066 air filter question?

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timberwolf

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I am having isue with the air filter setup for the 066. Basically it just is not doing the job, and is letting crap into the carb. the saw is only a year old.

Looking at the system it is a; plasic cover with screw retainer, paper and wire mesh filter, fabric pre-filter, and finaly a plastic diffuser cage.

What is that innermost diffuser for?

I think this piece may be holding the main filter away from the carb intake creating a gap for particulate to pass.

It seams all the maiting surfaces on the filter are rather hard and not conducive to making a good seal.

Has anyone found solutions to this, I find the filter setup questionable especialy for dealing with the chips generated by milling. I wonder how hard it would be to improve the intake and filter system for milling purposes.

Brian
 
Brian-

If the piece you are talking about is black plastic with the word 'TOP' written on it, it is there to catch any fuel being thrown back towards the filter system as Steve mentioned. Not sure what happens if you remove it, or if it really needs to be there at all. I have the same thing on my 460, and as I understand it the black piece used to be foam instead of plastic.


To address your question about sealing the filter better, could you find some type of flexible gasket material to place where the pieces mate and seal it up? I havent noticed anything like this with my 460 yet.

-Drew
 
I had much the same thought on the plastic piece, it gets wet with fuel, and also does seem to collect small amounts of fine dust on the wet surface, like to a KN filter?

I had removed it for a while accidently, but put it back on. I had not noticed the "TOP" indicator on it. Maybe it causes seal problems if installed upsided down?

It just looks like one more obstruction to air flow, but I would imagine it would lead to filter weting and resultant poor air flow if removed. Stihl must have put it there for a reason, now what that reason was? good or bad?

I do need to find a solution to the filter clogging with milling chips, I needed to clean it twice on just one cherry log last evening.
 
I know on my saw that when that black piece is oriented via the "TOP" notation, that there is a clip on the back of it that hooks onto part of the carb housing to keep it in place. If you dont have one of those I would check it to see it it happened to break off and order a new one. Its probably worth about $.05 but will cost you about $10.00!
Best of luck-

Drew
 
Timberwolf, you said your filter was "paper and wire mesh filter, fabric pre-filter". I havn't bought a new 066 filter lately, is the new media paper?
I have 2 (actually ended up with 3 now) HD filters and rotate them, after some time I discard them and buy new. The Stihl 066 HD filters I have are not paper.
I may be telling grandma how to suck eggs here but I have seen dusted motors from guys using air at full line pressure to clean (rather destroy) air filter media.
 
I will take another look at at, but it sure looks like some sort of paper. Basicaly it's just like an automotive filter with corigated folds inside a wire screen to keep it all together.
 
066

Sounds like you have the old filter setup. This requires a rubber gasket between the filter and the housing. The new filter has the gasket built onto the filter. It also does not have corrugations, it is smooth.
The new filter will fit on the old setup. Remove the gasket and use the locking tabs on it to fill the holes that held it in, or use silicone sealer. Just make sure you fill the holes.
 
Picked up a new filter, the new one is not the same, flat instead of corigated, plastic slots on the inside to let the air through vs wire mesh, fiber based media, and 2 fairly soft rubber ridges to make the seal to the carb. Might have to get one of thouse new fangled digital cameras so I can post pics of stuff like this.

I checked out the plastic piece inside, the clip was fine, no markings on mine to indicate "TOP" and if you try it is possible to put it together upsidedown which would cause seal problems. certainly not idiot proof, I guess the manufactures assume that idiots should not be using chainsaws anyway.

I wonder how an old filter got on a new saw, might not put it past someone to unload some old stock and swap things around presale.

Brian
 
Brian,

Mine is as you just described.  It has the same part number as in the photos Dave submitted, except that it has a "B" appended.  There appears to be the same two rubber ridges on his item, however, so it sounds like yours was even older.  If I remember right, the filter also fits snugly around a plastic projection, so the two ridges aren't the only sealing surface.

On my saw, the plastic diffuser doesn't have "written" indication as to which way is up, but the hole is off-center and it's fairly obvious in the general scheme of things if it's put on wrong.  In fact, if it is inserted wrong way up it most definitely would create a filterless situation.

I guess I don't know exactly when my saw was made, but I'd seen it on the dealer's shelf for better than a year before I picked it up new this spring.

Glen
 
filter

I think you will find the newer filter will work better. The old one perforated too easily. It is also a wear item, even though most of the loggers around here think it should last forever.
Remember, the name on the wrap goes on top. Makes a big difference on how clean the filter stays. I am finding that if the wrap is replaced when it no longer fits snug, the filter will last much longer.
 
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