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RE: Europa-List: Coolant overheating

Subject: RE: Europa-List: Coolant overheating
From: Karl Heindl <kheindl@msn.com>
Date: Sun, 27 Jul 2008 14:51:52

Hi Carl=2C

Thank you for your input=2C I am hoping it is something simple like an airl
ock.
I have a trigear/912S with close to 300 hours=2C with no previous problems 
of this nature. For my last annual I decided
to change coolant (glycol 50/50) and oil=2C and all hoses and fuel lines. I
 had also made changes to improve airflow over 
the engine=2C at the same time reducing drag. I have since then removed tho
se changes again=2C but this has made no difference.
On the contrary=2C the temperature seems to be even higher.
You seem to have had firsthand experience with that problem ? I will try to
 follow your guidelines=2C hoping for success.
I just don't want to spill a lot of coolant all over the engine. One idea i
s to remove the coolant - I have a pump and I can
feed the extraction hose right down to the radiator - and then refilling th
e radiator first=2C and then the rest.
I will keep all informed.
Best regards=2C  Karl

<html><div></div>


From: carl@flyers.freeserve.co.ukTo: europa-list@matronics.comSubject: Re: 
Europa-List: Coolant overheatingDate: Sun=2C 27 Jul 2008 09:05:37 +0100


Hi Karl=2C

I havent been following this thread so I may have missed something.

Firstly is it a new installation - ie: has the aircraft flown before and ev
erything was normal (temperature wise). Is it a Mono or a trigear (ie: does
 it sit on its tail or is it level)

My guess is you definitely have an airlock somewhere. Have you removed the 
air pocket from the port radiator return hose (to the water pump)? To do th
is you need to ease the hose off the radiator connection and release all th
e trapped air in the hose. It can be done by jamming a large screwdriver in
 the top of the hose where it connects the rad - loosen the jubilee clip fi
rst and slide it out of the way. Presumably none of the hoses are kinked or
 crushed (by the engine frame)

If you have a big airlock the cooling system may be working but only interm
ittently - the angle of climb/ descent of the aircraft may affect this. Unl
ess the airlock is cleared the coolant flow will always be restricted=2C bu
t be adequate in the cruise when the engine is running cooler.

The only other possibility (unlikely) is a blockage or a problem with the w
ater pump.

If you remove the radiator cap (when the engine is cold) it should be possi
ble to see the coolant pumping round while the engine is idling but this wo
nt tell you if there is sufficient flow (just that there isnt a major block
age). MAKE SURE YOU TAKE THE NECESSARY SAFETY PRECAUTIONS REGARDING THE MOV
ING PROPELLER - I know its stating the obvious but I dont want your death o
n my hands.

It might be worth draining and refilling the cooling system and backflushin
g everything with a high pressure hose.

Just my ten cents worth.

Carl Pattinson
G-LABS.

----- Original Message ----- 
From: Karl Heindl 
Sent: Saturday=2C July 26=2C 2008 1:29 PM
Subject: Europa-List: Coolant overheating
I have been unable to solve my overheating problem:I had replaced all glyco
l coolant and all hoses. Ever since then the coolant temperatures on the gr
ound and in the climb are way ahead of the oil temperature.After warming up
 the engine the coolant is typically 25 C (45 F) hotter than the oil. The o
il and cylinder head temperatures are always normal. Only in the cruise am 
I getting normal readings. The coolant temp. probe is in the coolant and is
 accurate.I have run out of ideas. Has anyone got any clue about this myste
ry ? Cheers=2C Karl <html><div></div>

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