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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › engine inspection YS 60SR
04-25-2014 11:30 PM  6 years ago
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joecass

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NJ

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engine inspection YS 60SR
I got 17 gallons of fuel on this engine and my oneway bearing in the clutch locked up. so I pulled the engine apart when it was out of my titan X50. I have been putting a OS 8 plug in it every 4 gallons even when it was new. can you guy take a look at these pictures and tell me what I should replace and if it looks like the engine was running lean.

the rear bearing as some rust on it but is very smooth.

there seems to be some where on the piston by the exhaust port just below the ring

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04-25-2014 11:40 PM  6 years ago
rudyy

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Just replace the front and rear bearings since you have taken the engine apart.
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04-26-2014 12:07 AM  6 years ago
joecass

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you think the pistion is ok? it has wear spot on it by the exhaust port
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04-26-2014 12:48 AM  6 years ago
Einzelganger

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Campbell, Texas

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Piston should be fine.
The ring makes all the contact anyway.
I don't really know what lean run damage looks like. I always run my engines rich.
I bet that X50 has awesome power with this engine.

Wayne
I love the smell of nitro in the morning.
RIP Roman
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04-26-2014 04:27 AM  6 years ago
joecass

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thanks guys. the YS 60 in the X50 is a beast.
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04-26-2014 04:53 AM  6 years ago
ICUR1-2

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Ottawa, Ontario

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I am unsure about YS piston rings but he OS rings turn silver from black when run lean.
I would change the bearings too since there is so much rust.

A good habit to get into,. run the engine dry of fuel and fill the tank before storing.
spending time, paying attention
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04-26-2014 10:11 AM  6 years ago
joecass

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the ring has a little spot that is just starting to turn silver were the exhaust port is.

dose this mean im lean? or is it normal wear from a engine with 17 gallons of fuel thought it?
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04-26-2014 11:55 AM  6 years ago
JuanRodriguez

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The Villages, Florida

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Looks to me like normal wear.... if you have been running the engine lean, you would know it by evidence of damage to the piston and corresponding scoring of the liner in the area of the exhaust port.

Some rust on the bearing outer race is not uncommon.....

I would just put things back together and run it....
Been there, done that and old enough to know better.....
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04-26-2014 12:44 PM  6 years ago
joecass

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ok thanks guys
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04-26-2014 03:35 PM  6 years ago
joecass

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i installed new bearings and ring. i was thinking about putting the engine in the oven on 180 degrees and retorque the head bolts.

i don't have the carb. on it so that should be ok?
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04-26-2014 04:41 PM  6 years ago
hyflyr

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Baton Rouge, LA

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The ring looked fine. I would not have replaced it. It takes a while to seat a YS ring and unless it is shiny it is good to go. The wear you reported on the exhaust port is totally normal as that little divider on the exhaust port is directly in the flow of the exhaust gases and gets very hot. This causes that part of the ring to wear in short order. Nothing can be done to stop that. As long as the ring is free to float in the ring groove you are wasting a good ring. The new ring will have to be broken in as if the engine is new. That is a waste of fuel.Scott
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04-26-2014 05:03 PM  6 years ago
joecass

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i can still take out the ring. what about using the oven on 180 degrees and retorque the head bolts. is this ok to do? i don't have the carb on it.
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04-26-2014 05:13 PM  6 years ago
hyflyr

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Baton Rouge, LA

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I have never heated the engine to torque the head bolts. I use a special torque wrench and let it go. Is the ring stuck in the groove and not free? Two things will cause this. One is carbon build up and the other is the groove is compressed. Rarely does the groove get compressed unless the piston crown is over stressed. The crown did look somewhat pitted but I wasn't sure if it was just the way the picture came out. I would carefully heat the piston/ring assembly and see if it will work its way loose. Removing the ring is a tricky process to keep from cracking it. Take your time and slowly work one end around the circumference of the piston. Also don't flip it over when you put it back on. I will use a piece of wet/dry 600 grit folded over an exacto blade to clean the ring groove of any buildup. What fuel are you using?Scott
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04-26-2014 05:28 PM  6 years ago
joecass

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the ring is not stuck it only has a little spot on it that is silver by exhaust port. you said that is normal because it is so hot over there. i think im going to put the old ring in it. the only thing is that i put a light cross hatch on the cylinder with 600 grit sand paper.

i like to torque the head bolts when the engine is worm because they loosen up after a running the engine. like when i took this engine apart 2 bolts were loose.
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04-28-2014 01:59 AM  6 years ago
joecass

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im going to put a new one way needle bearing in my clutch. can I heat upthe clutch in the oven to install the one way bearing
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04-28-2014 02:23 AM  6 years ago
hyflyr

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Baton Rouge, LA

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The the one way bearing should be fine. I would not heat the clutch in the oven. It will change.the properties of.the clutch and do.more harm than good. I doubt that bearing is bad. It's only purpose is to allow the engine to.start.Scott
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04-28-2014 02:45 AM  6 years ago
joecass

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ok thanks

the bearing is no good all the needles fell out of it. that is why I pulled the motor in the first place
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04-28-2014 02:51 AM  6 years ago
Santiago P

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Dayton

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Hi there,

It is hard to tell from the piston photo but if you see tiny pin-hammer like marks on the piston face, your engine is detonating or pre-igniting.

This is an issue of running too much compression for the nitro content and glow plug temperature. The YS91s long stroke was notorious for this when used with WC Curtis 30 fuel and OS #8 or Enya 3 plug. Still made lots of power but did not run smooth.
A change to a Enya 4 plug, or lower nitro fixes the issue.

You could also try adding a .002 to .004" shim (gasket) to the head, but that a last resort.

S
Team Minicopter - PeakAircraft.com
FUTABA.USA - Team Kontronik - Scorpion Motors-
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04-28-2014 04:03 AM  6 years ago
joecass

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there is no tiny pin-hammer like marks on the piston face. im using rotor rage 30 and a OS 8 plug
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04-28-2014 04:28 AM  6 years ago
Santiago P

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Dayton

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Like I said, is hard to tell from the photo, I guess is just combustion marks.
You should be golden

The rear bearing will get loud when is time to change it. I just do it evey season, or put a center glide bearing and forget about it.

S
Team Minicopter - PeakAircraft.com
FUTABA.USA - Team Kontronik - Scorpion Motors-
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