Wow, very astute, guys! The engine used an
old 24v TCM boat-anchor style starter for the first 275 hours. I installed a
12v ST3 style starter back in 2006 and now have 10 hours on it. I’ll get
the exact part number from my starter and get in touch with SkyTec to see if it’s
up to the latest spec.
Thanks for the great info!
From: ED MARTIN
[mailto:edmartintx@gmail.com]
Sent: Friday, April 20, 2012 11:05
AM
To: Paul Miller
Cc: Adam@ValidationPartners.com
Subject: Re: [LML] Re: TCM starter
adapter (was Excessive down hydraulic pressure)
Paul ..... Ask him if
he has the SkyTec ST5 or ST3 ?? The ST5 has the relay to disconnect
the starter from the adapter after the engine starts .... but the ST3 does
NOT. Doug & Randy have ST3 starters and both
were beginning to slip as of last month. At KLAL show, Aero
Specialities was recommending a new SkyTec ST5 AND an properly overhauled
starter-adapter as the best solution. Ed
.......
On Fri, Apr 20, 2012 at 9:21 AM, paul miller <pjdmiller@gmail.com> wrote:
It depends on the Skytec model and what has been on as a starter since
the replacement. If the same starter is on then you probably have
the same issue and no matter which starter is on-- it won't get better.
If you changed the starter at the same time as the adapter then which model is
on there now? My research says 200-300 hours with a problematic starter
is really good, I got 500 and was an ISKRA "poster pilot". Most
fail much earlier in the 200 hour range and many Legacy owners seem to have
swapped out adapter very early--mine before the plane even flew.
The lightweight geared starters (ISKRA and some earlier Skytecs) have gearing
friction which prevents the adapter spring from fully unwinding. My
understanding of the issue is that you then fly a couple hundred hours while
that spring wears down the clutch shaft. I have all the photos to show
how that happens. The clearance grows and the problem magnifies.
You have all the symptoms of soon being out of start capability and you want
that to occur at your home airport not somewhere else because you need an
engine hoist and a few weeks to repair or a few days to exchange adapters.
The fix for the adapter is fairly straightforward and there are lots of options
for repair, exchange etc. The starter issue must also be
addressed. The newest Skytecs have a clutch that disengages the adapter
and this is supposed to solve that problem. The older Presotlite and TCM
starters have terrific start torque, no gearing and weigh more but they last
forever. You get one of those from an overhaul shop that measures the
break torque to a few in-ounces and that's the key to a long adapter
life. They are also not expensive either.
Best to determine the existing starter and see if you can determine if the
adapter is standard, M15, M30 or M45 sizing. Go from there.
Paul
Legacy
Spruce Creek
On 4/19/2012 12:43 PM, Adam Molny wrote:
Paul – boy, I hope not. I already have the lightweight Skytec
starter, which is supposed to be friendly to the starter adapter. The starter
adapter was replaced at 50 hours by the previous owner of this engine (it now
has around 275hrs). I’ll keep an eye on the situation to see if gets
worse.
I’m not aware of any options or choices to be made regarding
the starter adapter. You simply have it rebuilt or replaced. Is that correct?
Thanks,