660 gas cap leaking

[SouthSoundTree]

Anybody have this problem with the screw caps? Is there supposed to be an "o"-ring or just plastic to plastic seal? I don't want to crank it down too much if it needs some type of gasket. BTW, I got the saw used, so I don't know the vintage. Neither super new, nor super old. Guess its before the flip-caps.

 

[SkwerI]

Just buy a new cap at any Stihl dealer. Stihl redesigned the caps because they had the screwdriver slot to loosen them in case they were too tight, so everybody just cranked them down too tight using a screwdriver because the slot was there. If you buy a new cap and NEVER use a screwdriver to tighten it, then it will never leak and you will never need the screwdriver to remove it.

Of course now half the forum members will pitch in to say that they have used a screwdriver on their caps for decades and never messed one up. Whatever. You don't NEED a screwdriver unless you use a screwdriver all the time, then you will squish the seal so that you will end up needing the screwdriver to keep it from leaking. Your method creates the problem (for others, not yourself because you do it perfectly).

 

[Husabud]

Send it to me and I'll let you know if you should keep it. I'll even pay the shipping.

 

[Reddog]

Just buy a new cap at any Stihl dealer.

+1

 

[Husabud]

+1

Agreed. I have been looking for a while now with no luck. Sooner or later one will show.

And Thanks Reddog!

 

[SouthSoundTree]

Send it to me and I'll let you know if you should keep it. I'll even pay the shipping.

Okay, the cap's packaged up, just let me know your address.

 

[Husabud]

 

[Al Smith]

I had to go look .It's got a sealing ring .A flat rubber type seal although an o-ring would probabley work .Stihl list two numbers .0000 359 1220 for the newer cap which is higher .The older flatter cap seal is 0000 992 6302

 

[Marc-Antoine]

On the screw cap, it's a flat seal, not an O-ring. So, over tighten the cap makes the tank's hedge digs in the rubber.

What said Skwerl is right. I noticed it on my 066. The seal is worn (actually not worn but put out of shape) but you can make it works again easily, at least for a quick fix, by flipping it side to side. Like that you get a nice flat area to seal the gas tank and the grooved area lays on the cap's flat surface with no trouble. And just seat the cap by hand.
It works well.

If there isn't no more seal, I'd prefer buying a new cap rather than finding just a seal. It's hard to get the proper rubber, the present crappy gas is a pain for the elastomeric compounds.

 

[Burnham]

As usual, Brian is dead on. Take his advice, done.

 

[stig]

Of course now half the forum members will pitch in to say that they have used a screwdriver on their caps for decades and never messed one up. Whatever.

I was going to say that I have used a screwdriver on mine for decades and messed them up by the dozen.
I always keep a spare in my truck.

 

[MasterBlaster]

Just don't "stab" the feckers and you'll be golden.

 

[flushcut]

I think you should go buy a new flippy cap for you saw. The flippy caps are the best cap going and the best part is that you don't need any tools to remove or instal them just hours of frustration and the new found uses of profanity are a side benny.

 

[CurSedVoyce]