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Author Topic: Compressing the two rings...  (Read 530 times)

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Offline mrcaptainbob

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Compressing the two rings...
« on: May 26, 2021, 10:47:30 PM »
 How can I compress the two rings to get the piston back in the cylinder? The automotive one I have is too large and unwieldy for the job. A hose clamp? I don't do this a lot.

Offline doc henderson

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Re: Compressing the two rings...
« Reply #1 on: May 26, 2021, 10:53:02 PM »
good idea.  they make them of course for small engines.  I have a couple but you are a ways away.  good luck.  I did it by hand when i was a kid on a 60 cc Yamaha.
timberking B 2000, 277c track loader, PJ 32 foot gooseneck, 1976 F700 state dump truck, JD 850 tractor.  2007 Chevy 3500HD dually, home built log splitter 18 horse 28 gpm with 5 inch cylinder and 32 inch split range with conveyor 12 volt tarp motor

Online Old Greenhorn

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Re: Compressing the two rings...
« Reply #2 on: May 26, 2021, 11:13:12 PM »
Take a plastic coffee can and cut it open and make a 2" wide strip, wrap it around the rings and put a hose clamp on it near the base, then with a block of wood drive the piston into the cylinder with a soft mallet. 
 Usually I can get small rings into the cylinder with my finger nails alone, but it is funny to watch and you shouldn't really have children present when I do it. :D :D
Tom Lindtveit, Woodsman Forest Products
Oscar 328 Band Mill, Husky 450, 372 (Clone), Mule 3010, and too many hand tools. :) Retired and trying to make a living to stay that way. NYLT Certified.
OK, maybe I am the woodcutter now.
I can work with wood, but I am NOT a Woodworker, yet.

Offline doc henderson

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Re: Compressing the two rings...
« Reply #3 on: May 27, 2021, 12:26:48 AM »
If children are present, safety first!.  always have them use hearing protection and cover their eyes if @Old Greenhorn is doin something tedious!   :D :D :D ;D ;D ;D  If not, they say it is good to learn sign language, and know a foreign language. :o :o :o
timberking B 2000, 277c track loader, PJ 32 foot gooseneck, 1976 F700 state dump truck, JD 850 tractor.  2007 Chevy 3500HD dually, home built log splitter 18 horse 28 gpm with 5 inch cylinder and 32 inch split range with conveyor 12 volt tarp motor

Offline Real1shepherd

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Re: Compressing the two rings...
« Reply #4 on: May 27, 2021, 10:42:28 AM »
ebay, Bailey's and a lot of places are awash with little plastic 'helper' ring compression kits for chainsaws. Not much money as they're all plastic.

Maybe try one of our sponsors.

Kevin

Offline sawguy21

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Re: Compressing the two rings...
« Reply #5 on: May 27, 2021, 11:34:53 AM »
I use a worm drive hose clamp, not as quick as the plastic ones but works and is readily available.
old age and treachery will always overcome youth and enthusiasm

Offline sablatnic

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Re: Compressing the two rings...
« Reply #6 on: May 29, 2021, 05:43:53 AM »
I normally use piece of a steel packing strap. 

Offline Al_Smith

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Re: Compressing the two rings...
« Reply #7 on: May 29, 2021, 07:15:41 AM »
The cylinder should have a chamfer on the bottom .Oil everything up and if you hold your mouth just right the piston will slip right in .Joking aside that's how I do it .If the piston has pins make sure the ring gap is on them else you couldn't beat it in with a big .hammer .
The key to it is oil .Don't use wd-40 or something. Regular old crankcase oil ,brand makes no difference .If it doesn't blow smoke for a couple of minutes on a start up you didn't use enough .

Offline old guy

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Re: Compressing the two rings...
« Reply #8 on: May 30, 2021, 10:48:24 PM »
If your not using those little red ring compressors, your doing it the hard way.

Offline Tacotodd

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Re: Compressing the two rings...
« Reply #9 on: May 31, 2021, 03:59:28 AM »
I donít know if itís been mentioned or not, but a soda or beer can thatís been slit to where itís only the thin part left (no rolled & thick parts) would be easily manipulated and removed when you want to remove the can. Just wrap it around the piston and rings and youíre there. Bass-bing bada-boom, done. Seat the cylinder and continue with the re assembly. Easy to trim the can to fit, if itís to much can (2Ēx4Ē should be plenty)  it can easily be trimmed with scissors. Itís slightly hard on the scissors, so have a dedicated pair for the less than precision use such as this. Sheet metal shears or tin snips or even cheap aviation snips that Iíve sold in a three pack of different curvatures for about $25 would be spectacular ;) Just donít use the best ones in the house! A better half thatís OCD might, ahem, complain when they no longer cut like they did.

Full disclosure, Iím the one in our marriage that gets OCD. But I donít believe in trashing what you have either   :o My wife will disagree, but thatís why I want high quality stuff from the begging. Cry once at purchase, not every time you use or break, & then have to purchase again!
Trying harder everyday.

Offline Fishnuts2

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Re: Compressing the two rings...
« Reply #10 on: May 31, 2021, 09:31:57 AM »
You'll pat yourself on the back after you buy one of those Husqvarna branded ring compressors.  I even give them as gifts once in awhile.
They're around $10 and also come with 2 plastic piston stops and a piece to hold the piston stable while installing the rings.

Offline Al_Smith

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Re: Compressing the two rings...
« Reply #11 on: May 31, 2021, 10:36:27 AM »
I think too many people are painting with a very broad brush .It's one thing on a chainsaw with a removable cylinder and entirely another on a clam shell or for example a reed valve McCulloch . What ever floats your boat though . ;D Saying that I've never used a ring compressor on any small engine and I've worked on a lot of them .
Now on an old diesel like a Caterpillar with 3 or 4 compression rings and two oil rings that's entirely another  subject .Big thick rings almost impossible without a compressor . On those I have compressors I think up to 5 or 6 inch .

Offline Mad Professor

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Re: Compressing the two rings...
« Reply #12 on: June 01, 2021, 12:26:09 PM »
Make a piston holder from a piece of 1" scrap.  Lube up the cylinder/rings and get the crown started, then I make a tool from an old toothbrush to work the rings in along with your fingers.  Things go much easier with the piston support. I'd avoid any hose clamps as the steel can mar the piston.



 



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