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HelicopterMain Discussion › Engine question
03-12-2003 09:54 AM  14 years agoPost 1
Jamovich

rrVeteran

Bangalore, India

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Ok I want to replace the fan on my O.S. .32 SX engine..which was preinstalled at the factory (Nexus). I can get the main nut off..it took gigantic strength...now the problem is the fan won't slip off the shaft...no amount of strength can budge it. What must I do to remove this annoyin piece of plastic? Btw there is an aluminium thingie on top which the clutch plates mount on.

Secondly...in my attempt to remove this thing...i disassembled the engine entirely as to prevent any shock from damaging the conrod. Since this is a ringed piston...how do I put the sleeve back on it when I mount the piston back inside the engine (the conrod cannot be connected back unless he piston has enough play so I cannot mount the piston inside the sleeve...piston must go in first.then the sleeve)? The ring has alot of tension..and it won't fit inside the sleeve unless something is pressing them together...with the piston inside the surrounding engine closure I won't be able to squeeze on it to put the sleeve over it.

Any suggestions would be helpful!!

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03-12-2003 10:15 AM  14 years agoPost 2
FinnDave

rrElite Veteran

Kouvola, Finland

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STOP!! Don't try to pull the fan off the shaft, you must unscrew it! It is threaded, you need to lock the engine (taking the carb off and using some hard plastic to lock the crankshaft if the favourite, I use a toothbrush), then unscrew the fan.

David S., Kouvola, Finland

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03-12-2003 10:24 AM  14 years agoPost 3
Jamovich

rrVeteran

Bangalore, India

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Ok

It is DAMN AND IMPOSSIBLY tight! Any way to loosen its grip without using an elephant? Also does it unscrew the same way as the nut? (Counter?)

Thanks

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03-12-2003 10:52 AM  14 years agoPost 4
FinnDave

rrElite Veteran

Kouvola, Finland

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Try some heat on the crankshaft, but careful you don't melt the fan. If you do need an elephant, I guess you have a better of finding one than I do

David S., Kouvola, Finland

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03-12-2003 11:19 AM  14 years agoPost 5
Jamovich

rrVeteran

Bangalore, India

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i'll try that

good thing the replacement will be the turbofan II from helimax =)

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HelicopterMain Discussion › Engine question
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