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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › Replacing the cylinder liner or not
12-24-2014 01:55 PM  5 years ago
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rudyy

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E. Amherst, NY

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Replacing the cylinder liner or not
I am replacing the YS56 engine bearings. After taking everything apart, I notice that are some hairline scratches on the liner. The scratches are not deep but I can still feel them with my finger nail.

Engine has lots of compression when I turn the crankshaft by hand and I do not have any problem in starting the engine. Should I leave it as it is?
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12-24-2014 02:04 PM  5 years ago
balsapro

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Gallatin,TN

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Hard to say without seeing it.... but if it's not to bad and you are going to replace the ring you can hone the liner otherwise I'd just let it be.

I've seen these engines take a lot of abuse.
Build the Best, Fly the Best, Crash the Best
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12-24-2014 02:16 PM  5 years ago
Jerry K

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Houston Area

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You probably do not have a cylinder hone so take a piece of scotchbrite and chuck it up in a drill and run that. There are diffenent grades of scotchbtite. And keep the drill running when you finish up and you exit the cylinder.
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12-24-2014 03:15 PM  5 years ago
wjvail

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Meridian, Mississippi

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How much time do you have on the engine? Is this the first bearing you've put in the engine?

Simply wearing out a liner is very rare and unless you have many gallons of fuel through it or have abused the engine (run hot or lean), it is unlikely you need a new liner. What does the piston and ring look like?

You not just looking at the factory cross hatching are you?

Without knowing more I'd say leave it as it is.

Bill
"Well, nothing bad can happen now."
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12-24-2014 03:26 PM  5 years ago
rudyy

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E. Amherst, NY

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Engine has over 100 flights. Yes, the piston also has scortch on the surface. I am going to replace the piston and ring, but just wonder if I can leave the liner.
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12-24-2014 08:32 PM  5 years ago
airdodger

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Johnston USA

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If running fine leave alone. If you want a new engine replace the liner. The hone job is for one ring break in only.Chris
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