Sachs Dolmar Chainsaws Thread

[tjbier]

Well I've had my Makita for 2 years now and have wanted an old Dolmar...
Found one on Clist and
I ended up swaping him my Makita 6401 for the Dolmar 133.
I talked to him briefly and found out he's a member too.
It's a 133 that he got with 143 top end on it, ran it for a while today and it cuts very nice,
Thanks again Noah.

 

[pioneerguy600]

Good idea to start a Sachs thread, it would help :newbie: s like me to find the parts and information that we need. :bang:

My ailing 112 needs lots of tlc to bring it back to peak performance and I need all the help that I can get.

Great ole saws those 112`s , I built and converted a bunch of them to OEM electronic modules, real good saws for their size. Only got one left currently, the grey and black anniversary model.

Pioneerguy600

 

[pioneerguy600]

Well I've had my Makita for 2 years now and have wanted an old Dolmar...
Found one on Clist and
I ended up swaping him my Makita 6401 for the Dolmar 133.
I talked to him briefly and found out he's a member too.
It's a 133 that he got with 143 top end on it, ran it for a while today and it cuts very nice,
Thanks again Noah.

Nice 133, hope that big P&C don`t trash the bottom end, guess it depends on what its going to be used for.

Pioneerguy600

 

[ARsawMechanic]

Great ole saws those 112`s , I built and converted a bunch of them to OEM electronic modules, real good saws for their size. Only got one left currently, the grey and black anniversary model.

Pioneerguy600

What anniversary was the grey/black? I have a white/black 112, was that the same or a different anniversary?

 

[pioneerguy600]

What anniversary was the grey/black? I have a white/black 112, was that the same or a different anniversary?

I don`t have this in writing but I was told by my SD dealer that the silver and black 112`s were made in 1987 for the 60 years of SD`s being manufactured, a 60th anniversary model. Scott or one of our other SD dealers may be able to give further insight into these limited edition saws.

Pioneerguy600

 

[ARsawMechanic]

Piston Rings

Thanks for the answer. Now another question, it includes, but is not limited to Dolmar. I work on a few saws in my spare time in the garage, and most of them are either Poulans, or Craftsman branded Poulans, with an occasional Husqvarna (I won't even start with the "Orange Poulan" comments :taped thrown in the mix. They are mostly "Throw away" saws, & they are usually straight gassed & ruined, or stored too long without being used. With all that said, I haven't really paid attention to the high dollar saws for awhile, but I was looking at the Dolmar 7900, the Solo 681, & one of the larger Husqvarna saws. Just looking at the parts breakdowns online, nothing serious. I noticed one thing common to all of them. These were all larger saws, the size that were beyond the throw away status, & most were either at or near the top of their respective manufacturer's lineup. Larger saws used to have 2 rings on the pistons, but it looks like the trend now is a single ring on the piston. Is it just me, or does that just seem cheap to anybody else? I have always figured 2 rings = longer life with more compression. I know that when I go drop a couple weeks wages on a chainsaw, I am looking for the longevity of a machine that will last for a long time. Have I missed something along the way? I'm just wondering, I can speculate, but thought I would ask if anybody knew if there was a reason for this. opcorn:

 

[pioneerguy600]

I don`t know a whole lot about the newer sawsw having one ring pistons, on the older saws the one ring piston was a faster revving setup but they also wear out faster. Two ring pistons lasted longer and the rings wore more slowly. Guess that for heavier work loads and longer ring life 2 rings would be better, With the advances of new materials and machining being more accurate tolerance wise a tighter fitting P&C may work just as good with one ring but for my work saws I will stay with 2 ring pistons.

Pioneerguy600

 

[ARsawMechanic]

I don`t know a whole lot about the newer sawsw having one ring pistons, on the older saws the one ring piston was a faster revving setup but they also wear out faster. Two ring pistons lasted longer and the rings wore more slowly. Guess that for heavier work loads and longer ring life 2 rings would be better, With the advances of new materials and machining being more accurate tolerance wise a tighter fitting P&C may work just as good with one ring but for my work saws I will stay with 2 ring pistons.

Pioneerguy600

Exactly what I have always thought! Thank goodness I'm not all by myself out there on that limb!!

 

[foche911]

Ps401

Got a another PS401, Sight unseen and not well described. I thought probably stripped cos of serious problem.... Missing brake, cover and flywheel cover. No bar, chain. $5. +$9 ship. Dirty, air filter caked, top cover fried above muffler a little. I didn't see nothing wrong inside except carbon atop piston. AC Plug that I will study later, maybe detonation....Finally decided I would try it. Sabre 40:1 with a touch of Seafoam. I didn't hit till I closed decompression..Then it started. Took a while, and it cleaned up. Limiter caps are gone. I dinked around with it awhile and it seems it might be ok. I will borrow parts from my other and hope to try it in wood tomorrow. see if it will pull....Then I may be looking for the missing covers/brake. Who would have used parts for this?

 

[pioneerguy600]

Got a another PS401, Sight unseen and not well described. I thought probably stripped cos of serious problem.... Missing brake, cover and flywheel cover. No bar, chain. $5. +$9 ship. Dirty, air filter caked, top cover fried above muffler a little. I didn't see nothing wrong inside except carbon atop piston. AC Plug that I will study later, maybe detonation....Finally decided I would try it. Sabre 40:1 with a touch of Seafoam. I didn't hit till I closed decompression..Then it started. Took a while, and it cleaned up. Limiter caps are gone. I dinked around with it awhile and it seems it might be ok. I will borrow parts from my other and hope to try it in wood tomorrow. see if it will pull....Then I may be looking for the missing covers/brake. Who would have used parts for this?

Some of the members on here may have some, try posting your wants in the swap meet at the top of the home page, lots of good guys trading and selling there.
Pioneerguy600

 

[foche911]

Some of the members on here may have some, try posting your wants in the swap meet at the top of the home page, lots of good guys trading and selling there.
Pioneerguy600

Ok

 

[8433jeff]

Try the sponsors on the top of your page, like chainsawr.

 

[Andyshine77]

With today's materials, oils and filtration, I've yet to see any difference with modern saws IMHO. The 7900 has been on the market since 02 and I don't remember anyone having problems with the saw having only one ring, even with the not so great non HD filter. The small Husky saws like the 353, 346 all have one ring pistons and they seem to last forever. Hell some of the older saws don't have any cylinder linings at all. In my experience it simply doesn't matter with today's saws, back in the day I'm sure it did.

 

[zebedee]

With today's materials, oils and filtration, I've yet to see any difference with modern saws IMHO. The 7900 has been on the market since 02 and I don't remember anyone having problems with the saw having only one ring, even with the not so great non HD filter. The small Husky saws like the 353, 346 all have one ring pistons and they seem to last forever. Hell some of the older saws don't have any cylinder linings at all. In my experience it simply doesn't matter with today's saws, back in the day I'm sure it did.

Going back quite a long way,'scraper' rings were originally fitted to car engines to reduce the oil consumption and exhaust smoke, by scraping the lube oil from the cylinder walls back into the sump.
It also had the advantage of reducing 'piston slap', when the skirt of the piston hits the side walls of the cylinder.

There is obviously no advantage in scraping the oil from the cylinder walls with a two stroke engine, in fact that would be detrimental.
So with today's improved materials and lubricants it is difficult to see any advantage in having two piston rings rather than one.

That's my take on it but I'm only a :newbie:
zeb

 

[ARsawMechanic]

Going back quite a long way,'scraper' rings were originally fitted to car engines to reduce the oil consumption and exhaust smoke, by scraping the lube oil from the cylinder walls back into the sump.
It also had the advantage of reducing 'piston slap', when the skirt of the piston hits the side walls of the cylinder.
There is obviously no advantage in scraping the oil from the cylinder walls with a two stroke engine, in fact that would be detrimental.
So with today's improved materials and lubricants it is difficult to see any advantage in having two piston rings rather than one.

Your right, scraper rings have no place in the 2 cycle world. The 2nd ring in a 2 cycle is also a compression ring. And most 4 cycles still use that 3rd (scraper) ring.
What I have noticed over time is that when you get a double ringed saw into the shop, they have higher compression new, & hold that compression thru alot more hours of use/abuse than the single ring.
I took some time tonight to check some of the most popular manufacturers & see what the trend is.
Stihl parts breakdowns show 2 rings all the way down the list to the MS 170. Shindaiwa is using 2 rings quite a way down the list, with only the 2 smallest models having the single ring. Efco is the same way, smallest saws using single ring. I would expect Echo to follow suit with Shindaiwa. Husqvarna shows very few models with the double ring, I would expect Jonsered & Redmax to follow suit, but I didn't check.
Sachs Dolmar used alot of double ringed saws in their day, (wish I still had my old 115 ) but now the only new Dolmar I find with 2 rings is the 9010.
Call me old fashioned, but I believe that when I buy my next saw, I'm going to steer clear of the single ring setup.

 

[foche911]

Do all the SACHS DOLMAR have two rings? I guess I am mainly thinking about the last generation saws.

 

[ARsawMechanic]

No, they didn't. The larger, more "Pro" sizes mainly used 2 rings, while the smaller "entry & homeowner" sizes used a single ring. Both my 112's have single ring pistons.

 

[Andyshine77]

Call me old fashioned, but I believe that when I buy my next saw, I'm going to steer clear of the single ring setup.

If you do you're missing out one some of the best saws made today, maybe ever IMHO.

 

[zebedee]

Call me old fashioned, but I believe that when I buy my next saw, I'm going to steer clear of the single ring setup.

If you do you're missing out one some of the best saws made today, maybe ever IMHO.

Maybe it's different your side of the pond but I've yet to find that anything that is made better today than it was 10 or 20 years ago.
Everything that I look at has been 'value engineered' to a fault and built down to a price imho.

I suppose autos are a possible exception, they're far more complicated than they need be but it's the badly engineered ECUs fitted in the wrong places that fail rather than the basic mechanics.
These ECUs are often so expensive to replace, thousands of $ for an item that probably costs the car maker less than $10 to obtain.
Not good engineering practice except for the auto service industry.

newbie:climbs down from soapbox)

 

[nmurph]

Maybe it's different your side of the pond but I've yet to find that anything that is made better today than it was 10 or 20 years ago.

don't get out a lot, do ya?