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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › need a second opinion
04-22-2009 04:26 PM  9 years agoPost 1
synodontis

rrKey Veteran

United Kingdom

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my old YS 90 has had over 100 flights and I decided to do routine maintenance on it. Discovered I had to replace the back bearing but in the process of taking the piston sleeve out I had to leverage the piston causing a piece of it to crack off as shown in the photos below:




what I need to know is if I can still use this piston or is it best I replace it?

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04-22-2009 04:51 PM  9 years agoPost 2
ErichF

rrElite Veteran

Sutton, NH

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I'm thinking it can be blended with a small jewler's file and continue to be used. Blend the area so that there are no sharp edges or corners from which a crack can develop.

Make sure that the ring groove hasn't been crushed, which can cause the ring to stick. If that's the case, then bin the piston and get a new one.

Erich

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04-22-2009 05:05 PM  9 years agoPost 3
flyboy907

rrVeteran

woodstock, ga

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^^^^^^^^^I agree, file it smooth and check ring land, the ring is what produces the compression so if you can smooth it out and land is ok put a new ring on it and run it!

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04-22-2009 05:07 PM  9 years agoPost 4
Auto180_OCMA

rrApprentice

Futaba City Z (Mobara)

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Go with ErichF susgestion and thje one below
I ve done it it works

AMA 334000

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04-22-2009 05:09 PM  9 years agoPost 5
synodontis

rrKey Veteran

United Kingdom

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thanks to all, I'll give it a try.

really, I'm p*ssed off that I almost ruined a piston in the process of just opening an engine and taking a sleeve out!!! The sleeve is such a tight fit I want to sand the hole where it slides in!!

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04-22-2009 05:28 PM  9 years agoPost 6
airdodger

rrElite Veteran

Johnston USA

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The bottom skirt is worn and you have been running slightly too hot. Now that you have stressed the piston crown other pieces may break off. I would use a new piston. You should just heat the case with a heat gun and the liner will slip out easier, after it's heated use a piece of wood inserted through the port and twist the crank it will pop up. You might want to use a new ring too if the gap is wide.

Chris

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04-22-2009 05:36 PM  9 years agoPost 7
synodontis

rrKey Veteran

United Kingdom

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yes, it was my fault, and it was mainly down to inexperience too. I've never had such a tight fitting sleeve on an engine before!

the gap is fine, I'll see how this poston fares after the filing. I wasn't aware that I was running slightly too hot since I always feel the backplate of my engine after a flight to make sure that it wasn't too hot, I hardly ever stress my engines at all with what I do.

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04-22-2009 08:48 PM  9 years agoPost 8
AaronJohnson

rrElite Veteran

mason,MI

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I would replace that piston. I would not run any piston with ring land damage. I also agree with the poster that stated the shirt looks worn. If a piece breaks off that piston you will have more damage then you do now.

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04-23-2009 02:55 PM  9 years agoPost 9
Kevin Dalrymple

rrKey Veteran

Indianapolis

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Replace the piston! I didn't when i had that same problem and the piston let go on spool up. It trashed the rear bearing and shot debree through out the case.

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04-23-2009 03:34 PM  9 years agoPost 10
rckrzy1

rrElite Veteran

Hurst Texas

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I'd be worried about that crack where the con rod goes, man if it breaks the engine will be a gonner.



Wildcat Fuels

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04-23-2009 04:36 PM  9 years agoPost 11
devious17

rrApprentice

Malaysia

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If you are familiar with autorotation and can handle one in time of need I would use that piston until it can no longer be used.

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04-24-2009 02:48 AM  9 years agoPost 12
Chris.C

rrVeteran

Hong Kong

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YS has much tighter fit between the piston and sleeve so it would be better to replace that piston.

If you need to heat it up to take out the sleeve, the engine is likely to have lean run too.

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04-24-2009 05:19 AM  9 years agoPost 13
tasmanian devil

rrApprentice

DeSoto,Tx.

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New piston and ring.

I do'nt crash,I just rearrange parts.

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