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HomeAircraftHelicopterAlignT-REX 600N › Should I replace it?
01-03-2013 08:25 PM  5 years agoPost 1
ebonicrobot

rrApprentice

East Bay, CA

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Have my engine apart and thinking of changing my clutch liner. Is the gap to large?

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01-03-2013 09:11 PM  5 years agoPost 2
BigMc70

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Abilene, Texas-USA

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wrap the clutch with two complete wraps of standard note book paper that has been cut into a strip that is not much wider than the clutch it self. It should just fit with out pushing the paper off the clutch if its a loose fit it might not be a bad idea to replace it. The clutch will fail due to breakage if the gap is too large. The rule of thumb is .004 gap all the way around. Hope this helps and Happy Flying.

Raymond McFaul
Team Grand RC

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01-03-2013 09:18 PM  5 years agoPost 3
fastflyer20

rrKey Veteran

N. Tonawanda, NY

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That gap is way too big, relining it is actually better than new Align parts. Some have found thicker liners, I use paper behind a standard liner, usually .007" paper is just about right. 30 minute epoxy is what I have found works best. Old liner will remove very easy with enough heat.

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01-03-2013 10:53 PM  5 years agoPost 4
ebonicrobot

rrApprentice

East Bay, CA

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Thanks for the advice. All I have is some Blue align liner so hopefully it works. It really doesnt look much thinker than this. Never heard of putting paper behind it to close the gap. Works pretty good?

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01-04-2013 12:32 AM  5 years agoPost 5
fastflyer20

rrKey Veteran

N. Tonawanda, NY

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Blue liner, 30 min epoxy and some paper and you have all you need. I have been using paper shims for years. Getting the gap right is the most important part. For the paper, .007" is fairly thick, most copy paper is .004" or slightly less so hunt around for some thicker paper, some ad inserts in magazines are the right thickness.

Procedure:
Remove old liner
Scrape off the residue from bell
Degrease with alcohol, acetone, etc
Cut paper to size, test fit
Cut liner length test fit
Install liner (no glue)
Tape clutch and test for a semi tight fit
Pull it apart
Use an acid brush (or similar) for a light coat of epoxy on bell
Install paper
Apply another light coat on top of paper
Install liner
Install taped clutch
Wipe excess epoxy with alcohol soaked rags and q-tips.

I usually tap out the clutch after 4 hours and clean any remaining epoxy overflow then reinstall the taped clutch and let it dry overnight.

So .007" x 2 = a .014" reduction in the gap! I confirm by measuring with calipers. Measure bell ID and subtract clutch OD, that is the total clearance, this seems ideal at .016" to .022", (that = a .008" to .011" gap per side).

Much tighter and the clutch drags too much at idle, looser and it will slip too much in flight. A large gap also causes the clutch shoes to flex too much causing them to break.

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01-04-2013 01:56 AM  5 years agoPost 6
ebonicrobot

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East Bay, CA

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Thanks, this was the first i heard of the paper shims. I actually found an extra Lynx Heavy duty clutch liner for a 700 i used in the pass. with a little trimming it was a perfect fit! It's slightly thicker than the blue 600 liner.

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01-26-2013 02:12 PM  5 years agoPost 7
ICUR1-2

rrElite Veteran

Ottawa, Ontario

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I was thinking of using paper/cardstock to shim the liner.
glad to hear that it works

spending time, paying attention

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01-27-2013 01:18 AM  5 years agoPost 8
Zaneman007

rrElite Veteran

Texas - USA

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Standard printer paper works
I have performed the method above with excellent results.

I use two layers of electrical tape around the clutch shoe and then assemble so that everything is snug in the housing.

Keep in mind that you can add as many layers as you need, but I don't think you'll need as much as you think. At least that was the case for me.

Old Guys Rule!

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