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09-10-2006 07:22 AM  14 years ago
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Hawkboy

rrNovice

Canada

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Hawk pro starter noise
I'm having a problem with my new Hawk pro...Namely...When I place the hex driver into the drive cup and activate the starter I get this awful clacking sound on each revolution.

Ive taken the engine out and the clutch mechanism apart and re assembled it to specs, every thing turns smoothly...good compression and the engine turns with no clacking so no problems there. I managed to start the engine yesterday and it ran great but I still have this racket going on as I engage the starter and try to fire it up.

The two slots in the top of the fan are fine and the small tee bar is engaging in those slots without slipping out, but when I apply the starter the clacking noise comes back...I tried a regular starter and even tried using the hex end driver in 2 different drills and its still there.

Whats happening here...HELP ????
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09-10-2006 12:43 PM  14 years ago
SteveH

rrProfessor

Texas

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Hawkboy,

The Hawk/Falcon/Raven start system is noisier than helis with a torrington bearing start system, but the beauty of it is that once the engine starts, the shaft is totally disconnected from the drive system. You can reduce the noise to a minimum by making sure the alignment between the start system and the engine is optimised by loosening the engine mount to frame bolts, and engaging the start system, and getting the alignment as straight as possible while retightening the bolts.
The government cannot give you anything without first taking it from someone else.
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09-10-2006 05:28 PM  14 years ago
HeliAdict

rrApprentice

Texas

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💎Sustaining Member
What kind of starter are you using? If it tuens slow it will cause more noise than a high speed starter.
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09-10-2006 06:26 PM  14 years ago
MikeInMobile

rrElite Veteran

Mobile, Alabama

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The clacking noise means that the fan is not in perfect alignment with the start shaft. Loosen up the engine mount and remove the glow plug and turn the start coupling with the pin engaged. This will allow you to align the starter system.
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09-10-2006 06:49 PM  14 years ago
catzazz

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Vancouver Island, BC, Canada

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A start shaft with a One-way bearing will fix this problem too.

The clanking noise is generally being made from the start shaft hitting the sides of the start fan insert when the compression releases and increases. I also had this problem and fixed it with a One-way bearing start shaft.

It can get real bad with a 50 you can even break the fan if it kicks back too hard.

Cheers, Mark M,
http://www.pdqflyrs.com
Fly like you borrowed it!! Land like you stole it!! visit www.virc.ca
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09-11-2006 12:19 AM  14 years ago
Gearhead

rrMaster

Vt

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yes, a wand with a oneway bearing will help reduce the sound..

Jim
Jim
Buzz Buzz Buzz
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09-11-2006 04:10 AM  14 years ago
Hawkboy

rrNovice

Canada

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Many Thanks
for you all the prompt replys and helpful suggestions...you guys are the best
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09-11-2006 03:04 PM  14 years ago
TeamSlacker

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St. Cloud, MN

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mine got noisy when the set screws in the start shaft loosened up. They hadn't backed out far enuf to get around the 'flat' but was loose enuf to rattle like crazy.
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09-11-2006 11:13 PM  14 years ago
adamsz06

rrVeteran

Geilenkirchen Germany

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I know you probably already have, but check the set screws in the aluminum collar that limits the depth the start shaft can engage; mine had loosened a little on my Hawk and when the spring returned the shaft upward after starting, the collar moved down the shaft little by little until the "T" bar was barely engaging the fan. It sounded awful as the bar ran around the top of the fan...a good upgrade is a hardened hex adapter if you don't already have one, mine stripped after about 2 gallons.R.I.P. Roman
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09-12-2006 01:41 AM  14 years ago
RotorRage

rrVeteran

Lake Charles, La.

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you might try taking the glow plug out and spinning it with the starter just to see how smooth everything is turning without fighting the compression. Mine is a little noisy too but everything is tight and true. When i take the glow plug out and spin it over all i can hear is the engine spinning real smooth.A friend will bail you out of jail. A real friend sits with you in the cell saying"That was awe
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09-12-2006 03:51 AM  14 years ago
BC Don

rrElite Veteran

Calgary, AB Canada

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Try spinning it by hand (may need to remove the glow plug). By doing this and looking at the alignment between the fan and "T" start shaft you'll be able to see if the fan (and motor) are lined up properly.Got Money? Send it to me, I'm a Heli Addict.
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