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Tucsonchris
Joined: 26 Oct 2007
Posts: 12
Location: Tucson, Arizona
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 Posted: Wed Oct 06, 2010 12:55 pm Post subject: coolant boilover problem |
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I have just 30 minutes of runtime on my 912s. Did some taxiing yesterday and when I shut down I heard a big hissing in front. Got out and saw coolant pouring out the bottom--looked inside the inspection door and saw coolant screaming out from under the pressure cap (the metal one). This continued until the engine cooled down.
My CHT's at the time were around 165. All other engine readings were normal. All hose fittings are secure. How could the pressure build so high as to bust open the pressure valve on the cap?
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pchristensen10(at)austin.
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| Posted: Wed Oct 06, 2010 1:34 pm Post subject: coolant boilover problem |
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Maybe your cap is not holding the proper pressure. I believe 17 psi
is the proper cap. The previous owner had a 6 psi cap on mine and it
did also boil over.
Pete
On 10/6/2010 3:55 PM, Tucsonchris wrote:
| Quote: |
I have just 30 minutes of runtime on my 912s. Did some taxiing yesterday and when I shut down I heard a big hissing in front. Got out and saw coolant pouring out the bottom--looked inside the inspection door and saw coolant screaming out from under the pressure cap (the metal one). This continued until the engine cooled down.
My CHT's at the time were around 165. All other engine readings were normal. All hose fittings are secure. How could the pressure build so high as to bust open the pressure valve on the cap?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=314957#314957
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Tucsonchris
Joined: 26 Oct 2007
Posts: 12
Location: Tucson, Arizona
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| Posted: Wed Oct 06, 2010 2:21 pm Post subject: Re: coolant boilover problem |
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Interesting possibility. However, my engine is factory new and I have no reason to believe that Rotax installed the wrong cap. I also have a heater core installed in parallel with the plumbing. Can a large air pocket cause the effect? Basically expanding so as to push the fluid to capacity in the overflow bottle and leaving the fluid no where else to go?
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lcfitt(at)sbcglobal.net
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| Posted: Wed Oct 06, 2010 3:42 pm Post subject: coolant boilover problem |
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Is the overflow bottle vented? The reason I ask is that I overfilled once
and the excess came out of the bottle vent.
Lowell
--------------------------------------------------
From: "Tucsonchris" <gallchrisa(at)qwest.net>
Sent: Wednesday, October 06, 2010 3:21 PM
To: <kitfox-list(at)matronics.com>
Subject: Re: coolant boilover problem
| Quote: |
Interesting possibility. However, my engine is factory new and I have no
reason to believe that Rotax installed the wrong cap. I also have a heater
core installed in parallel with the plumbing. Can a large air pocket cause
the effect? Basically expanding so as to push the fluid to capacity in the
overflow bottle and leaving the fluid no where else to go?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=314967#314967
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Wed Oct 06, 2010 7:27 pm Post subject: Re: coolant boilover problem |
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CHT's and water temps are usually within a few degrees. So at 165F you should not have a boil over unless the cap was not screwed on straight or the cap is bad. It can happen. Take the cap off and put it back on. Run the engine again and if it boils over replace the cap.
I take it you are using a 50/50 coolant mix?
An air pocket is not too likely and if you had one to start you would notice a low coolant level when you took the cap off. One thing to check is make sure none of your hoses have a kink. Some hoses depending on the radius bend have a spring inserted so when it bends it doesn't kink.
The other thing on my mind is are you sure the 165F was correct?
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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056 |
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Guy Buchanan
Joined: 16 Jul 2006
Posts: 1204
Location: Ramona, CA
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| Posted: Wed Oct 06, 2010 8:25 pm Post subject: coolant boilover problem |
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On 10/6/2010 3:21 PM, Tucsonchris wrote: | Quote: | | Quote: | I also have a heater core installed in parallel with the plumbing. Can a large air pocket cause the effect? Basically expanding so as to push the fluid to capacity in the overflow bottle and leaving the fluid no where else to go?
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I think you've nailed it.
--
Guy Buchanan Normal Guy Buchanan 2 13 2010-09-24T17:53:00Z 2010-09-24T17:53:00Z 1 30 173 1 1 202 14.00 <![endif]--> false false false false EN-US X-NONE X-NONE <![endif]--> <![endif]--> /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin-top:0in; mso-para-margin-right:0in; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0in; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} <![endif]--> <![endif]--> <![endif]-->
Guy Buchanan
Scoutmaster – Troop 680
760.809.6145
scoutmaster(at)troop680.org (scoutmaster(at)troop680.org)
www.troop680.org
[quote][b]
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Thu Oct 07, 2010 6:11 am Post subject: Re: coolant boilover problem |
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Hi TucsonChris,
I live in Tucson, also and I hanger out at Ryan Airfield. If you need any help give me a call.
Nice catch Guy,
The parallel heater core in the second post is the important part. I'm still not convinced about the air pocket, but I am leaning a whole lot on the flow following the path of least resistance and not running through the cooling system and heads as designed. I'm definitely with Guy and you should route this in series so the coolant is forced to flow the entire coolant path and not pick the least resistant route. Make sure no hoses have too sharp a bend. If they do put a stainless spring in the hose at the bend and that will keep the kinks out. You may then need to setup a bypass for the heater coolant so you can turn it off and on.
Roger lee
574-1080 H
349-7056 C
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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056 |
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Pat Reilly
Joined: 06 Aug 2009
Posts: 345
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| Posted: Thu Oct 07, 2010 7:08 am Post subject: coolant boilover problem |
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TucsonChris, I originally set up my heater routing incorrectly and exactly what guy said happened. I diagagnosed it without the problems you encountered because I wondered about it from the very begining. Just fill her up, run your engine and feel your hoses or pipes for heat to see if you are bypassing the radiator with your heater circuit.
Pat Reilly
Mod 3 582 Rebuilt
Rockford, IL
On Thu, Oct 7, 2010 at 9:11 AM, Roger Lee <ssadiver1(at)yahoo.com (ssadiver1(at)yahoo.com)> wrote:
| Quote: | --> Kitfox-List message posted by: "Roger Lee" <ssadiver1(at)yahoo.com (ssadiver1(at)yahoo.com)>
Hi TucsonChris,
I live in Tucson, also and I hanger out at Ryan Airfield. If you need any help give me a call.
Nice catch Guy,
The parallel heater core in the second post is the important part. I'm still not convinced about the air pocket, but I am leaning a whole lot on the flow following the path of least resistance and not running through the cooling system and heads as designed. I'm definitely with Guy and you should route this in series so the coolant is forced to flow the entire coolant path and not pick the least resistant route. Make sure no hoses have too sharp a bend. If they do put a stainless spring in the hose at the bend and that will keep the kinks out. You may then need to setup a bypass for the heater coolant so you can turn it off and on.
Roger lee
574-1080 H
349-7056 C
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center
520-574-1080
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=315018#315========================
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Pat Reilly
Mod 3 582 Rebuild
Rockford,IL
[quote][b]
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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| Posted: Thu Oct 07, 2010 7:55 am Post subject: coolant boilover problem |
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I had a similar problem when I first got my plane. The original builder put
the overflow tank and the fluid return from the top of the heads on a "T".
That meant that there was no pressure being built up in the cooling system
and it always boiled over. As soon as I saw the plane I found this
abnormality I had a second port installed in the filler on the low pressure
side of the cap for the overflow bottle.
On one other occasion I had the same problem again which was caused by some
kind of faulty sealer that was used when the engine was overhauled. That
problem was fixed double quick and I never had another problem with that
engine.
Noel
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Noel Loveys
Kitfox III-A
Aerocet 1100 Floats |
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