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Home✈️Aircraft🚁HelicopterAlignT-REX 700N › 700N Starter Shaft not Engaging.
04-01-2013 11:50 PM  6 years ago
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NQNArrElite Veteran - USA -
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700N Starter Shaft not Engaging.
I've had two different Align starter shaft/clutch combinations and both have had issues during starting. The oneway bearing fails to consistently engage the starter shaft, making starting the engine a problem.

Does anyone know of a fix for this issue using the Align parts?
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04-02-2013 05:07 AM  6 years ago
Wesley-G

rrApprentice

Elmont NY

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The one way in the clutch is the problem you can try cleaning the one way really good with the brake cleaner and using some sand paper on the one way shaft 400 or 800 rubbing up and down on the barrel to help the barrel grab better also for temp solution you can let your starter spin for about 10 seconds in the one way let it come to a complete stop then hit the starter again the heat from the start shaft spinning will help the shaft grab the one way.Team Minicopter-Team MKS-Team Byron fuels-Team Pulse Batteries
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04-02-2013 08:35 AM  6 years ago
McKrackin

rrProfessor

Lucasville,Ohio

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The little 6mm socket also slips on the shaft sometimes.
It's hard to get those things together right.

What I'm saying is...the start shaft may not even be turning.

Next time you try to start it and the engine isn't turning over...turn it a few seconds and then stick your finger in the socket you insert the starter in....If it's hot,it's slipping.
I literally never use the word literally right.
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04-02-2013 05:58 PM  6 years ago
lightningrc

rrElite Veteran

UK

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Plus 1 , the new starter shafts don't have much of an ident ethier where the grub screw locks .
I grind atleast one of them flat so shaft can't spin in collar , not too much though or u will weaken shaft and it will shear off .
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04-02-2013 05:59 PM  6 years ago
lightningrc

rrElite Veteran

UK

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Plus tighten and lock tite as if ur life depends on it
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04-02-2013 10:38 PM  6 years ago
NQNA

rrElite Veteran

USA

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No it's not the set screws, it's down in the clutch oneway bearing.

I think that too much lubrication of the bearing might cause the problem. I think I might try the sandpaper,roughing the oneway shaft barrel idea.

Btw this is a brand new clutch/starter shaft that is having the problem
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04-02-2013 10:41 PM  6 years ago
McKrackin

rrProfessor

Lucasville,Ohio

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How do you know?
The set screws stay tight even if they're slipping.

Did you pull the socket off and look?
Did you check for heat?

I'm not saying you're wrong but that is the most common cause of your issue and it's ALWAYS a brand new one slipping because it was put in wrong.

If it works the first time,it's good for a long time.
I literally never use the word literally right.
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04-03-2013 09:33 PM  6 years ago
jschenck

rrProfessor

La Vista, NE.

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roughing up the starter shaft could make it worse. Oil should make it better.

Skipping spraq's are usually dirt or dented shafts from my experience. This allows the 'fingers' of the sprag to skip rather than grab the shaft. Also if the shaft and sprag are out of alignment that could cause it to slip.

One trick I've learned is to take the glow plug out of the engine then spin the engine/starter shaft assembly with your starter as you carefully tighten down all the bearing block bolts and motor mount bolts in the frame halves. This allows the engine and clutch stack and start shaft stack to line up as you tighten them all down. Use a pattern and tighten each bolt a little, working your way around the assembly.

Also need to make sure your clutch is centered. I try for a runout of .001" with my 90's but have accepted .0015".

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