Author Topic: Craftsman 3.7 Piston Question  (Read 293 times)

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Offline roostersgt

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Craftsman 3.7 Piston Question
« on: January 19, 2014, 04:44:17 pm »
I acquired a red / black Craftsman 3.7 (Poulan 3700) and need to change out the piston and cylinder. Found new cylinder and piston set-up, but can't get the old / damaged piston off the crankshaft. Can't seem to find any piston circlips to remove to release the piston.. Anyone have any suggestions? Are the pistons somehow pressed on / off? I'm stumped ???. Thanks.

Steve
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Offline Cut4fun .

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Re: Craftsman 3.7 Piston Question
« Reply #1 on: January 19, 2014, 04:56:23 pm »
I dont know these well. There is guys here that know them really well to help you.

Just some info to pass on I have read.  ChainSaw Service Manual 10TH Edition says to use Poulan piston pin removal tool 31069

OhioGregg's pics





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Re: Craftsman 3.7 Piston Question
« Reply #2 on: January 19, 2014, 09:22:43 pm »
Not much to say really, just like Cut4fun showed the wrist pin has to be pressed in and out.  If you do not have one of those they are a real pain.   I would study the picture and maybe try to make one.
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Offline roostersgt

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Re: Craftsman 3.7 Piston Question
« Reply #3 on: January 19, 2014, 11:30:18 pm »
Thanks for the replies. May have to try to fabricate one, or try a vice / pulley remover? That tool in the pics looks home-made. What keeps the pin from creeping out? Does it only press in / out one way?
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Offline magnumfloyd

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Re: Craftsman 3.7 Piston Question
« Reply #4 on: January 20, 2014, 12:24:33 am »
This is the way that I have done it to my 3400 and in now way is the correct way. I just layed the saw on the workbench on its side and supported the rod with a 2x4 and used a drift punch to remove and install the new piston . The saw runs great even with a scored cylinder I left out the base gasket as the squish was huge.

Offline 660magnum

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Re: Craftsman 3.7 Piston Question
« Reply #5 on: January 20, 2014, 12:28:14 am »
This is the way that I have done it to my 3400 and in now way is the correct way. I just layed the saw on the workbench on its side and supported the rod with a 2x4 and used a drift punch to remove and install the new piston . The saw runs great even with a scored cylinder I left out the base gasket as the squish was huge.
I've done this also with tight pins.
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Offline roostersgt

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Re: Craftsman 3.7 Piston Question
« Reply #6 on: January 20, 2014, 03:36:32 pm »
Great idea. I'm going to go with the pin "beat down" method on the bench. Thanks.
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Offline Eccentric

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Re: Craftsman 3.7 Piston Question
« Reply #7 on: January 20, 2014, 04:41:32 pm »
Great idea. I'm going to go with the pin "beat down" method on the bench. Thanks.
Just be damn sure you support that piston when doing that.  Make a 'form fitting' cradle for it with a block of wood.  Be sure to support the crank and rod so they stay in position too.
-Aaron

For older saws:
Tune the H side so that it 4-strokes (burbles) at WOT unloaded and just cleans up when under load.
When you lift cutting load, the saw should immediately revert to 4-stroking.  Fine tune the transition point for the wood you're cutting.

Offline roostersgt

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Re: Craftsman 3.7 Piston Question
« Reply #8 on: January 20, 2014, 06:57:42 pm »
Safe advice. I also picked up a metal C clamp and will try to push it out first.
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