Today's Message Index:
----------------------
1. 06:26 AM - Carb and gearbox rebuilds (Roger Lee)
2. 06:00 PM - Re: Re: Engine roughness (Hugh McKay)
3. 09:31 PM - Rotax 912ULS gearbox tear down (Roger Lee)
Message 1
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| Subject: | Carb and gearbox rebuilds |
Hi All,
If any one wants to have their carbs rebuilt I will do them for $50 plus parts
and If you need your gearbox rebuilt or shimmed I can do those, too. Carbs are
a one day turn around. Give me a call or an email if I can be of assistance.
If you have a 1990-1999 year Rotax 912 engine or a high time engine (800 plus
hrs.) then I would recommend the carbs being done.
--------
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=308491#308491
Message 2
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| Subject: | Re: Engine roughness |
Roger,etal
Well, in the course of balancing my carbs a friend of mine ask me to check
to make sure nothing was coming in contact with the pick-ups for the
ignition circuits. All were fine except one. On my Allegro one of the
cooling pipes drops down vertically near the back of the engine. This
aluminum pipe was barely touching the pick-up for what I believe to be
ignition circuit B. On page 121 in the Lockwood Aviation Supply Catalogue
the pick-up I am referring to is the one shown as number 3. I assume the
wiring diagram as shown is as if you are looking at the back of the engine.
I corrected the position of the aluminum pipe so it cleared the pick-up an
finished balancing the carbs. I noticed one of the small wires on the
pick-up looked like it had the insulation worn off in one spot. I took a
small amount of silicone and covered the spot. After finishing everything I
decided to test fly the plane. During the normal starting procedure
everything went fine and I taxied to the hold point. At the hold point I was
going through the normal checks, one of which is an ignition check (i.e. I
ran the engine up to 4000 rpm and killed one switch. The rpm drop was
normal. When I killed the other switch the engine immediately shut off. I
quickly opened the switch and the engine caught an ran fine. This alarmed me
so I backed the engine down, revved it back up to 4000 rpm and the same thin
happened. I began to taxi back to the hanger, but decided to try the circuit
again. This time everything was normal. I did this three or four times and
everything was normal so I decided to fly.
I flew around the "patch" for about 30 minutes with no problem, so came back
an landed. I decided to fly one more pattern, but I though I would check the
ignition circuits again. This time when I "killed" the first circuit all was
fine. But when I "killed" the second one it failed again and shut the engine
down. This time I took it to the hanger. Help!!!!!!
Hugh McKay
Allegro 2000 ELSA
Rotax 912 UL
--------------------------------------------------
From: "Roger Lee" <ssadiver1@yahoo.com>
Sent: Tuesday, August 10, 2010 4:54 PM
Subject: RotaxEngines-List: Re: Engine roughness
>
> Hi Hugh,
>
> Those mixture screws should be set before a pneumatic balance. Since you
> now have those set you absolutely need to do a pneumatic balance. Leave
> the screws at 1.5 turns out. The roughness is because they are helping
> with the mixture at the low rpms. As you go above 3500 rpm to 4000+rpm
> that circuit now longer is in play. After the pneumatic balance I would
> bet your engine will be smooth.
>
> --------
> 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=308271#308271
>
>
>
Message 3
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| Subject: | Rotax 912ULS gearbox tear down |
Hi All,
Here are some pictures from a Rotax 912 gearbox. This is being torn down and examined
from a prop strike on an RV-12.
You will see a gearbox clutch in one of the pictures and they are installed in
the 912ULS 100 hp, but not the 912UL 80 hp. Everything has to come out including
the oil seal and bearing. A dye penetrant test now needs to be done down by
the bearing opening. The shaft was checked for run out tolerances on the flange
and crankcase shaft. These happen to be okay on this plane, this time. that
isn't always the case. If you are going to have a prop strike do it at idle or
engine off. High speed strikes don't do the prop shaft any favors.
I thought some of you may enjoy looking at the inside of a gearbox.
--------
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=308616#308616
Attachments:
http://forums.matronics.com//files/binder3_154.pdf
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