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HelicopterEngines Plugs Mufflers Fuel › nick in piston?!
12-03-2011 01:41 AM  5 years agoPost 1
wifeorheli

rrElite Veteran

reno, nevada usa

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sup guys quick question im rebuilding a novarossi 57 i nicked the piston side while putting in wrist pin. Its not a gouge or even close. Its barely there only way to notice is if i run my tiny flathead across the outside you can barely feel it. its very small. Does the piston head itself rub the sleeve or just ring make contact? I dont want to ruin a brand new sleeve and ring. Maybe it will be fine its barely there im just stressin what you guys think?!?! thanx

Novarossi Motors U.S.A
www.PlanetHobby.com
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12-03-2011 03:29 AM  5 years agoPost 2
airdodger

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Johnston USA

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The ring makes contact, the piston should not contact the liner normally.

Chris

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12-03-2011 03:38 AM  5 years agoPost 3
TMoore

rrMaster

Cookeville, TN

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That engine has to be relatively new. A nick can be smoothed out if need be. How many gallons has it had through it?

TM

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12-03-2011 06:01 AM  5 years agoPost 4
wifeorheli

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reno, nevada usa

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this is a brand new piston sleeve ring set. I nicked it putting the wrist pin in. just enough to feel when a small screw driver drug acroos the survace. Its not deep or nothing very small. But im stressin just want thing to be ok

Novarossi Motors U.S.A
www.PlanetHobby.com
Team Align
GrandRc.com
ZRC U.S.A. "PushGlo, SwitchGlo"

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12-03-2011 02:05 PM  5 years agoPost 5
airdodger

rrElite Veteran

Johnston USA

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As long as the surface is not raised it will be ok.

Chris

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12-03-2011 06:49 PM  5 years agoPost 6
wifeorheli

rrElite Veteran

reno, nevada usa

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should i hit it with some like i dont know brillo pad?

Novarossi Motors U.S.A
www.PlanetHobby.com
Team Align
GrandRc.com
ZRC U.S.A. "PushGlo, SwitchGlo"

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12-04-2011 03:42 AM  5 years agoPost 7
helidevil

rrElite Veteran

Brunswick, ME

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file it smooth, give it a fuel bath and go for it. engine parts are dispensable i go through a 50 hyper about every 6 months, a little ding i wouldnt worry about too much

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12-04-2011 04:06 AM  5 years agoPost 8
rexxigpilot

rrProfessor

Florida

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The NR Rex57 uses a Dykes type ring which expands under combustion pressure to seal the cylinder. Damage to the piston top area where the ring seats and which causes the ring not to function/expand is a reason to replace the piston. Otherwise, file, sand or buff the high marks off and it will be fine. Flush away any metal particles with fuel.

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12-04-2011 11:20 PM  5 years agoPost 9
wifeorheli

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reno, nevada usa

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quick question not related. My other rex i think sucked so dirt in today had dirt in the inlet. Took apart but no signs of it. Sleeve doesnt seem to be scored up at all but how hard should it be to turn the motor over by hand with the fan? Mines not exremly hard but i dont rember what it felt like before. Can you guys hear air exscaping when slowly turning?

Novarossi Motors U.S.A
www.PlanetHobby.com
Team Align
GrandRc.com
ZRC U.S.A. "PushGlo, SwitchGlo"

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12-04-2011 11:31 PM  5 years agoPost 10
airdodger

rrElite Veteran

Johnston USA

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You took the engine completly apart and washed in fuel, right. Take the plug out the engine should turn easy, if not start looking.

Chris

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12-05-2011 11:02 PM  5 years agoPost 11
wifeorheli

rrElite Veteran

reno, nevada usa

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didnt wash it out and its a easy turn no score marks on sleeve or anything. i put some afterun oil in it and its got good compression so maybe its good ?

Novarossi Motors U.S.A
www.PlanetHobby.com
Team Align
GrandRc.com
ZRC U.S.A. "PushGlo, SwitchGlo"

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12-06-2011 03:07 PM  5 years agoPost 12
CF1

rrApprentice

Olympia, WA

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I had that happen on one of my OS 50s. I buffed the area and called it good.

Chris

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HelicopterEngines Plugs Mufflers Fuel › nick in piston?!
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