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46cc piston ring 46cc 240353 538240353 - McCulloch Garden

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If you are unable to obtain the correct piston ring at the agents, measure the bore of the cylinder and the width and depth of the ring grooves in the piston and see if a lawnmower repair center can match up the rings for you.

Posted on Mar 17, 2011

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Posted on Jan 02, 2017

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Where is the piston o ring


The term "o-ring" usually is in reference to some sort of rubber or neoprene ring that serves as a gasket or seal for something. Pistons do not have o-rings, but they do have piston rings. There are usually three or more rings on each piston. They are split rings of steel that are inserted into grooves of the outer circumference of the piston. They seal the piston to the cylinder walls and prevent the air/fuel mix from getting past the piston into the crankcase and prevents the crankcase oil from being sucked into the cylinders. With the pistons rings, the cylinders would not have sufficient compression to do their job effectively. Rings can and do break from time to time. This can cause degradation of performance or in the worst-case scenarios, serious cylinder damage.



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Feb 14, 2016 | Cars & Trucks

1 Answer

My poulan pro 295 has very low compression what do i need to do to fix it


Its either seized, or the rings are worn, either way you need to remove the cylinder to see just what has happened, if there is scuffing on the exhaust side of the piston, it will require a new piston, if the cylinder wall will not clean up well enough it will need a cylinder as well, if there is no scuffing replace the piston ring,

Dec 15, 2013 | Poulan Pro Chain Saw 46cc 20"

1 Answer

Chainsaw wont start


If there is good clean fuel at the plug and there is a good spark it should at least fire, before doing too much more i would pull the muffler off and take a lookm at the piston through the open exhaust port, if there is signs of damage/scuffing it will need to come apart, as it will never run with bad piston damage.

Feb 26, 2012 | Poulan Pro Chain Saw 46cc 20"

2 Answers

Hello im having a problem repairing my pistons and rings on my motor bike. can you plz tell me if the piston rings are supose to spin all the way around or are they both ment to lock in the groves for them


howdy.if your bike is a two stroke the ring has a pin in the piston groove to stop the ring turning.on four strokes the ring gap should be off set to each other and generally placed between 20-25 past and 25-20 to [like a clock] but no where near the side of piston at little end pin.also use a little oil in grooves to lubricate while fitting rings.some rings have angled edges so check wether they go top or bottom directions in manual or packaging with new ring sets.most rings will be marked to guide you.have fun and good luck.cheers

Mar 21, 2011 | Yamaha DT 125 RE Motorcycles

1 Answer

When I pull the rope to start it the engine doesn't want to turn


Remove the spark plug and retry pulling the engine through. If it spits out a fair quantity of liquid fuel, you have a flooding condition in the carburetor--usually a defective lower chamber diaphragm. If it still wont turn, then suspect that the engine has been run on straight gasoline without admixed oil--bad news!!. If this is so, it will have ruined the cylinder, piston, and ring(s) at a minimum. Compare labor and new parts against another comparable saw. Hope this helps and good luck!

May 31, 2010 | Poulan Pro Chain Saw 46cc 20"

1 Answer

How do i remove piston pin from 375 poulan pro


ArboristSite Chainsaw thread (free to join)
http://www.arboristsite.com/forumdisplay.php?f=9
I suggest you look around the above site. Someone here has been where you are. You can join for free and they are a very helpful group of folk.

Apr 21, 2010 | Poulan Pro Chain Saw 46cc 20"

1 Answer

Poulan 18' model 2000 chain saw, quit running , will not start.


If you have a compression gauge, check the compression. Anything under 90psi is too low.

Check your flywheel key. If it is broken the flywheel will move and not fire at the correct time.

Note: if it does not sputter with carb cleaner then it's not your carb.

Next:
Remove your exhaust manifold. Look into the cylinder with a flash light. You are looking for scratches. Anything larger then a light fingernail is definite proof you need a new cylinder/piston assy.

If it passes that test do the following:

Pour mixed fuel straight into your cylinder until 1/4 full. Slowly pull your saw over while looking into the cylinder. If you see bubbles after the ring/rings go by then you need a new cylinder/piston assy. On rare occasions if no scratches are present on the cylinder wall or piston, you may be able to change just the rings.

Mar 31, 2009 | Poulan Pro Chain Saw 46cc 20"

2 Answers

46 cc Sears/Poulan chainsaw will not start


Four things I can think of:
1) There is a short in your spark plug wire. When you bend it to connect the plug in the machine it allows the exposed cable to contact the engine block. Examine the wire all the way to the coil.

2) Flywheel key is sheared ( you obviously know how to take off the flywheel since you checked the seals).

3) Flywheel air gap is not set correctly. Loosen the coil. Put the cover of a notebook or the cardboard piece of a cigarette pack between the magnetic portion of the flywheel and the coil. Tighten the coil down. This will get you the proper gap.

4) Your cylinder/piston or rings are scrubbed out. Even though it passed a compression test, on rare occasions it will loose compression only when it fires. So do the following:

Remove your exhaust manifold. Look into the cylinder with a flash light. You are looking for scratches. Anything larger then a light fingernail is definite proof you need a new cylinder/piston assy.

If it passes that test do the following:

Pour mixed fuel straight into your cylinder until 1/4 full. Slowly pull your saw over while looking into the cylinder. If you see bubbles after the ring/rings go by then you need a new cylinder/piston assy. On rare occasions if no scratches are present on the cylinder wall or piston, you may be able to change just the rings.

First if you can get a inline spark tester so you can see if your getting spark with the plug installed.

Mar 24, 2009 | Poulan Pro Chain Saw 46cc 20"

1 Answer

Poulan 3314 piston change, special tool needed???


Needle nose pliers. You would normally use a new lip when reinstalling it.

Mar 16, 2009 | Poulan Pro Chain Saw 46cc 20"

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