Today's Message Index:
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1. 03:02 AM - Re: How to replace 912uls starter motor (JonathanMilbank)
2. 07:01 AM - Re: How to replace 912uls starter motor (Erich Trombley)
3. 07:14 AM - Re: How to replace 912uls starter motor (Bud Yerly)
4. 10:16 AM - Re: How to replace 912uls starter motor (Ron Peach)
Message 1
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| Subject: | Re: How to replace 912uls starter motor |
Hand propping? I seem to recall that this has been done before. Several years ago
I learned the hard way that one of my ignition circuits was live, while preforming
the preflight gurgling/burping. Supposedly the engine must be cranking
quite fast before the plugs "come alive", but I no longer believe that.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=515456#515456
Message 2
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| Subject: | RE: How to replace 912uls starter motor |
Hello Ron,
I just finished the job not two days ago. I have a 914 in a classic with the XS
engine mount and standard starter. Download the heavy maintenance manual and
read the procedure. Rotax do a good job of explaining the process. The
illustrated parts catalog is also helpful to understand the assembly of the starter.
The job is really straight forward but access to the hold down clamp was challenging.
I recommend removing the lower cowl to get better access to the head
of the bolt on the hold down clamp.
My starter had been in place for over 25 years. Suggest applying penetrating oil
to bolt if possible. Unfortunately, access to the head of the bolt precludes
using a wrench or socket as the Rotax ring mount is in the way. I used the
largest flat head screwdriver that fit in the slot which had a hex shaft to
allow the application of a wrench. While pressing hard it keep the screwdriver
engaged I was able to break the bolt free with by turning the shaft of the screwdriver
with a wrench.
Next you will need to unbolt the exhaust bend at the cylinder head (13mm)to gain
access to the two 8mm mounting nuts which secure the starter to the engine.
I found that for the top nut on the exhaust a 12- point thin walled socket on
a long extension worked really well. The bottom nut can only be removed with
an open end wrench. The 8mm mounting nuts can be easily removed with a 12-point
box end wrench. A 6-point box end will not work!
With the hold down clamp loose and the 8mm nuts removed carefully extract the starter
from the engine keeping the starter together as an assembly. I used a
flat blade screwdriver to gently pry it out of the engine case.
Do not just pull on starter or the body will separate from the bearing flanges.
Its the 8mm nuts that keep everything together.
Fish the starter out from the back of the engine mount.
Reverse the process to install new starter. The HD starter uses a different mounting
arrangement and I cant speak to the ease of installation. For the 912ULS
the HD is preferred.
Good luck!
Erich Trombley
N28ET
Classic Monowheel 914
Message 3
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| Subject: | Re: How to replace 912uls starter motor |
Guys,
A good cleaning of a starter should be done between 5 and 10 years (but I n
ever did it). The parts for a complete rebuild are only $100 USD and is no
t difficult. Some cleaner and new grease is all that is necessary. Clean
the contacts with Scotch Brite re-lube and reinstall. The magnetic attract
ion on assembly is a pain but a few sticks of the proper size will allow yo
u to move the starter parts into place. You learn quite a bit on a rebuild
. Once complete, test your starter (securely hold it down of course) to be
sure of your work.
In my case, I have a Classic trigear A054A with a 914. I have the XS firew
all forward kit, so the installation of the new hi-torque starter was a bre
eze, well sort of. The high torque starter will start a 912/914 easily as
RPM on a slightly discharged battery will still hit 500 RPM. I wrote about
this some years ago.
Installation notes from memory:
I find removing the carb and tray under the carb to be a help. Don't fiddl
e with the throttle and choke cables, just lay the carb aside carefully. I
remove the oil tank and set that aside also.
If memory serves (and it doesn't so well anymore) the starter nuts holding
the housing come off the drive end for the installation. I use thin safety
wire to hold the new starter housing securely in place during the installa
tion until I have the starter fully seated and the nuts installed but not t
ight. Then cut the safety wire and pull up the nuts. Use Loctite on the n
uts for trouble free operation. Remember, a loose starter will destroy you
r clutch.
Keep a magnet handy as it is needed to retrieve nuts and washers and such.
It is a cramped and tight spot to work in. Even with the carb and oil can
moved aside.
The Classic engine frame on the 80 or 100 horse 912 interferes with the ins
tallation of the hi-torque starter as it is longer and is not a recommended
upgrade in my opinion, as modifications are needed to the frame for proper
clearance. Frankly on the 80 HP 912 the high torque starter is not necess
ary unless in cold climates or with a weak battery. With anything electric
al also check your wire connectors for looseness or corrosion and remove, r
epair or replace. You need good clean and tight connections on your starte
r wiring circuit.
Best Regards,
Bud Yerly
Message 4
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| Subject: | Re: How to replace 912uls starter motor |
Thank you everyone for your responses. I have a clear mental picture of the task
ahead. I will let you know how it goes!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=515459#515459
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