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HelicopterFuel-Helicopters New or Limited ActivityElyQ › Aligning the clutch stack - Competition
12-28-2009 09:55 PM  7 years agoPost 1
jschenck

rrProfessor

La Vista, NE.

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I'm just about finished building my Competition now. I think I see why some guys are getting the starter shaft seized in the clutch. If the bearing blocks are not lined up straight with engine crankshaft then the starter shaft drags hard and even freezes against the spraq. I ran into this while assembling everything. I verified that the problem was due to the bearing block alignments by pulling one bolt from the top and one from the bottom bearing block. The top one was against the frame where the lower bolt was a little back. Here's what I did to get everything a bit straighter.

1. Loosen the engine mount against the frame, bolts are ran up to contact but no pressures

2. loosen the bearing blocks, same - bolts ran up to contact, no pressure.

3. bump the starter a few times

4. press the pinion into the main gear as tight as my finger pressure would push it. Snug up the bearing block bolts.

5. Pull two of the bolts off, one upper, one lower. See if the two blocks are in about the same spot in the slots.

6. drop of loctite on each bolt, putting them in until contact, no pressure. Once they are all in start tightening them down in a cris-cross pattern, bumping the starter and hand spinning the starter shaft to see if it's still running free. I use a 2nd loose starter wand to spin the starter shaft.

7. Now add the loctite to the engine mount bolts. Tighten down in a pattern while bumping the starter. I also check the starter shaft by hand to see if it's spinning smooth. I found that pushing the engine around would free up the shaft more than just letting it rest there. Snug it up slow and try to push it into alignment. You can feel when it's right by spinning the starter shaft by hand with the wand.

Now we see if it works in the field - once it thaws out around here (a few months from now)

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12-29-2009 01:45 PM  7 years agoPost 2
oragami

rrVeteran

Florida

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Nice Information, Thanks for sharing.

Craig

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12-30-2009 07:20 PM  7 years agoPost 3
Vance

rrVeteran

York ,PA

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"4. press the pinion into the main gear as tight as my finger pressure would push it. Snug up the bearing block bolts."

Wouldn't this cause the gear mesh to be too tight?
Thanks
Vince D

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12-30-2009 07:37 PM  7 years agoPost 4
jschenck

rrProfessor

La Vista, NE.

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mine is too tight now I'm expecting it to loosen up after the pinion and main gear bed together.

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12-30-2009 08:58 PM  7 years agoPost 5
az_heliguy

rrKey Veteran

San Tan Valley, AZ

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you want it to run tight at first, but they will loosen up a little bit after a couple of flights.

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12-31-2009 01:45 PM  7 years agoPost 6
400driver

rrApprentice

uk/ Spain

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Thanks ..great info , all we need now is a video and you can be the new Finless!

More days at home would be nice!

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