Author Topic: Cold weather shutter use  (Read 875 times)

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Offline Fishnuts2

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Cold weather shutter use
« on: January 13, 2017, 09:31:44 pm »
I asked this in another forum, but would like to get more opinions.
My 036 Pro did not have a cold shutter installed. Could that have caused a seizure in warm weather? I bought it from original owner seized up. I put new piston, rings, and seals in it and now seems good to go. I also ordered a shutter for it just in case.
How big a deal is the shutter on saws in your experience?
Thanks!


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Offline DNX800

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Re: Cold weather shutter use
« Reply #1 on: January 14, 2017, 04:11:16 am »
No, that shouldn`t have caused a seizure in warm weathrer when there is no winter or cold shutter. The seizure must have a other reason for example old fuel or an air leak somewhere.

You could may be get a problem with a seizure when you use the saw in warm weather and your cold shutter is closed in the winter position. In this case it is possible to get a seizure of the piston and cylinder, because the engine gets to hot. This cold shutter should prevent carburetor icing in the temp range near 32°F and high humidity.

That`s just my opinion.

Offline HolmenTree

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Re: Cold weather shutter use
« Reply #2 on: January 14, 2017, 08:50:07 pm »
I'm confused what you guys are saying when the "shutter was not installed" and "it closed in the winter position ".

All the 034/036 I ran had a window (shutter)in the top cover between the cylinder and air box in the top cover partition.
Plus the back cover that housed the air filter had another shutter/window that could be opened closed for the air intake through either the grill in the cover from the lower back or at the top screen.
Also for the winter operation of the heat transfer from the cylinder could only be made when the special winter back cover with the rubber flange was installed.
This rubber flange sealed the gap betwern the 2 top covers.

So if this winter cover was not on the OP's 036 there is no way it would overheat no matter if the shutters were opened or closed.
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Offline HolmenTree

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Re: Cold weather shutter use
« Reply #3 on: January 15, 2017, 10:00:10 am »
Just to add to my last post, your 036 may not have the 2nd air intake shutter in the rear cover (air filter).
I was thinking of my 044 which had that air intake grille down near the rear handle plus the screen intake at the top.
Making a living with a saw since age 16.

Offline Fishnuts2

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Re: Cold weather shutter use
« Reply #4 on: January 16, 2017, 10:04:45 am »
My saw has the black cover for the grill in the air box, and the manual says to remove it and store in the lower portion of the air box cover for cold weather conditions.  The black shutter in the engine cover was not installed on my saw, although there is a provision for it, and the manual says that it should be closed for warm weather use, and open for cold conditions.

My thoughts were if this were open in warm weather it could affect the cooling of the motor, possibly causing it to seize.  Have you guys seen other saws without this shutter and running in hot weather successfully?

Offline HolmenTree

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Re: Cold weather shutter use
« Reply #5 on: January 16, 2017, 02:48:13 pm »
So are you saying the hole is open in the wall between the cylinder and carb with no way of closing it off?

I never heard of a saw overheating enough with the shutter open to cause it to seize

Like I said there's enough outside air that's able to get into the airbox drawn through the gap between the two top covers.
I had a 066 that was missing the rotary shutter that blocked the heat transfer hole. I worked that saw many times on summer afternoons well over 100F including chainsaw milling.  Just sold that 25 yr old saw in excellent running condition and it never had its cylinder off.
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Offline Fishnuts2

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Re: Cold weather shutter use
« Reply #6 on: January 16, 2017, 07:44:22 pm »
So are you saying the hole is open in the wall between the cylinder and carb with no way of closing it off?

I never heard of a saw overheating enough with the shutter open to cause it to seize

Like I said there's enough outside air that's able to get into the airbox drawn through the gap between the two top covers.
I had a 066 that was missing the rotary shutter that blocked the heat transfer hole. I worked that saw many times on summer afternoons well over 100F including chainsaw milling.  Just sold that 25 yr old saw in excellent running condition and it never had its cylinder off.
That answers my question. The saw was lean seized when I bought it and I was trying to figure out the cause. It's all new inside now, including a new shutter!
Thanks much!


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