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Cold starting problems

 
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peter.rees01(at)tiscali.c
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PostPosted: Tue Jan 24, 2006 3:13 pm    Post subject: Cold starting problems Reply with quote

We are still having tremendous problems getting HI started in the cold.
We've replaced the battery but the engine still shakes violently when
cranked and seems to run in whats been described as 'sub idle' before we
execute a somewhat rapid shut down.

Once it has started, it runs very nicely - never missing a beat and it
starts very well indeed when warm - on the button every time.

Trawling the archive gives me the very strong impression that our sprag
clutch is due for the bin but I'd rathter get someone familiar with Rotax
starting problems before changing such an expensive part (or getting it done
more like!) and finding out that its one of the carbs!

Can anyone tell me - is it possible to remove the starter without taking the
engine out in a 912 classic?

Conrad seems to be pretty well booked up at present - has anyone used Adrian
Lloyd? If so (and he is any good) - does anyone have a contact number for
him (or anyone else that can be recommended).

Really need to get this sorted before the starter or engine frame quits.

Thanks in anticipation

Peter


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paul.mcallister



Joined: 09 Jan 2006
Posts: 177
Location: Waukesha, WI USA

PostPosted: Tue Jan 24, 2006 5:11 pm    Post subject: Cold starting problems Reply with quote

Peter,

Lockwood Aviation in the US recommend having the gearbox clutch adjusted
every 300 hours. I sent mine in and they replaced it, I am assuming that
there wasn't any adjustment left. It cost me about $140.00 including
freight to have the work done.

Paul


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rholder(at)avnet.co.uk
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PostPosted: Wed Jan 25, 2006 1:27 am    Post subject: Cold starting problems Reply with quote

Quote:
We are still having tremendous problems getting HI
started in the cold. We've replaced the battery but the
engine still shakes violently when cranked and seems to
run in whats been described as 'sub idle' before we
execute a somewhat rapid shut down.

Quote:
Trawling the archive gives me the very strong
impression that our sprag clutch is due for the bin but
I'd rathter get someone familiar with Rotax starting
problems before changing such an expensive part (or
getting it done more like!) and finding out that its
one of the carbs!

Quote:
Can anyone tell me - is it possible to remove the
starter without taking the engine out in a 912 classic?

Mine is an XS firewall forward so I am not certain, but I

believe a starter motor out job on a classic f/f/w
requires engine out.

Quote:
Conrad seems to be pretty well booked up at present -
has anyone used Adrian Lloyd? If so (and he is any
good) - does anyone have a contact number for him (or
anyone else that can be recommended).

Adrian changed mine for me, in situ. I recommend him !

Quote:
Really need to get this sorted before the starter or
engine frame quits.

What I am nor sure of is whether the shaking is caused by
the worn sprag clutch or whether the worn sprag clutch has
been caused by the non-starting and kick-back.

The kick-back is caused by the starter just not being man
enough to do the job. (912S). Adrian put a HD starter on
for me and the engine starts instantly now.

If yours is a 912 then Peter Jeffers may help - he was
having similar problems and changed his sprag clutch at
around 1000 hours.

I understand that the HD starter motor will not fit inside
the classic engine mount. It is only a matter of 1/4 inch
or so. Maybe some judicious cutting and rewelding might
work (if approved !) or a large hammer ?

Richard


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nigelcharles(at)tiscali.c
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PostPosted: Wed Jan 25, 2006 11:40 am    Post subject: Cold starting problems Reply with quote

Quote:
>Can anyone tell me - is it possible to remove the starter without
taking the engine out in a 912 classic?<<


The Classic engine mount obscures the starter from removal with it in
situ. Its close proximity to the engine also means that the more
powerful starter cannot be fitted. Modifying the frame is not possible
as the area that needs modification also happens to be the position of
the head of the top starboard engine mount bolt. Any upgrade to the more
powerful starter means changing to the XS mount which means a full
upgrade to XS firewall forward. I have done this and the new starter
seems to solve the kickback problem. With this in mind I would say that
the combination of the Classic and the 912S is not good unless you like
regular sprag clutch replacements.
Quote:
Conrad seems to be pretty well booked up at present - has anyone used
Adrian Lloyd? If so (and he is any good) - does anyone have a contact

number for him (or anyone else that can be recommended).<

Adrian replaced my sprag clutch for me. He has done quite a few now. I
can fully recommend him. His number is 01885 482504.

Regards

Nigel Charles


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peter.rees01(at)tiscali.c
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PostPosted: Wed Jan 25, 2006 12:15 pm    Post subject: Cold starting problems Reply with quote

Hi Nigel

Thanks for the contact info - I'll give him a call.

Ours is a 912, not the 912s. I'll give Adrian a call and ask his opinion.

One thing I had thought of trying was to fine off the prop - its about 18
degrees at the moment - maybe this is restricting the speed that the starter
can turn the engine - Do you think this could be worth a try??

Thanks once again for contact info.

Peter
---


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nigelcharles(at)tiscali.c
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PostPosted: Thu Jan 26, 2006 2:15 pm    Post subject: Cold starting problems Reply with quote

Quote:
One thing I had thought of trying was to fine off the prop - its about
18

degrees at the moment - maybe this is restricting the speed that the
starter
can turn the engine - Do you think this could be worth a try??<

I doubt whether there is a significant change in drag for various prop
settings at such low rpm.

Nigel


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