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Author Topic: Replaced piston/cylinder now won't fire  (Read 3059 times)

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Offline sharkey

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Re: Replaced piston/cylinder now won't fire
« Reply #50 on: December 15, 2013, 03:32:52 am »
I heard of some aftermarket kits that were supplied with in-correct rings.  They were too small.  I would think you would notice this putting them on, but maybe they were pretty close and only the gap was off?  When you take your cylinder back off, slip the rings into the cylinder without the piston and see what the gap looks like.     
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Offline danders

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Re: Replaced piston/cylinder now won't fire
« Reply #51 on: January 07, 2014, 01:40:24 pm »
Did this ever get resolved?  Checking the ring end gap seems like a good idea. Also, since the piston was replaced is there any chance it went in backwards? I would guess that you would have run into problems with the ring ends hanging up in the exhaust port if that was the case so it seems pretty unlikely.
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Offline Ljute

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Re: Replaced piston/cylinder now won't fire
« Reply #52 on: January 11, 2014, 09:46:12 am »
Will we ever hear the conclusion? My money's on a wrong piston.
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Offline 3000 FPS

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Re: Replaced piston/cylinder now won't fire
« Reply #53 on: January 11, 2014, 11:56:37 am »
Quote from: Ljute on January 11, 2014, 09:46:12 am
Will we ever hear the conclusion? My money's on a wrong piston.


I was kinda of leaning that way myself.
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PP 505, 475, 445.

Offline wbhburn

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Re: Replaced piston/cylinder now won't fire
« Reply #54 on: February 09, 2014, 05:37:39 pm »
No positive resolution yet. Thanks for your concern.

As I was taking some pictures of the cylinder to post, I looked closely at the ring to see how it fit when completely compressed. I noticed it did not close completely and on even closer inspection realized that part if the end was broken off. The ends did not meet at all. Don't know when that happened but -MIGHT THAT BE A SOURCE OF COMPRESSION LOSS?  :'(

Furthermore, on my first attempt to get the cylinder over the piston I think I both slightly damaged the piston and scored the head. Between all those errors, I'm sure it's not sealing properly. Better start over with a new piston/cylinder.

Now, does anyone have an old 361-371 class saw for sale? Is $200 - $350 a reasonable price?
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