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08-23-2015, 04:55 PM | #1 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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The Mystery of the Disappearing Coolant
I keep refilling the coolant overflow bottle on my RX3, but it never stays full. How is the coolant disappearing?
All motorcycle engines with water cooling have an small hole near the water pump which will ooze coolant if the water seal fails. I have repeatedly examined this inspection hole on the RX3 water pump, and it is not leaking coolant. Therefore, I must believe the water seal is in good condition. I have also checked all the hoses and connections between the engine and the radiators. I have not discovered any leaks. How is the coolant disappearing? I certainly think any air voids in the coolant system should have been filled by now. I have recorded over 8,000 miles on the odometer of my RX3 motorcycle.
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Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894 |
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08-23-2015, 05:03 PM | #2 |
Join Date: Sep 2014
Location: Arvada, CO
Posts: 1,004
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8000 miles ... you are my hero
As to the coolant ... could it be leaking inside the engine somehow? How's the oil level, smell and color?
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Red 5 standing by! 2015 CSC red RX3 with 19" front wheel, Shinko 804/805, skid plate, tall seat, 13T/45T sprockets, progressive shock, Winyoochanok windshield, GENSSI LED headlight, SW-Motech tankbag, Shorai Lithium battery 2014 Ural Patrol |
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08-23-2015, 05:22 PM | #3 | |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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Quote:
The coolant disappears slowly, so I don't suspect faulty gaskets. At first, I thought the left radiator had an air void from the factory, which needed to be refilled. However, after refilling the coolant overflow bottle many times, I now suspect Adjuster is correct.
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Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894 |
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08-23-2015, 05:14 PM | #4 |
Join Date: Dec 2014
Location: Deerfield Beach FL
Posts: 1,410
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How much and how often are you needing to add coolant? Is the overflow bottle vented, could it be evaporation that could happen very quickly with the heated coolant. Is it possible to temporarily block off the overflow bottle so you have a completely sealed system. Then ride for a week as usual and see if you lose any coolant. Just an idea, don't know if it will work.
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08-23-2015, 05:33 PM | #5 | |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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Quote:
I could plug the tube to the coolant overflow bottle, but I don't think that's a good idea. The cooling system is working superbly, and my engine never overheats. Every time I remove the radiator cap, the coolant level is full to the top of the radiator. Therefore, I suspect evaporation is the problem. I am willing to accept slow evaporation from the coolant overflow bottle as a minor quirk of the Zongshen RX3.
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Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894 |
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08-23-2015, 05:32 PM | #6 |
Join Date: Sep 2014
Location: Arvada, CO
Posts: 1,004
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If it's evaporating ... is your coolant getting more concentrated? or do you think the coolant evaporates along with the water?
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Red 5 standing by! 2015 CSC red RX3 with 19" front wheel, Shinko 804/805, skid plate, tall seat, 13T/45T sprockets, progressive shock, Winyoochanok windshield, GENSSI LED headlight, SW-Motech tankbag, Shorai Lithium battery 2014 Ural Patrol |
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08-23-2015, 05:48 PM | #7 | |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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Quote:
http://www.researchgate.net/publicat...liquid_mixture Also, the suspected evaporation occurs very slowly, over a span of several weeks. Therefore, I don't think the coolant in the overflow bottle is becoming concentrated.
__________________
Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894 |
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08-23-2015, 05:59 PM | #8 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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According to the following thread, if the coolant overflow bottle does not hold pressure, the coolant will evaporate.
http://www.bobistheoilguy.com/forums...Number=1600370 I seriously doubt the coolant overflow bottle of my RX3 motorcycle can retain pressure. If I tighten the cap too much, it releases. Did I get a bad coolant overflow bottle? Does the cap tighten securely for others?
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Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894 |
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08-23-2015, 06:13 PM | #9 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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The following threads also support the theory that an unpressurized, coolant overflow bottle will allow coolant to evaporate. Is my coolant overflow bottle defective, or do all the RX3 bottle caps refuse to tighten securely?
http://www.jk-forum.com/forums/stock...normal-137010/ http://forums.nasioc.com/forums/show....php?t=1467927 http://honda-tech.com/tech-misc-15/n...-tank-2880706/ http://www.subaruoutback.org/forums/...ed-normal.html
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Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894 |
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08-23-2015, 07:54 PM | #10 |
Join Date: Sep 2014
Location: Arvada, CO
Posts: 1,004
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I thought overflow caps weren't supposed to seal well. They need to vent air in and out as the overflow level rises and falls with engine temperature. However, the radiator cap must seal to force expansion into the overflow bottle and suck fluid back in. And the overflow level must stay above the fill tube to prevent air from being sucked in from there.
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Red 5 standing by! 2015 CSC red RX3 with 19" front wheel, Shinko 804/805, skid plate, tall seat, 13T/45T sprockets, progressive shock, Winyoochanok windshield, GENSSI LED headlight, SW-Motech tankbag, Shorai Lithium battery 2014 Ural Patrol |
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08-23-2015, 08:42 PM | #11 |
Join Date: Jan 2015
Location: Northern Virginia
Posts: 144
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I also noticed my coolant bottle was low a week or so ago, and filled it to the "top" mark, and it also seems to be gradually dropping. Like Spud I am beginning to wonder where the coolant is going. I don't accept the "evaporation" theory, since none of my other bikes (or cars) with non-pressurized expansion bottles loose coolant at anything like this rate.
I am not seeing (or smelling) any sign of a bad hose connection or other "outside" leak. One possibility is that there is a head gasket leak allowing coolant to enter the cylinder, but this sometimes results in hard starting and other running problems, which I am not experiencing. My plan is to let the coolant drop in the bottle, and then to start checking the radiator cap (engine cold of course) to see if the coolant level there also begins to drop. If it does, further diagnosis may be in order. |
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08-23-2015, 08:57 PM | #12 |
Join Date: May 2015
Location: Wimberley Texas
Posts: 193
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My bike also experiences a small amount of coolant loss over time.
I suspect an inherent design and not a problem because there appears to be a few bikes with this going on. |
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08-24-2015, 12:08 AM | #13 | |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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Quote:
__________________
Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894 |
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08-24-2015, 12:28 AM | #14 | |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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Quote:
Please remember, I have now recorded about 8,250 miles on the odometer of my RX3. Therefore, I had ridden enough miles to fill the coolant in the left radiator. The coolant level in my radiators has now stabilized at full. Nevertheless, the coolant level in the overflow bottle continues to fall, but at a much reduced rate.
__________________
Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894 |
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08-24-2015, 10:57 AM | #15 |
Join Date: Jan 2015
Location: England
Posts: 382
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To me it seems counterintuitive to fill up your over flow bottle.
I'm not convinced that it can "top up" the coolant system. If the bike were to over heat and blow, I want super hot coolant in the bottle not on me so I leave mine empty so there's plenty of room But that's just me |
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