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Starter question

 
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Lew Gallagher



Joined: 04 Jan 2008
Posts: 396
Location: Greenville , SC

PostPosted: Sun Nov 01, 2009 9:29 am    Post subject: Starter question Reply with quote

Hey Guys,

Here's a quick question. We bought a rebuilt Lycoming IO 540 that came with a starter installed. We're getting close to final assembly and I noticed that the throw-out gear that engages the ring gear seems spring loaded to stay engaged. On cars, this is opposite and retracts after starting. Does this somehow work the same way -- once it fires the gear spins back? Or is it something I should look into? I can get the model of the starter later today if that's necessary. I noticed this after testing the switch/relay/starter circuit by bumping the starter switch with the ring gear off. Thanks.

Later, - Lew


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PostPosted: Sun Nov 01, 2009 10:13 am    Post subject: Starter question Reply with quote

On 11/1/2009 12:29 PM, Lew Gallagher wrote:
Quote:
We're getting close to final assembly and I noticed that the throw-out gear that engages the ring gear seems spring loaded to stay engaged.

Hi Lew,
Once the engine starts the starter gear is disengaged from the starter
ring.

-Dj

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PostPosted: Sun Nov 01, 2009 10:48 am    Post subject: Starter question Reply with quote

Assuming this is an older aviation starter, what you are looking at is a starter Bendix.  Unlike automotive (and some new aviation) starters, these older starters use a Bendix mechanism that engages when the starter is turned and retracts when starter is disengaged.  When maintained properly, starter Bendix work well enough but solenoids work better.
 
If that starer is bad, upgrade to a Skytec NL starter with an in-line solenoid.
 
William
http://wcurtis.nerv10.com/
On Sun, Nov 1, 2009 at 1:29 PM, Lew Gallagher <lewgall(at)charter.net (lewgall(at)charter.net)> wrote:
Quote:
--> RV10-List message posted by: "Lew Gallagher" <lewgall(at)charter.net (lewgall(at)charter.net)>

Hey Guys,

Here's a quick question.  We bought a rebuilt Lycoming IO 540 that came with a starter installed.  We're getting close to final assembly and I noticed that the throw-out gear that engages the ring gear seems spring loaded to stay engaged.  On cars, this is opposite and retracts after starting.  Does this somehow work the same way -- once it fires the gear spins back?  Or is it something I should look into?  I can get the model of the starter later today if that's necessary.  I noticed this after testing the switch/relay/starter circuit by bumping the starter switch with the ring gear off.  Thanks.

Later, - Lew

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Lew Gallagher



Joined: 04 Jan 2008
Posts: 396
Location: Greenville , SC

PostPosted: Mon Nov 02, 2009 4:04 pm    Post subject: Re: Starter question Reply with quote

Thanks for the responses DJ and William.

After further research, this is a Kelly Aerospace MZ 4222 starter and the drive gear disengages once the engine reaches 400 rpm. It lists for $1272 new ... wow. Rebuilt $365 w/ $200 core charge.

Probably much heavier than the Skytec starters, but we'll see how it works.

Later, - Lew


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PostPosted: Mon Nov 02, 2009 4:23 pm    Post subject: Starter question Reply with quote

You probably ought to plan now to get the correct Skytec as they are less
than half the weight and (IIRC) have no Bendix which requires lubrication
and cleaning. If your current starter is new you may be able to trade to get
the Skytec.

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