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Home✈️Aircraft🚁HelicopterAlignT-REX 700N › 700N new clutch seems tight: no gap at all with new parts
05-08-2013 04:54 AM  6 years ago
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rhodesengr

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Pleasanton, CA USA

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700N new clutch seems tight: no gap at all with new parts
first time replacing the clutch. I have a brand new stock clutch bell with liner factory installed and there is essentially no gap with either the old stock clutch or a brand new Lynx clutch. Is that the way it is supposed to be or should there be some gap? In fact the stock clutch is tighter than the Lynx.

All the other threads about the clutch talk about too much gap not too little. Do I assemble as is or sand something to get some clearance.
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05-08-2013 01:53 PM  6 years ago
Four Stroker

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Atlanta

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Well first measure the gap accurately. Auto feeler gauges are OK. Calipers would be better. Clearance can vary widely depending on design of the clutch but is generally in the .006" to .012" on each side (radial clearance). The 600N likes about .008" new.
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05-08-2013 02:41 PM  6 years ago
jschenck

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La Vista, NE.

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Some more info - measure your gap, it's the only way to make sure it's right

https://rc.runryder.com/t702682p1/
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05-08-2013 03:53 PM  6 years ago
rhodesengr

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Pleasanton, CA USA

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I have calipers but the measurment on the lined bell is a little uncertain. Going by feel its a friction fit and if i put the cluthc all the into the bell I can not turn it by hand. That just seems too tight as it is semi-engaged at zero RPM.

Again, these are brand new parts. A factory lined Align cluth bell and either a brand new Lynx clutch or the original used Align clutch.

If the gap is too small, how does one adjust it? Sand the liner?
Sand the clutch? Squeeze the clutch? I have seen all these options.
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05-08-2013 03:59 PM  6 years ago
BigMc70

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Abilene, Texas-USA

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I would sand the liner till you can set the clutch in with two layers of notebook paper wrapped tightly around it thats a good gap that grabs at a lower rpm.Raymond McFaul
Team Grand RC
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05-08-2013 04:27 PM  6 years ago
Four Stroker

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Atlanta

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As Dave Shadel once said, a dollar bill (or std. copier paper) is .003" thick.
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05-08-2013 06:30 PM  6 years ago
Glenn Goodlett

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California

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Put it together, if you can get it started, it will be fine.
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05-08-2013 06:47 PM  6 years ago
rhodesengr

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Pleasanton, CA USA

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my concern is the the head will spin even while starting. Having bought the parts from Amain, I called them. They said you have to "run in" the new clutch by holding the blade grips while running the engine. Sounds dangerous. Be nice to have at least a slip fit before I assemble it. As of now its a tight interference fit.

I am thinking about either some liner sanding or somehow spinning the clucth with a drill motor and use that as a tool to run-in the liner. I don't have a real good way to hold the two parts while i try this.
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05-08-2013 10:47 PM  6 years ago
jschenck

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La Vista, NE.

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^^^ I've done that several times.

Put the starter shaft into the clutch bell then put the clutch in there upside down. use a hand drill to spin the clutch/starter shaft. If the gap is right it should spin pretty free. I've used this technique to cut off high spots when I've glued in my own liner.

just held it in my hands. use a shop towel so if it does slip it doesn't take skin off.
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