How to get piston and ring back in cylinder - HobbyTalk
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post #1 of 20 (permalink) Old 01-17-2012, 11:04 PM Thread Starter
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How to get piston and ring back in cylinder

How do you guys get a piston with rings back in a cylinder. I've had moderate success using fingers and screwdrivers but looking for some suggestions.

My grandson (11 years old) and I (much older) have torn down a trimmer engine just for the learning experience for him. It was a running motor that I picked up for $1.00--Solo brand. We're talking about the function of the parts and how a 2-cycle engine works. We will put it back together and hope to get it to run again. It would be very difficult, if not impossible, to find a replacement ring, so I'm hoping we don't break it.

How's the best way to get the piston back in the cylinder? I have compression sleeves for bigger engines, but nothing this small. I work on a lot of trimmers, but seldom pull the piston with the intent to put it back together.

Thanks for your help.
Glynn
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post #2 of 20 (permalink) Old 01-18-2012, 06:52 AM
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How about a hose clamp.
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post #3 of 20 (permalink) Old 01-18-2012, 07:01 AM
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get a heater hose clamp...screw type...sand the inside with 600 grit paper ...

better way...go to a motorcycle shop and order a piston ring compression tool...for 50cc or so...looks like a pair of plyers with 2 semicircle on the ends...
I own several.
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post #4 of 20 (permalink) Old 01-18-2012, 11:01 AM
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All the cheap two cycles I've worked on had removable cylinders and the piston came out the bottom.The cylinders have a taper on the bottom and with a little oil on the piston and ring,using one finger as a compressor,they slid right in with no damage or cussing.Removing a ring without breaking it from a scored on carboned piston is the hard part.If replacing the piston,the ring gap side with the pin faces the exhaust port.Just my opinion,hope this helps.
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post #5 of 20 (permalink) Old 01-18-2012, 11:42 AM
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Agree with Grunt, oil it up, the cly is tapered in 99% of the time, it should go in fairly easy using just your fingers, I my self wouldn't use a clamp or screw driver as both may damage the ring surface, just make sure the gap in the rings stay located on the pin, otherwise they will spin on the piston and get caught on one of the ports
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post #6 of 20 (permalink) Old 01-18-2012, 10:46 PM Thread Starter
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Thanks guys for your answers. This is a trimmer engine with piston coming out (and going back in) the bottom of the cylinder. I know the risk of removing the ring and putting it back on so we are not going to do that. This is a very clean engine, with apparent very little run time, but we are just doing this as a learning project for my grandson (and maybe a little for me also). The fun part will be getting it to run again.

Just for fun, I'll make a final post after we have it back together. I'm really proud of this little guy--he's been starting and running blowers and trimmers for several years (remember he's only 11), and can operate my 61" Scag zero turn as good as I can.
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post #7 of 20 (permalink) Old 01-19-2012, 11:12 AM
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Thumbs up

GlynnC,I think it's great that your taking your knowledge and his enthusiasm to save machines that would normally be thrown away when they stop working.The satisfaction of saying "I fixed that" is priceless.Even if his career path turns out to be a brain surgeon,he will always remember that Grandpa taught him how to fix things.Good for you!
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post #8 of 20 (permalink) Old 01-20-2012, 02:02 PM
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Quote:
Originally Posted by usmcgrunt View Post
all the cheap two cycles i've worked on had removable cylinders and the piston came out the bottom.the cylinders have a taper on the bottom and with a little oil on the piston and ring,using one finger as a compressor,they slid right in with no damage or cussing.removing a ring without breaking it from a scored on carboned piston is the hard part.if replacing the piston,the ring gap side with the pin faces the exhaust port.just my opinion,hope this helps.
ring gap side with pin faces exhaust ? Are you shore as it would catch the port sounds like piston fitted backwards arrow points to exhaust no ring gap on that side of the piston

bill
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post #9 of 20 (permalink) Old 01-20-2012, 02:50 PM
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You are correct arrow towards exhaust port
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post #10 of 20 (permalink) Old 01-20-2012, 08:49 PM
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I apologize and stand corrected!
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post #11 of 20 (permalink) Old 01-22-2012, 12:53 PM
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rings

The only thing that should stop you from getting it to slide into the cyl is not having the ring pin lined up. On two cycles there is a alignment pin in the ring land to keep the ring from turning in the land unlike four cycles. Make sure that this small pin is lined up with the ring end gap before installing and that it stays lined up while installing. Doing this and oil and fingers will do it easily.
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post #12 of 20 (permalink) Old 01-22-2012, 04:53 PM Thread Starter
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Again thanks guys for your help--tomorrow afternoon is another "small engine clinic" time with my grandson. He's really interested in this, and this makes his "pawpaw" really interested also. One of the fun things about being a grandparent is making special memories with the grandkids!
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post #13 of 20 (permalink) Old 01-23-2012, 08:35 PM
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splitter

I have a Ryobi electric log splitter and it is very loud. Does anyone know if this is normal. Model # RY49701
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post #14 of 20 (permalink) Old 01-26-2012, 12:13 PM
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Originally Posted by buy*david View Post
I have a Ryobi electric log splitter and it is very loud. Does anyone know if this is normal. Model # RY49701
I have never used one of these,so I don't know how loud they are supposed to be.Hydraulic equipment will get louder if the oil level is low or there is air in the system and needs to be bled out.You will get more opinions if you start a new thread with your problem.No one will see your request buried in a two cycle cylinder question.Hope this helps.
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post #15 of 20 (permalink) Old 01-26-2012, 02:38 PM
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Thanks Grunt

Hey Grunt, I did post it in general but no response either. The good news is I tore it down and found a bad bearing. $13 and it's running good and quite. Thanks for the help.
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