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Engine Discussion of preventative/corrective maintenance and other technical issues regarding your coach's engine.

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  #1  
Old 10-27-2011
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matthewmccaskey matthewmccaskey is offline
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Default Fluctuating Tempature Gauge

I received expert advice from the WOG about changing the coolant hoses on the Air Compressor on my 93 BB.. When I took one hose off it broke in two pieces.. I flushed the Coolant system and added new pink Diesel Antifreeze that is supposed to mix with any color. But, I now notice that my tempature guage is Fluctuating. It will constantly rise to 195 degress and then fall to 180.. Then it will occasionally fall to 170 and stay for awhile, then start the Fluctuating again. Anyone have an Idea what this may be??
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  #2  
Old 10-27-2011
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Perhaps the thermostat is sticking open.
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  #3  
Old 10-27-2011
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It is likley the fan is switching on and cooling the system down, then switching off..
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  #4  
Old 10-27-2011
jwasnewski jwasnewski is offline
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Fluctuation is normal with the fan override off and the chassis air off. However, one would expect the fluctuation range to be between 187-197 +- a couple degrees. This representing the Alarmstat controlling the fan.

Your gauge may be acting up or you could have a iffy ground most likely between the chassis and engine.
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  #5  
Old 10-28-2011
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Sounds good, I just figured I messed something up when I changed the hoses/coolant.
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  #6  
Old 10-28-2011
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Matthew a couple of questions? What kind or color of antifreeze did you have in the system before you replaced the hoses? Did you drain the complete system and flush it which includes all of the lines running including the lines inside the coach or did you flush just the rear hoses? Did the pink antifreeze you added say on the jug COMPATIBLE WITH ALL ANTIFREEZES? Did the pink stuff have additives of the right level so that the total antifreeze capacity now meets the correct additive levels to guard against corrosion and engine cavitiation?
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  #7  
Old 12-21-2011
drilldoc drilldoc is offline
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Default Fluctuating temperature gauge

Quote:
Originally Posted by matthewmccaskey View Post
I received expert advice from the WOG about changing the coolant hoses on the Air Compressor on my 93 BB.. When I took one hose off it broke in two pieces.. I flushed the Coolant system and added new pink Diesel Antifreeze that is supposed to mix with any color. But, I now notice that my tempature guage is Fluctuating. It will constantly rise to 195 degress and then fall to 180.. Then it will occasionally fall to 170 and stay for awhile, then start the Fluctuating again. Anyone have an Idea what this may be??
Matthew, this is a little late but I'll put in my thoughts on the problem. Have you noticed if your oil pressure and oil temperature also fluctuate when the water temperature changes? I recently experienced that situation with my Series 60. The problem turned out to be a worn oil pressure regulator. There is a compressed spring that wears flat on the bottom side and scores the regulator wall. This wear eventually causes the spring to catch at a scored place on the regulator wall which resulted in my oil pressure falling 6 to 8 psi. When the oil pressure fell, the engine oil and water temps started going up immediately. They each rose about 10 degrees and held there until I hit a road bump or other road caused vibration at which point the spring released from the scored place allowing the oil pressure to go back to normal. The oil and water temps immediately started dropping to their original normal levels.
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  #8  
Old 12-21-2011
rrueckwald rrueckwald is offline
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Quote:
Originally Posted by drilldoc View Post
Matthew, this is a little late but I'll put in my thoughts on the problem. Have you noticed if your oil pressure and oil temperature also fluctuate when the water temperature changes? I recently experienced that situation with my Series 60. The problem turned out to be a worn oil pressure regulator. There is a compressed spring that wears flat on the bottom side and scores the regulator wall. This wear eventually causes the spring to catch at a scored place on the regulator wall which resulted in my oil pressure falling 6 to 8 psi. When the oil pressure fell, the engine oil and water temps started going up immediately. They each rose about 10 degrees and held there until I hit a road bump or other road caused vibration at which point the spring released from the scored place allowing the oil pressure to go back to normal. The oil and water temps immediately started dropping to their original normal levels.
Where is that regulator located?
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  #9  
Old 12-21-2011
drilldoc drilldoc is offline
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Default Fluctuating temperature gauge

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Originally Posted by rrueckwald View Post
Where is that regulator located?

Ron, the oil pressure regulator is located inside the oil pan which has to be removed to access the regulator.
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  #10  
Old 12-21-2011
Clueless Clueless is offline
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Quote:
Originally Posted by drilldoc View Post
Ron, the oil pressure regulator is located inside the oil pan which has to be removed to access the regulator.
No Ron !!!!!!

You can't fix this now, it will need to wait.
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