Dolmar 166 question

[ScottishGeorge]

Hi all

Long time lurker and new poster here.

I recently got hold of a Dolmar 166 with a 48 inch bar and an alaskan mill attachment. The saw had been stored in someones barn since the early nineties. It was a bit grubby with all the alloy a bit oxidised and the paint peeling in places but the owner said it had only about 20 hours on it. I also got a 20 inch bar and some spare filters etc. thrown in.

After cleaning it up, flushing it out and changing filters etc. I filled it up and it started after a half a dozen pulls!

Now it sounded fine and ran with no problems so I put a tank of fuel through it and cut up a load of larch logs I had in the yard. It ran absolutely fine.

Next day I put the big bar and the mill on and took it into the woods to try cutting some planks. I started with an 18 inch Larch that it should have had no problem with, but the minute I turned the saw on it's side it started to cough and cut out. It would run at full revs but it kept bogging down and stalling on a six foot cut. As I found out towards the end of the first cut it was also leaking fuel from somewhere - lot's of fuel! and for the life of me I cant find out where it was coming from.

Has anyone out there any experience with these? Any ideas what's going on with it?

I'm not the worlds best mechanic and outside of doing all the usual basic maintainance stuff I quickly get a bit lost so if anyone has any thoughts I'd be really grateful.

Thanks

ScottishGeorge

 

[Jacob J.]

Your fuel line probably needs replaced and check the tank vent as well.

 

[ScottishGeorge]

Your fuel line probably needs replaced and check the tank vent as well.

Thanks Jacob.

Fuel line seems to be sound but I can't find the tank vent.

Any ideas where it should be on a 166?

George

 

[pioneerguy600]

Click on the green link below and it will show you all of the parts of your saw. IPL

http://s30387.gridserver.com/partsDiagrams/Dolmar%20166.pdf

 

[ScottishGeorge]

Click on the green link below and it will show you all of the parts of your saw. IPL

http://s30387.gridserver.com/partsDiagrams/Dolmar%20166.pdf

Thanks very much pioneerguy. That's very useful, I don't suppose you know why the vent hose is closed with a screw?

George

 

[pioneerguy600]

Thanks very much pioneerguy. That's very useful, I don't suppose you know why the vent hose is closed with a screw?

George

A lot of chainsaw makers used different types of threaded inserts into the vent lines of chainsaws of this era. The threads are just sized to push into the line, not screwed in as that would block the small air passages the threads allow for the passage of air back into the tank.

 

[ScottishGeorge]

A lot of chainsaw makers used different types of threaded inserts into the vent lines of chainsaws of this era. The threads are just sized to push into the line, not screwed in as that would block the small air passages the threads allow for the passage of air back into the tank.

Now that is useful - the one in mine seems to have been replaced by a woodscrew! I'll back it off a bit and try that - it may well have been screwed in too tight which could explain why it would run at full throttle but die as it slowed.

I'll pull the rest of the fuel line as well and see if I can find that leak.

Thanks for your help.

George

 

[pioneerguy600]

If you go back and look at #32 on that schematic we all like to call an IPL then you will see a fitting that has two nipples on it. This is found on many of the Sachs Dolmar saws and is a type of fuel vent that allows air back into the tank through one side/nipple and fuel to be sent to the carb through the other. Not sure if your saw is set up this way or not but that #32 just plugs into your fuel tank and I have seen them leak around the vent on a few of my SD saws.

 

[pioneerguy600]

Now that is useful - the one in mine seems to have been replaced by a woodscrew! I'll back it off a bit and try that - it may well have been screwed in too tight which could explain why it would run at full throttle but die as it slowed.

I'll pull the rest of the fuel line as well and see if I can find that leak.

Thanks for your help.

George

It should not be screwed in as this allows the threads to actually cut into the hose, it really needs to just push in and don`t let the head seal off the end of the hose.

 

[ScottishGeorge]

If you go back and look at #32 on that schematic we all like to call an IPL then you will see a fitting that has two nipples on it. This is found on many of the Sachs Dolmar saws and is a type of fuel vent that allows air back into the tank through one side/nipple and fuel to be sent to the carb through the other. Not sure if your saw is set up this way or not but that #32 just plugs into your fuel tank and I have seen them leak around the vent on a few of my SD saws.

Aaaand - Bingo!

Thats where it seems to be coming from. The line is sound but that fitting has loosened where it plugs into the tank fitting.

I'll try and bodge something to fix it while I search for a part.

Dolmar parts are as scarce as hens teeth over here.

Thanks again

George

 

[pioneerguy600]

Aaaand - Bingo!

Thats where it seems to be coming from. The line is sound but that fitting has loosened where it plugs into the tank fitting.

I'll try and bodge something to fix it while I search for a part.

Dolmar parts are as scarce as hens teeth over here.

Thanks again

George

....

 

[Warped5]

Aaaand - Bingo!

Thats where it seems to be coming from. The line is sound but that fitting has loosened where it plugs into the tank fitting.

I'll try and bodge something to fix it while I search for a part.

Dolmar parts are as scarce as hens teeth over here.

Thanks again

George

George, there are a few members over there that may be able to help. Superdolmar and Belgian come to mind.

There are also sources over here on this site: edgeandengine - 166 - cuttinscott

Good luck!
Ted

 

[ScottishGeorge]

George, there are a few members over there that may be able to help. Superdolmar and Belgian come to mind.

There are also sources over here on this site: edgeandengine - 166 - cuttinscott

Good luck!
Ted

Thanks Ted - If I get stuck I'll look them up.

George

 

[pioneerguy600]

Most of those tank vent/pickup parts are just a press fit with an O ring to help seal it to the tank. I have found a few that has seemed to shrink and won`t fit tight again. A couple wraps of pink teflon tape has sealed them at least for now.

 

[ScottishGeorge]

Most of those tank vent/pickup parts are just a press fit with an O ring to help seal it to the tank. I have found a few that has seemed to shrink and won`t fit tight again. A couple wraps of pink teflon tape has sealed them at least for now.

That's kind of what I was thinking for the bodge. The o-ring seems to have perished and has a crack through one side. Some plumbers mate and a bit of teflon should see it ok til I can find a new part.

George

 

[SawTroll]

....

Dolmar parts are as scarce as hens teeth over here.

Thanks again

George

The guys (site sponsors) at "The Cutting Edge" (AS members CuttinScott and 166) may be able to help you? At least they have several 166 saws between them, and are Dolmar dealers. :msp_smile: