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  #1  
Old 09-10-2021, 06:34 PM
Piper J3's Avatar
Piper J3 Piper J3 is offline
 
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Location: Hinckley, Ohio
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Default Coolant Loss…

I notice a slight decline in coolant level in the overflow tank – maybe 1/16” to 1/8” change in level over 20 hours operation. I have removed cowling and looked for leak and found none. At end of flight coolant level is at fill line and when engine cools level is 1/16” to 1/8” lower.

I’d like to know if this is common and if other planes ae experiencing the same coolant loss.
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  #2  
Old 09-10-2021, 06:45 PM
DHeal DHeal is offline
 
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Location: Windsor, California
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Default

Sounds normal to me -- the coolant level in the overflow tank will vary a bit depending on the temperature of the coolant. I would expect some slight loss of coolant over time due to evaporation and tank venting.
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  #3  
Old 09-10-2021, 08:36 PM
NinerBikes NinerBikes is offline
 
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Next time you have the cowling off, on the bottom, if the leak continues, check the weep hole on the bottom of the water pump for coolant residue, or very slow dripping.

If it's dribbling, or there is residue there, time for a new water pump.

Some other ideas...https://pointsforpilots.blogspot.com...12-engine.html
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Last edited by NinerBikes : 09-10-2021 at 08:42 PM.
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  #4  
Old 09-10-2021, 09:23 PM
Charlie12 Charlie12 is offline
 
Join Date: Oct 2014
Location: Port Orange FL
Posts: 52
Default coolant loss

My overflow tank level creeps down roughly 1/4 inch between annual inspections. I have checked carefully for leaks and have never found any.
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  #5  
Old 09-10-2021, 09:35 PM
RFSchaller RFSchaller is offline
 
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Location: Phoenix, AZ
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Mine uses about that much coolant too.
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  #6  
Old 09-10-2021, 11:48 PM
DHeal DHeal is offline
 
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Location: Windsor, California
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Quote:
Originally Posted by NinerBikes View Post
Next time you have the cowling off, on the bottom, if the leak continues, check the weep hole on the bottom of the water pump for coolant residue, or very slow dripping.

If it's dribbling, or there is residue there, time for a new water pump.

[/url]
Not necessarily true. Some pump leakage is permitted by ROTAX -- see Paragraph 1.5: https://legacy.rotaxowner.com/si_tb_...o/si912001.pdf
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