Today's Message Index:
----------------------
1. 06:43 AM - Re: Vibration - suspect gearbox? (Catz631@aol.com)
2. 09:44 AM - Rotax 9112 ULS Starter Oddity (JohnF)
3. 10:35 AM - Re: Rotax 9112 ULS Starter Oddity (FLYaDIVE)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Vibration - suspect gearbox? |
Gordon,
We had a similar problem on a Paradise P-1.(912ULS) The vibration would
start at power reduction and would continue at cruise. If you go to full power
it would smooth right out.
We thought it might be the prop so we changed it to no avail. It still did
it. We checked every part of the airframe and engine
(bolts,cracks,mounts,etc). I even took the airplane up shut down the engine and
flew the aircraft
thru stall to almost VNE and there was no vibration in the airframe so we
were convinced it was engine related.
This was a long story going on for many months of frustration but to
summarize we finally sent the gearbox off to Lockwood for a rebuild as a last
resort. THAT solved the problem.
So yes, it might be the gearbox.
Dick Maddux
Milton,Fl
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Rotax 9112 ULS Starter Oddity |
117 hrs on the Rotax. No real problems but a few days ago when turning
the start switch the starter did not engage, but seemed to "jam" and
didn't turn. Upon retrying it engaged and started normally. I suspected
a low battery, but overnight charging didn't change anything. This
morning again with as fully charged battery it did the same thing, but
started right up on second try.
I tried to demonstrate this to two other pilots and everything was
normal; prop turned over immediately with nothing abnormal happening on
two consecutive starts.
I seems (a wild guess) that the starter gear teeth are hitting, rather
than meshing, with the engine.
Not to sure what to make of this.
John
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Rotax 9112 ULS Starter Oddity |
John:
I have seen and heard this on other types of engines. Here is what I would
check:
1. Is the started lubricated properly? Properly does not mean with the
recommended lubricant. I find a VERY thin lube of Moly Grease
works extremely well and lasts for years. NOTE: More is NOT better - A
VERY thin coat.
2. Is the started secure in the mounting? Some starters have locking
tabs under the mounting nuts & bolts. And I use Loctite Blue in addition.
3. Is the starter ring gear secure? Or better question would be are the
mounting holes deformed? If they are deformed the ring gear could be off
by just enough so the starter hits the teeth.
4. ELECTRICAL - Check all the connections... Do NOT just look. Remove
the connection, clean all the connection install NEW Star Washers and
torque properly. I should have made this item 1, since it is the
most prominent.
5. STARTER RELAY - Checking ALL the electrical from above and continue
to check the Starter Relay. A poor connection will result in exactly what
you describe. A relay with carboned internal contacts will also show the
same conditions. On the first attempt the carbon is too much and poor
contact results and the starter receives a weak voltage. On the second try
the carbon has been arced through or knocked off and a better contact is
made... Engine starts, but there is carbon left behind and the problem
repeats. Time for a new Starter Relay.
6. STARTER SWITCH - Since you are doing all the work and for S&G's, mite
as well check the Starter Switch - A little Contact Cleaner.
OK - You checked and done it all. Go FLY.
Barry
On Tue, Oct 9, 2012 at 12:43 PM, JohnF <n29cx@ridgeviewtel.us> wrote:
> **
> 117 hrs on the Rotax. No real problems but a few days ago when turning the
> start switch the starter did not engage, but seemed to "jam" and didn't
> turn. Upon retrying it engaged and started normally. I suspected a low
> battery, but overnight charging didn't change anything. This morning again
> with as fully charged battery it did the same thing, but started right up
> on second try.
>
> I tried to demonstrate this to two other pilots and everything was normal;
> prop turned over immediately with nothing abnormal happening on two
> consecutive starts.
>
> I seems (a wild guess) that the starter gear teeth are hitting, rather
> than meshing, with the engine.
>
> Not to sure what to make of this.
>
> John
>
> *
>
> *
>
>
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|