Author Topic: p 41 flywheel  (Read 816 times)

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Offline Bob

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p 41 flywheel
« on: June 03, 2014, 09:36:01 am »
Hi cannot get the flywheel off the saw tried a puller and tapping & prying with a hammer it will not budge. Leary of using air tools do not to damage the crank.
Any suggestions
Thank You

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Offline Warped5

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Re: p 41 flywheel
« Reply #1 on: June 03, 2014, 09:40:52 am »
Hi Bob - I'd try some penetrating oil around the crank after installing a puller with light pressure.  Come back the next day and apply a little heat to the flywheel right around the crank and tap the end.  Be sure to use a spare nut on the crank end so you don't booger the crank threads.

Offline KilliansRedLeo

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Re: p 41 flywheel
« Reply #2 on: June 03, 2014, 09:42:30 am »
+1 on the oil and heat!
"When the people fear the government...you have tyranny....When the government fears the people....you have liberty"

Thomas Jefferson
1743-1826

Offline Bob

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Re: p 41 flywheel
« Reply #3 on: June 03, 2014, 09:50:26 am »
Thank You
I soaked with pen oil last night and left the puller on I will try the heat today.
Thanks again

Offline fossil

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Re: p 41 flywheel
« Reply #4 on: June 03, 2014, 10:03:46 am »
Those are well known to stick. I had a heck of a time with mine. I left the puller on under tension for about two weeks and it popped right off with a smack.
Tim

Offline KilliansRedLeo

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Re: p 41 flywheel
« Reply #5 on: June 03, 2014, 11:36:46 am »
Don't remember how long it took me to get the last P-41 I did took me but I had to resort to some heat. I had the same sort of problem with a 3120XP ended up using 50/50 mix of ATF and acetone, puller and heat to get the bugger off!
"When the people fear the government...you have tyranny....When the government fears the people....you have liberty"

Thomas Jefferson
1743-1826

Offline Bob

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Re: p 41 flywheel
« Reply #6 on: June 03, 2014, 09:47:47 pm »
Thanks for the tips everyone, finally decided to use the air wrench on the puller and it popped off. However I may have put the rings on the piston up side down not paying attention does it matter if the notch in the rings were it rest against the pin is facing up or down?
 
The circlips have a 90 degree bend were the opening is it ok that it faces toward the cylinder wall?
Thank you

Offline KilliansRedLeo

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Re: p 41 flywheel
« Reply #7 on: June 04, 2014, 07:06:53 am »
The rings MUST be aligned correctly with the locating pin! Most pistons have the locating pin toward the top of the ring groove. The ring must be put on such that the rounded cutout on either end of the ring is aligned with the locating pin.

Not getting what you are saying about the circlip however Nothing should protrude outside the piston toward the cylinder wall. There is a groove inside the piston pin boss where the circlip goes, position the opening in the clip at the 12 or 6 o'clock position.

Here is an article on how to do the clips, is for a motorcycle engine but the process is the same
http://juicemotoparts.com/bearings
"When the people fear the government...you have tyranny....When the government fears the people....you have liberty"

Thomas Jefferson
1743-1826

Offline Bob

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Re: p 41 flywheel
« Reply #8 on: June 04, 2014, 09:06:11 pm »
Thank you, here are some images of the ring & circlip.
With regards to the ring the notch in the end by the opening of the ring that goes on the piston pin does it face towards the top of the piston or towards the bottom of the piston or does it matter?
The circlips with the prongs were it is open I assume the prongs face outward towards the cylinder wall?
Sorry for the confusion hope this helps.
Thanks

                                           

Offline KilliansRedLeo

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Re: p 41 flywheel
« Reply #9 on: June 05, 2014, 06:59:31 am »
There is a very small pin in the ring groove of the piston this in the locating pin for the piston ring.
The locating pin is most often mounted close to the top of the groove but could also be at the bottom.
The little rounded notch in the end of the ring faces which ever side of the groove the locating pin is on.
When the ring is compressed into the groove the notch will wrap round the locating pin.

I don't think you are getting what I told you about the clips. If you look closely at your piston, where the piston pin goes. You will see a groove machined into the piston, this is where the clip goes. No part of the clip should be outside the body of the piston!

Look at the attached picture
"When the people fear the government...you have tyranny....When the government fears the people....you have liberty"

Thomas Jefferson
1743-1826

 

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