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HomeAircraftHelicopterThunder TigerOther › very bad engine misalignment.
02-11-2006 07:28 AM  12 years agoPost 1
Branzzz

rrVeteran

Singapore

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today after putting the new tj sensor in on my hpyer 50, the clutch seemed to rub against the top of the clutch bell the more i tighten the mounting screws by the side. i took the engine out again, and madesure the fan and clutch were secure, but the more i tighten, the more the clutch rubs.

what can i do? its rubbing to the point where the engine will never idle.

Raptor 50V2
OS 50SX-Hyper
GY502/9253
Hitec 6975
Airtronics ERG-VB
JR 3810

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02-11-2006 09:43 AM  12 years agoPost 2
Peefor

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Norfolk UK

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Either the clutch is too high, or the bell is too low.
The usual cause is the the clutch is too high. This can be caused by the fan not being tightened correctly onto the crankshaft, or the crankshaft washer has been left on. The latter is the easiest to deal with.

This picture shows the proper tools, but some get by by using other means, which you might be lucky with. When screwing the fan on, NEVER stop the engine from rotating by sticking something down the glow-plug hole, nor exhaust port, in most cases you just damage the piston.


Pete

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02-11-2006 11:45 AM  12 years agoPost 3
Branzzz

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Singapore

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its unlikely the clutch itself is too high because there's no slop and i can't tighten it down anymore... moreover, it only jams when i tighten the mounting screws. if they're not tight, it doesn't hit...

Raptor 50V2
OS 50SX-Hyper
GY502/9253
Hitec 6975
Airtronics ERG-VB
JR 3810

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02-11-2006 01:55 PM  12 years agoPost 4
RevGadget

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Decatur, Alabama

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I had that problem once. The cause was pinion/starter shaft had move down. Check that.


3D2me= One eye on the Tx, one on the Heli and my thumbs in between.

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02-11-2006 02:26 PM  12 years agoPost 5
BarracudaHockey

rrMaster

Jacksonville FL

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Branzzz did you by any chance install a washer between the fan and engine?

Also you can loosen the engine mount bolts, slide the engine in and put the screws that hold the mount to the frames in, then slowly turn the start shaft backwards while tightening the engine mount bolts, tighten each one a bit at a time, if you feel the start shaft start to drag back off that bolt and move to another one till they are all tight and the start shaft spins smoothly. You will then have achieved nearly perfect alignment.

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

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02-11-2006 02:36 PM  12 years agoPost 6
Branzzz

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Singapore

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weirdly i've never had this problem before. my raptor's gone through 12 gallons and about 2 years with out this ever...

Raptor 50V2
OS 50SX-Hyper
GY502/9253
Hitec 6975
Airtronics ERG-VB
JR 3810

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