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HomeAircraftHelicopterThunder TigerOther › Raptor 70 Clutch Noise
03-29-2005 07:24 PM  13 years agoPost 1
gilliraldi

rrApprentice

Epsom, NH

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I notice when the engine is idling, there is a high pitched, grinding type noise that goes away when I spool up. I did have 1 hot start and I am thinking that it must be related to the clutch. I checked the clutch liner and it seems fine. I just can't figure out the source of this noise... Please help.

Hello, Peter. What's happening? We need to talk about your TPS reports

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03-29-2005 09:19 PM  13 years agoPost 2
Tek

rrVeteran

Yukon, OK USA

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How old is the heli... ie: amount of flights
Might be the start shaft.

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03-29-2005 09:22 PM  13 years agoPost 3
gilliraldi

rrApprentice

Epsom, NH

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It has about 30 flights on it. Could you explain why it might be the starter shaft? Thanks in advance for helping

Hello, Peter. What's happening? We need to talk about your TPS reports

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03-30-2005 05:09 AM  13 years agoPost 4
Tek

rrVeteran

Yukon, OK USA

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Starter shafts tend to vibrate and make high speed sounds. Also have you taken the engine out and checked the clutch?

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03-30-2005 01:43 PM  13 years agoPost 5
gilliraldi

rrApprentice

Epsom, NH

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Not yet - what should I look for? I did check the clutch liner and it seemed fine. What could have gone wrong with the clutch?

Hello, Peter. What's happening? We need to talk about your TPS reports

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03-30-2005 05:33 PM  13 years agoPost 6
Tek

rrVeteran

Yukon, OK USA

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How did you check the liner without taking out the engine? Your clutch could very well be cracked or broken.

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03-30-2005 05:35 PM  13 years agoPost 7
gilliraldi

rrApprentice

Epsom, NH

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No - I did not see anything wrong with the clutch. Sorry - I thought you were referring to some other problem that might not be visible....

Hello, Peter. What's happening? We need to talk about your TPS reports

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03-30-2005 05:44 PM  13 years agoPost 8
Tek

rrVeteran

Yukon, OK USA

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When the engine is idling put your finger on the hex coupler and see if it stops the noise.

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03-30-2005 06:00 PM  13 years agoPost 9
Linley

rrApprentice

Rockville Centre - LongIsland, New York

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Could be the One Way Bearing
Sounds like its the one-way bearing thats pressed into the clutch. Mine is doing the same thing, especially when the engine is cold when starting it. For me it goes away and so far hasn;t caused any problems yet.

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03-31-2005 04:26 AM  13 years agoPost 10
supertux1

rrNovice

Madison, WI

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Check the bearing that's on the pinion, then check the smaller one that's higher up on the start shaft. I had to replace both those
bearings twice in one year. Now they have super high quality Boca
bearings and no failures

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