Today's Message Index:
----------------------
1. 03:17 AM - Re: coolant problems? (Martin Pohl)
2. 07:11 AM - Re: coolant problems? (Roger Lee)
3. 09:20 AM - Re: Re: coolant problems? (george may)
4. 06:34 PM - 912 UL Compression Test (Hugh)
5. 08:20 PM - Re: 912 UL Compression Test (Noel Loveys)
6. 08:40 PM - Re: 912 UL Compression Test (Roger Lee)
Message 1
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| Subject: | Re: coolant problems? |
Roger
I am installing the coolant, fuel and oil hoses at the moment using rubber hose
and Q200 hose clamps (screw type). However I didn't find any recommendations
for torquing of the screw clamps. How much do you torque them to get them tight
enough, but not to harm the rubber hoses?
Thx, Martin
___________________
Martin Pohl, Zodiac XL QBK
Rapperswil, Switzerland
--------
Martin Pohl
Zodiac XL QBK
8645 Jona, Switzerland
www.pohltec.ch/ZodiacXL
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=237952#237952
Message 2
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| Subject: | Re: coolant problems? |
Hi Martin,
Is the Q200 clamp you are describing a clamp that can split into two pieces with
screw/nut on each side? If this is the clamp then picking the appropriate size
will be important.
I don't think I have seen anything in print on an exact torque value. You don't
want to be cutting down into the hose with the clamp. I would tighten them down
until they it is fairly snug. You can't afford to go crazy with the tightening
because the regular screw/worm drive clamps will strip and start hopping
threads then the clamp has to be replaced. I usually tug on the hose to see if
any slipping takes place. Do not pull on the hose so hard as to cause the threads
within the hose to break. Then after a long run up or flight I would check
for tightness again. After many years of doing this I just use good judgment.
Sorry I can't give you a good definitive answer on this one.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Service Center
520-574-1080
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=237970#237970
Message 3
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| Subject: | Re: coolant problems? |
Martin--
Maybe I can be a little more specific than Roger on your question. I've u
sed typical screw type hose clamps on my engines for about 10 years without
any failures.
What I use as an indicator of clamp tightness=2C is the hose bulging up th
rough the "screw slots" on the clamp. The hose should just begin to rise up
through the slots. I also safety wire all clamps.
Hope this helps
George May
601XL 912s
> Subject: RotaxEngines-List: Re: coolant problems?
> From: mpohl@pohltec.ch
> Date: Mon=2C 6 Apr 2009 03:16:21 -0700
> To: rotaxengines-list@matronics.com
>
>
> Roger
>
> I am installing the coolant=2C fuel and oil hoses at the moment using rub
ber hose and Q200 hose clamps (screw type). However I didn't find any recom
mendations for torquing of the screw clamps. How much do you torque them to
get them tight enough=2C but not to harm the rubber hoses?
>
> Thx=2C Martin
>
> ___________________
> Martin Pohl=2C Zodiac XL QBK
> Rapperswil=2C Switzerland
>
> --------
> Martin Pohl
> Zodiac XL QBK
> 8645 Jona=2C Switzerland
> www.pohltec.ch/ZodiacXL
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=237952#237952
>
>
>
>
>
>
>
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>
>
>
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Message 4
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| Subject: | 912 UL Compression Test |
Today I changed the plugs on my 912UL (200 hours on the engine). I also did
a compression check per the Rotax instructions Sec. 12 2.5. Here are the
results of the compression test:
Cylinder 1 Gauge 1Test Pressure 87 psi Gauge 2 pressure 86 psi
1.15% Drop
Cylinder 2 Gauge 1Test Pressure 87 psi Gauge 2 pressure 76 psi
12.64% Drop
Cylinder 3 Gauge 1Test Pressure 87 psi Gauge 2 pressure 86 psi
1.15% Drop
Cylinder 4 Gauge 1Test Pressure 87 psi Gauge 2 pressure 86 psi
1.15% Drop
Every thing looks fine except cylinder 2. The percent pressure drop is still
within the Rotax allowable drop of 25%, but because there is such a large
difference between #2 Cylinder and the other three I am concerned. I
repeated the test on cylinder #2 twice and got the same result. During the
test on number 2 cylinder I also heard air bubbling back through the oil
tank. This seems to tell me that one of the valves was partially open
allowing air to pass out of the cylinder. I assumed that I was on top dead
center because the prop did not move when the pressure was applied. Could I
be slightly off dead center with one of the valves cracked open and the prop
not rotate? I need some advice and guidance as to what I need to do to find
out what the problem is, and how to correct it when I confirm what is
causing the 12.64% drop in pressure in cylinder #2.
Hugh McKay
Allegro 2000
Rotax 912UL (200 Hrs.)
Message 5
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| Subject: | 912 UL Compression Test |
Hugh:
Interesting that most compression tests are done with 80 PSI feed. I'll
keep that in mind for the Rotax.
If you were hearing air in the oil tank then that indicates air passing a
compression ring into the base of the engine then back up the scavenger line
to the oil tank. Sounds like you may have a little something under the #2
ring. You may want to try a little run with some Sea Foam or other cleaner
in the fuel then test again. This may be a good place to run a little E
-10 through it on the ground just before an oil change. Keep an eye on it
and if the compression starts dropping faster, then you may want to have a
closer look at that cylinder.
Noel
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Hugh
Sent: Monday, April 06, 2009 11:00 PM
Subject: RotaxEngines-List: 912 UL Compression Test
Today I changed the plugs on my 912UL (200 hours on the engine). I also did
a compression check per the Rotax instructions Sec. 12 2.5. Here are the
results of the compression test:
Cylinder 1 Gauge 1Test Pressure 87 psi Gauge 2 pressure 86 psi
1.15% Drop
Cylinder 2 Gauge 1Test Pressure 87 psi Gauge 2 pressure 76 psi
12.64% Drop
Cylinder 3 Gauge 1Test Pressure 87 psi Gauge 2 pressure 86 psi
1.15% Drop
Cylinder 4 Gauge 1Test Pressure 87 psi Gauge 2 pressure 86 psi
1.15% Drop
Every thing looks fine except cylinder 2. The percent pressure drop is still
within the Rotax allowable drop of 25%, but because there is such a large
difference between #2 Cylinder and the other three I am concerned. I
repeated the test on cylinder #2 twice and got the same result. During the
test on number 2 cylinder I also heard air bubbling back through the oil
tank. This seems to tell me that one of the valves was partially open
allowing air to pass out of the cylinder. I assumed that I was on top dead
center because the prop did not move when the pressure was applied. Could I
be slightly off dead center with one of the valves cracked open and the prop
not rotate? I need some advice and guidance as to what I need to do to find
out what the problem is, and how to correct it when I confirm what is
causing the 12.64% drop in pressure in cylinder #2.
Hugh McKay
Allegro 2000
Rotax 912UL (200 Hrs.)
Message 6
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| Subject: | Re: 912 UL Compression Test |
Hi Guys,
First thing is Rotax leak down compression test is done at 87 psi and not the standard
80 psi like Lycoming's and Continental's. Run your engine once and do
the test on number two cylinder again, I will bet it goes up to the other ones.
I have had this happen once or twice and a run with a retest and it was fine.
The engine also need to be up to temp. So I do a carb balance on it as one of
my last issues on an inspection and then the compression test after I shut down.
Do not do a compression test on a cold Rotax. You should not hear any leaking
air in the exhaust or the intake, but you will absolutely hear a little in
the oil tank and that is normal. Where do you think the extra 2-3 psi of air
goes on the leak down. Normally I see 87 over 85-84 for normal test pressures.
Here is a picture of a little test tool I made for compression test. Easy and
cheap to make.
And while I'm thinking of it you do not use any antisieze on the spark plug threads.
It is mandated in the Rotax manual to use a heat conducting paste. You can
pick some up from Lockwood Aviation in a little clear packet or a larger tube.
One little packet will do one plug change. Do not get any paste near the plug
electrode. Keep the paste up at least 4 threads. It will cause misfires, it
is a silicone base.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Service Center
520-574-1080
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=238100#238100
Attachments:
http://forums.matronics.com//files/compression_tester_end_201.pdf
http://forums.matronics.com//files/compression_tester_181.pdf
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