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Old 05-05-2016, 12:02 PM   #11
Mini-Skoolie
 
Join Date: Sep 2015
Location: Albuquerque, NM
Posts: 32
Year: 1998
Coachwork: Blue Bird
Chassis: TC2000 RE
Engine: Cummins 8.3; Allison 3060R
Rated Cap: 66 passenger
Hi, me again... Well, I think I might actually have a leak, as I've had to add another gallon of coolant to the reservoir. I don't see any obvious leaks, and it's likely about 1 gallon of coolant needing to be added per 1k miles or so. Any ideas or clever ways to find the leak? Is it advisable to use some of the coolant dyes on the market to help? How about some of the stuff added to the system to help seal any minor leaks? I don't want to make the situation worse, but I figured maybe some of this might help...
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Old 05-05-2016, 12:08 PM   #12
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Join Date: May 2010
Location: Montana
Posts: 1,615
Year: 1995
Coachwork: Blue Bird
Chassis: All-American R/E
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If you havent yet, get an oil sample done. This will tell you if you are leaking coolant into the oil or not. Blackstone Labs is where to get that done, $28.
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Old 05-05-2016, 12:22 PM   #13
Mini-Skoolie
 
Join Date: Sep 2015
Location: Albuquerque, NM
Posts: 32
Year: 1998
Coachwork: Blue Bird
Chassis: TC2000 RE
Engine: Cummins 8.3; Allison 3060R
Rated Cap: 66 passenger
Thanks. I just changed the oil recently, and I was encouraged by the fact that I didn't see any water or anything "non-oil" in the oil. Also, the exhaust doesn't seem to ever be whitish, which I was thinking was a good sign. I've not smelled coolant either out the exhaust. Do these make it sound more like leak in the lines somewhere, rather than in the block, etc?
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Old 05-05-2016, 12:38 PM   #14
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Location: Willamina, Oregon
Posts: 4,957
Year: 1997
Coachwork: Bluebird
Chassis: TC 1000
Engine: 5.9
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If someone worked on your bus heaters and got a bunch of air trapped in the lines it might be working it's way out over time. Just a guess.
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Old 05-05-2016, 12:38 PM   #15
Bus Crazy
 
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Join Date: May 2010
Location: Montana
Posts: 1,615
Year: 1995
Coachwork: Blue Bird
Chassis: All-American R/E
Engine: 8.3 Cummins
Rated Cap: 72
Those are all good signs. Nothing around heaters, front heaters? Its got to be going somewhere if you are using that much. Unless someone did some work on it and its working out air bubbles still.
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Old 05-05-2016, 12:53 PM   #16
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Join Date: May 2014
Location: West Ohio
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Year: 1984
Coachwork: Bluebird
Chassis: International 1753
Engine: 6.9 International
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Did you pressure test it?
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Old 05-05-2016, 12:58 PM   #17
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Join Date: Oct 2015
Location: Spring Valley AZ
Posts: 784
Year: 2000
Coachwork: Bluebird
Engine: 5.9 Cummins
Rated Cap: 2 elderly children, 1 cat
I just fixed a coolant leak, the top rad. hose was leaking at the rad. Replaced to hose and all is Ok....for now. After I added makeup coolant I did bleed the system via the factory bleed hose at the rad. It's a very small tubing with a brass shut off valve on it. Warm engine, all heater valves open, open the bleed valve until coolant appears. Close the bleed valve.
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Old 05-05-2016, 01:53 PM   #18
Mini-Skoolie
 
Join Date: Sep 2015
Location: Albuquerque, NM
Posts: 32
Year: 1998
Coachwork: Blue Bird
Chassis: TC2000 RE
Engine: Cummins 8.3; Allison 3060R
Rated Cap: 66 passenger
does anyone know where I can find procedure to replace the coolant/filter, for Blue Bird RE Cummins 8.3L? I had been planning to do this already, but am not sure of how to do the bleeding, and where the bleed valves are, etc? Thx!
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