Author Topic: Poulan 330 3450  (Read 12238 times)

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Offline 3000 FPS

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Re: Poulan 330 3450
« Reply #400 on: December 06, 2017, 07:34:06 pm »
I have never seen a piston for a 330,3450,3500,3750 that did not a have a pin in the ring groove so that the ring cannot rotate.   
PP 505, 475, 445.
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Offline Cut4fun .

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Re: Poulan 330 3450
« Reply #401 on: December 06, 2017, 07:41:44 pm »
I have never seen a piston for a 330,3450,3500,3750 that did not a have a pin in the ring groove so that the ring cannot rotate.   

This ^^^^^^^^^


We need pics of what you got going drum
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Re: Poulan 330 3450
« Reply #402 on: December 06, 2017, 07:44:13 pm »
54cc to show have 60cc too

see the pin left of rear in 1st pic.  would be on right side installed in saw at rear.
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Re: Poulan 330 3450
« Reply #403 on: December 06, 2017, 07:45:06 pm »
Ah, I see where the confusion is now.  When speaking of pin offset, I am referring to wrist pin.  Some engines have offset wrist pins, i.e. not in the center of the bore, to reduce piston slap.

When referring to these PoulanPro 330's, I am saying of three different pistons, (two from 2007),one has the ring gap pin on the intake side and the '07's have the ring gap pin on the exhaust side...Why?

They can apparently be installed either way.


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Re: Poulan 330 3450
« Reply #404 on: December 06, 2017, 07:46:17 pm »
Nope just saying nope not right. do what you want
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Re: Poulan 330 3450
« Reply #405 on: December 06, 2017, 07:48:30 pm »
Ring gap needs uninterupted cylinder wall, correct?

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Re: Poulan 330 3450
« Reply #406 on: December 06, 2017, 08:13:11 pm »
Just dropped a piston in a cylinder with gap marked at skirt.  Gap at intake side just barely makes it past transfer to cylinder wall.  Was factory assembled and running like this with no damage, but obviously WRONG.

Glad I tore this saw back down.  Had dropped a previously ported cylinder on saw, and didn't think much about it since it was in new condition.

I wonder how many they shipped like this?

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Re: Poulan 330 3450
« Reply #407 on: December 06, 2017, 08:22:17 pm »
With the 3 different Pistons did you happen to notice if there was any difference in the cylinder ports.
PP 505, 475, 445.

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Re: Poulan 330 3450
« Reply #408 on: December 06, 2017, 08:34:34 pm »
With the 3 different Pistons did you happen to notice if there was any difference in the cylinder ports.

Nothing different with cylinders other than one being mildly ported. Tried to see  something different with combustion chambers, but nadda.
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Re: Poulan 330 3450
« Reply #409 on: December 08, 2017, 05:11:30 pm »
Saw went back together yesterday.  Swapped piston with one that was originally run with ported cylinder.
Tore it down to replace crank seals, but took it completely down to crank in hand.  Seals looked fine,... should, being new. Reassembled and sealed with permatex aviation.

Any running issues have vanished.  Running strong.

Also built a pump drive puller so I didn't have to wait for shipping.   Used a 1/2" plumbing union, a 1/2 -3/8 hex (required internal grinding past threads), and a fine thread G8 bolt.
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