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Author Topic: Stihl 036 possible seal leak?  (Read 1808 times)

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Offline Cam460

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Stihl 036 possible seal leak?
« on: January 30, 2019, 10:58:28 PM »
Hi I am new to this forum and wanted to know if anyone had some advice. I rebuilt a stihl 034 last year (new jug, piston, (big bore/036) tank and some other small stuff) it ran fine for about 6 months but recently it will not hold a tune. When it first fires up it idles high and once warm will idle normal but after about a half tank of gas it starts getting boggy. Once I re tune it it will do the same thing last about a half tank of fuel. I have tried pulling the clutch and checking so play on the crank and it has none, I have also cleaned the carb and checked the jug to case gasket and that also seems ok. And suggestions? 
Thanks, 
Cam

Offline doc henderson

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Re: Stihl 036 possible seal leak?
« Reply #1 on: January 30, 2019, 11:22:22 PM »
check for crack in molded fuel line?  unless you can retune and finish the tank.  the crack may be at the half tank level.

Offline Cam460

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Re: Stihl 036 possible seal leak?
« Reply #2 on: January 30, 2019, 11:32:16 PM »
Thank you for the reply, I will definitely check this out but I can re tune and finish the tank. 
Thanks,
Cam

Offline doc henderson

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Re: Stihl 036 possible seal leak?
« Reply #3 on: January 30, 2019, 11:34:33 PM »
there are many chainsaw experts here who will reply soon,  good luck

Offline Cam460

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Re: Stihl 036 possible seal leak?
« Reply #4 on: January 31, 2019, 12:03:28 PM »
Update. I pulled the cylinder back off the saw thinking maybe there is an air leak between the jug and case. Just waiting on a new gasket to come in. All the internals look great since the rebuild no scoring at all! Any advise would still be greatly appreciated.

Offline limbwood

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Re: Stihl 036 possible seal leak?
« Reply #5 on: January 31, 2019, 12:15:40 PM »
spray carb cleaner around seals and gaskets while running it will rev when you spray by a leak.

Offline Cam460

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Re: Stihl 036 possible seal leak?
« Reply #6 on: January 31, 2019, 12:34:42 PM »
I tried this right before I pulled the cylinder. it did not have any affect on idle. Definitely an annoying problem! 

Offline wild262

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Re: Stihl 036 possible seal leak?
« Reply #7 on: January 31, 2019, 01:39:58 PM »
You have a impulse line as well.  Did you check that?  If it doesn't cause any problems till half a tank is run, than it could be the coil.  Coils don't always stop dead when they heat up.  If you have a spare, try that.

Offline Cam460

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Re: Stihl 036 possible seal leak?
« Reply #8 on: January 31, 2019, 01:59:03 PM »
Thank you for the advice, I checked the impulse line and it looks new but never thought of the coil. If the saw still acts up Once I get it back together I will put a new coil in it to see if that helps. 
Thanks, 
Cam

Offline limbwood

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Re: Stihl 036 possible seal leak?
« Reply #9 on: January 31, 2019, 02:58:44 PM »
might be water in fuel, have had a drop of water in carb bounce around and make it run wierd.

Offline doc henderson

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Re: Stihl 036 possible seal leak?
« Reply #10 on: January 31, 2019, 03:12:04 PM »
I have had large tanks with water, put into clear plastic pepsi bottles and then decanted off the gas and discarded the water that settled to the bottom.  could use a small glass jar, or look into gas jug and look for bilayer of water on bottom.  Also, if it acts up, could let it cool off without re tune and see if it runs fine cold.  I had the new 660 and had all kinds of trouble and gave it back to the dealer, and got the 880.  Sounds like you are quite the mechanic, so thanks for letting me feel like I was helpful. lol

Offline Cam460

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Re: Stihl 036 possible seal leak?
« Reply #11 on: January 31, 2019, 08:28:43 PM »
Thanks but I would rule out water because I run my saws almost everyday and am constantly mixing fresh gas. And I am far from a pro at this but try my best 😂

Offline welderskelter

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Re: Stihl 036 possible seal leak?
« Reply #12 on: January 31, 2019, 08:40:40 PM »
I have an 066 that always had issues with not idling for a long time. Finally done a crankcase check and bingo there was my problem. Runs good now. New seals done the trick. go for it.

Offline Cam460

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Re: Stihl 036 possible seal leak?
« Reply #13 on: January 31, 2019, 08:59:02 PM »
Yeah if the cylinder gasket doesnt do the trick thats my next step. Can you do the seals without splitting the case?
Thanks,
Cam

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Re: Stihl 036 possible seal leak?
« Reply #14 on: February 01, 2019, 04:53:08 AM »
   Tank vent, fuel filter.  Did you check these out?

Offline ZeroJunk

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Re: Stihl 036 possible seal leak?
« Reply #15 on: February 01, 2019, 06:42:55 AM »
Yeah if the cylinder gasket doesnt do the trick thats my next step. Can you do the seals without splitting the case?
Thanks,
Cam
Yes.

Offline Cam460

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Re: Stihl 036 possible seal leak?
« Reply #16 on: February 01, 2019, 03:57:33 PM »
Awesome thank you

Offline welderskelter

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Re: Stihl 036 possible seal leak?
« Reply #17 on: February 01, 2019, 05:41:59 PM »
You will need a flywheel puller bolt and nut. You can get them on ebay .

Offline wild262

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Re: Stihl 036 possible seal leak?
« Reply #18 on: February 01, 2019, 06:19:12 PM »
              Just loosen the flywheel nut till its flush with the crank end, give it good square smack with a brass hammer, and it should pop right off. 

Offline Cam460

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Re: Stihl 036 possible seal leak?
« Reply #19 on: February 07, 2019, 02:45:39 PM »
Thanks for the info! Im still waiting on the cylinder gasket to come in (you know how that goes :D). Guessing this wont solve the problem I guess it was worth a shot before diving into crank seals. 


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