genset will operate under
load, causing the engine to run faster and expel
trapped air.) Add more coolant if necessary and secure
the pressure cap.
Coolant Level Check
Check coolant level in the recovery tank (Figure 10)
before the first startup of each day and fill to the
COLD mark if necessary.

Here is what I have in my manual

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Old 11-07-2010, 08:38 AM   #35
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Quote:
Originally Posted by N6CUS View Post
CHANGING COOLANT
Refer to Table 3 for scheduled maintenance. The
engine cooling system is filled with a 50/50 mixture
of ethylene glycol anti-freeze and water when the
genset leaves the factory, which is suitable for temperatures
down to -34
F (-37 C).
Replace the coolant every two years. Use ethylene
or propylene glycol anti-freeze solution that contains
a rust and corrosion inhibitor.
The anti-freeze
should not contain a stop-leak additive.

The water used for engine coolant should be clean,
low in minerals, and free of corrosive chemicals.
Use distilled water if available. The cooling system
has a 4.2 quart (4 l) capacity.

Refilling the Cooling System
Fill the recovery tank with coolant mixture to the
COLD mark.
Secure the system drain cap. Fill the cooling system
with coolant mixture through the pressure cap/fill
opening. Pull the hose connected to the pressure
cap assembly out as far as it will go. When coolant
fills up to the fill opening, start and operate the genset
for a few minutes and shut it down. (It is recommended
that the air conditioners or other large loads
be turned on so that the genset will operate under
load, causing the engine to run faster and expel
trapped air.) Add more coolant if necessary and secure
the pressure cap.
Coolant Level Check
Check coolant level in the recovery tank (Figure 10)
before the first startup of each day and fill to the
COLD mark if necessary.

Here is what I have in my manual

I have a CMQD 10000 model HDKCC-A. My instructions state to fill coolant fill tube first, recovery tank second. I've pulled the tube up and out as far as it will go. The issue is if you fill all the way to just below the fill line with the tube out and up, you have to start the generator with the fill tube in that position otherwise coolant will overflow and go into the vent tube and create even more air bubbles (if you bring the fill tube back to its original position).
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