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HelicopterAlignT-REX 600N › Got a noise and cant find the problem
01-11-2011 02:00 AM  7 years agoPost 1
flynbryan

rrApprentice

Long Island N.Y.

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I have this nasty rattling noise comming from the engine or the clutch area. I've had it appart 3 times and can't find any signs of play or making material. I took it out the other day in 30 degree weather and it seemed to go away when it's spooled up. Could it be too much clearance between the clutch and the liner? When I idle down, the head will come to a stop. And I have quite a few flights on it sounding like this. The clutch is about the only part I can think of that would make a noise like that and still work and not show any real damage.. UUGGH!!

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01-11-2011 02:41 AM  7 years agoPost 2
Ladymagic

rrKey Veteran

South Korea

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I don't think it that it's a clearance issue from the clutch liner. If it were that, I don't think you'd hear a noise, it would just take longer for your head to engage. If there's a clanging metal sound coming from that area it could be that your clutch doesn't have enough clearance from the top of the bell. Look at the top of your clutch and your clutch bell for rubbing and if you seen any wear or any metal shavings, try adjusting your engine down a few mm's and if it's your clutch, that sound should go away. Also check that the nut on the engine shaft hasn't come loose and that washer underneath the whole stack in installed. That may also eliviate your head rotation problem. Another shot in the dark would be your one-way bearing on your clutch stack or your main rotor too. I'd have a look there too. Any way you look at it, it sound's like a simple and cheap problem to fix. Good luck and let us know how it goes.

Mellisa

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01-11-2011 10:14 AM  7 years agoPost 3
flynbryan

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Long Island N.Y.

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I checked all that you mentioned last time appart and no tell tales. I'm going to keep flying it what else can I do?

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01-11-2011 02:39 PM  7 years agoPost 4
BarracudaHockey

rrMaster

Jacksonville FL

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Engine bearings?

Andy
AMA 77227
http://www.jaxrc.com

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01-11-2011 03:18 PM  7 years agoPost 5
trekrider586

rrVeteran

Sylacauga,Al

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I would have a look at the clutch stack bearings,or possibily the nut off the pinion in the clutch/starter shaft bearing box.take the assembly out,take it apart and feel of all three bearings.the one in the clutch bell,the one on the pinion,and the one in the top.Replace any rough or notchy bearings,even slightly rough.A rough bearing at speed will make all kind of noise.
also check your engine bearings as well.

it's better to ask for forgiveness than for permission

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01-11-2011 03:39 PM  7 years agoPost 6
Heli 770

rrProfessor

USA.

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Loose baffle in the pipe?

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01-11-2011 04:18 PM  7 years agoPost 7
BarracudaHockey

rrMaster

Jacksonville FL

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Excellent! I had one drive me nuts, replaced engine bearings and tore down the clutch but I found a loose baffle in the muffler.

Andy
AMA 77227
http://www.jaxrc.com

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01-11-2011 08:37 PM  7 years agoPost 8
jschenck

rrProfessor

La Vista, NE.

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I've seen the pinion bearing go out on the 600 and cause this noise as well as the loose baffle and engine bearing.
Cam you wobble the clutch bell or pinion sideways? Also look for debris around the pinion/bearing area.

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01-11-2011 11:19 PM  7 years agoPost 9
flynbryan

rrApprentice

Long Island N.Y.

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The engine rolls over nicely with no grinding or excess play. I have had the clutch assembly appart completely. No shavings no signs of wear not a thing that would raise a red flag. The muffler I'm not sure about. I will have to check that out. I will report back. Thanks

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01-12-2011 12:28 PM  7 years agoPost 10
flynbryan

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Long Island N.Y.

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Getting about 14 inches of snow today so it will be a while before I can get a chance to test the muffler theory..

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01-12-2011 01:29 PM  7 years agoPost 11
BarracudaHockey

rrMaster

Jacksonville FL

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Just pop the muffler off and shake it.

As for the engine bearings, if the engine is idling you will be able to hear if its the bearings. Turning it over by hand wont tell you anything.

Andy
AMA 77227
http://www.jaxrc.com

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01-12-2011 04:04 PM  7 years agoPost 12
Four Stroker

rrElite Veteran

Atlanta

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Does this noise stop when you hit throttle hold while hovering near you ? Then it would be something between the engine and the one-way on the main shaft (provided that it isn't the muffler).

I have a four stroke and a three baffle muffler. The gear noise is louder than my engine and could be described as a rattle. I intend to check this out this spring. There ain't that many parts between the engine and the main shaft. The only thing that I have found is that the one-way in the clutch feels crunchy. I took the start shaft out and put it in the clutch and it still feels crunchy. I tried a new shaft and a new clutch and they also feel crunchy. I suspect that the bearing is pressed into a hole too small. Also, the one-way on the main shaft does not have anything above and below to align it - bushings or radial bearings.

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01-13-2011 05:51 PM  7 years agoPost 13
Simmer

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Massachusetts

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OS 50 ? 55? engine bearings is my guess. Horrible racket!

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01-14-2011 02:35 AM  7 years agoPost 14
flynbryan

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Long Island N.Y.

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I've been in this for 30+ years. You can tell when engine bearings are gone. You can hear it when you roll it over. This engine makes no noise what so ever. smooth as glass. Still have too much snow on the ground to test the muffler theory. But I'm convinced that it is not engine noise. This engine has only seen 20% for a gallons worth and then back to 15%. So pissed. I always find the problem though. Just a matter of time.

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01-14-2011 02:44 AM  7 years agoPost 15
Simmer

rrElite Veteran

Massachusetts

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Okay fair enough.... just a few gallons probably not an engine bearing. Mine went after 2.5 years. I do know of one engine at our field that went after just a couple months. Also this bearing if it was that might be masked by cold weather. Other places to look... fan shroud or muffler baffle. Swap the muffler to test that.

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01-14-2011 03:21 AM  7 years agoPost 16
BarracudaHockey

rrMaster

Jacksonville FL

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Only thing you need to do to check the muffler baffle is pull the muffler and give it a good shake.

Andy
AMA 77227
http://www.jaxrc.com

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01-14-2011 03:27 AM  7 years agoPost 17
Heli 770

rrProfessor

USA.

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I am thinking if it is a baffle it may not be completely loose, so a good shake might not do it.

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01-14-2011 03:39 AM  7 years agoPost 18
HiroboFreak

rrVeteran

Central Coast, NSW, Australia

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This may be a long shot.... is the governor sensor hitting the clutch bell/magnet? (Assuming you have a governor fitted)

T-rex700n VBar 5.3 Pro | T-rex700e DFC VBar 5.3 Pro | JR DSX9
Team RCBits | Team Lynx

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01-14-2011 03:55 PM  7 years agoPost 19
Four Stroker

rrElite Veteran

Atlanta

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If he can hear the "rattle" over the engine, it's not a little thing. The last rattle that I heard was indeed a rear engine bearing.

If this is a loud rattle, it has to be a bearing somewhere. Have you looked in the tail boom to see if the torque tube bearing is still in the rubber thing ? Is this rattle a metalic ping or a plastic rumble ?

Bang the muffler on your workbench and see if you hear anything.

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01-15-2011 03:24 PM  7 years agoPost 20
flynbryan

rrApprentice

Long Island N.Y.

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What I'm going to do is take video and post it. Then I will disassemble it and post that as well. How many flights do you think you can get with a bad bearing? I have many. (simply because I can't find the trouble). I build automated production line equiptment for a living so I have lots of experience with machines. For me not to be able to find this problem is mind-boggling. I'm gonna WIN! (at some point)

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HelicopterAlignT-REX 600N › Got a noise and cant find the problem
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