Screamin' Dolmar

[scubasawyer]

brought my 112 (DRY) to factory authorized dealer for possible bad coil. Dealer called me 2 weeks later to advise that my saw "seized" during his efforts to warm it up to see if coil would cut-out. He said he had a tach on it, and it immediately went to 18,000 rpms. Asked what he fueled my saw with and he stated it was his usual "shop mix". After hanging up the phone,
it dawned on me that his shop mix is probably the most common today 50:1. My old Dolmar takes a 24:1 or 32:1 mix(can't remember off top of my head-that's why it's printed on the fuel cap) Would too lean a mix make the saw scream uncontrollably???? He stated he turned the high limit down to around 10,000 rpms, and ran it for 10 min. then it siezed. No problems with saw prior to that.... Any input from techs is greatly appreciated. thanx.

 

[stckciv]

It doesnt matter what the saw says, as long as he had a good mix he is ok.

I have a gokart that the engine says mix a straight 30W with the gas and I use the 50:1 ratio with no problems.

 

[Woodsrover]

No, I don't think a thin mix like that would cause the saw to rev all that much more than with the mix it's supposed to have. But I would think running an old saw on half the mix it's supposed to, and at full throttle could certainly do some damage. New 2-cycle oil is better than the old stuff but that still doesn't mean you can cut your mix by 50%.

I think the guy owes you a huge apology of not some credit on a new saw.

My $0.02

Jim

 

[TimberPig]

I doubt his mix had anything to do with it, as the 50:1 mix actually will make the saw run more richly than the mix you were using would.

I would lean towards an air leak based upon the symptoms you've described.

 

[THALL10326]

brought my 112 (DRY) to factory authorized dealer for possible bad coil. Dealer called me 2 weeks later to advise that my saw "seized" during his efforts to warm it up to see if coil would cut-out. He said he had a tach on it, and it immediately went to 18,000 rpms. Asked what he fueled my saw with and he stated it was his usual "shop mix". After hanging up the phone,
it dawned on me that his shop mix is probably the most common today 50:1. My old Dolmar takes a 24:1 or 32:1 mix(can't remember off top of my head-that's why it's printed on the fuel cap) Would too lean a mix make the saw scream uncontrollably???? He stated he turned the high limit down to around 10,000 rpms, and ran it for 10 min. then it siezed. No problems with saw prior to that.... Any input from techs is greatly appreciated. thanx.

This is a easy one but one question first. What happened about the coil, was it good or bad?

 

[PES+]

I would like to see a 112 hit 18k no matter WHAT the mix....and Timberpig is correct Mix did not cause it it would run slightly richer @ 50 to 1.

I would ask what the dealer can do for you but if they are resistant to help you take your saw and find another dealer.....it can happen but 18,000 RPM is damn near if not impossible on a 112 so I suspect incompetence and butt covering

 

[PES+]

*Runs and hides from Cuttinscott*

 

[Chainsaw Master]

Seems as tho you should be discussing with the factory authorized dealer, the cost of rebuilding your classic 112 Dolmar...... that he blew up...

 

[Lakeside53]

*Runs and hides from Cuttinscott*

:hmm3grin2orange: :hmm3grin2orange: :hmm3grin2orange:

 

[cuttinscott]

brought my 112 (DRY) to factory authorized dealer for possible bad coil. Dealer called me 2 weeks later to advise that my saw "seized" during his efforts to warm it up to see if coil would cut-out. He said he had a tach on it, and it immediately went to 18,000 rpms. Asked what he fueled my saw with and he stated it was his usual "shop mix". After hanging up the phone,
it dawned on me that his shop mix is probably the most common today 50:1. My old Dolmar takes a 24:1 or 32:1 mix(can't remember off top of my head-that's why it's printed on the fuel cap) Would too lean a mix make the saw scream uncontrollably???? He stated he turned the high limit down to around 10,000 rpms, and ran it for 10 min. then it seized. No problems with saw prior to that.... Any input from techs is greatly appreciated. thanx.

The most common prob with this saw was the HK Tillotson carburetor. The metering block would warp and an air leak would be the result. 50-1 did nothing to cause this it probably was a air leak. The coils in this saw usually worked or didn't how long did he hold her open??? 18K does seem a bit far fetched.

This is a easy one but one question first. What happened about the coil, was it good or bad?

If it ran I would guess the coil was OK

*Runs and hides from Cuttinscott*

?????Archie have you had your furnace checked lately????


Scott

 

[THALL10326]

The most common prob with this saw was the HK Tillotson carburetor. The metering block would warp and an air leak would be the result. 50-1 did nothing to cause this it probably was a air leak. The coils in this saw usually worked or didn't how long did he hold her open??? 18K does seem a bit far fetched.



If it ran I would guess the coil was OK



?????Archie have you had your furnace checked lately????


Scott

LOLOLOLOLOLOL, furnace checked, now that was good.

Scott are you saying I can't hold my 5100 wide open for 10 minutes striaght, well durn,:hmm3grin2orange: :hmm3grin2orange:

 

[PES+]

Don't have one



But Scott...I have a question.......why did Dolmar copy the Homelite Super 2 on the 3410T?

 

[DOLMARatOs]

That sux. I'm also dubious about a 18,000 rpm 112. I'll take the side of everyone else. If your dealer doesn't fix it, replace it, offer some money on a new saw, etc. you'd be further ahead to never do business there again and then blast em all over town. Word of mouth is a powerful tool.

A 510 Dolmar would be a great replacement for that 112. I do know a guy who has a great 112 running and ready to go that you could use.

If a customer comes in complaining of ignition coil problems and I run his saw for "10 minutes" and it blows up, chances are...it was my fault some way.

 

[cuttinscott]

But Scott...I have a question.......why did Dolmar copy the Homelite Super 2 on the 3410T?

I did not know a top handle was exclusive to Homie?? Other than the handle being top mounted what else resembles a super II???

Scott

 

[PES+]

Ran it for 10 minutes AFTER it tached 18K

Then it blew up.....

Well the London Bridge IS in Arizona

 

[PES+]

Let me see

Reed intake in pretty much the exact same place....the bare block looks for all the world like the super 2 bare block........same crank layout but they did use a better carb but they didn't use the dual controls

Closer to the Super 2 than the Echo 3400

My point is that the Super 2 must not have been that bad a design

Unfortunately they used the same lame flapper reed design..... ugh

 

[scubasawyer]

Thanx for the input.... The only reason I brought the saw in for service was for a coil/ignition system check. It started cold on 2 pulls, ran and cut like a champ until it got hot, then engine would begin to cut-out on me. If I could catch it in time and keep it from stalling, and get it to idle for a couple minutes, it would come back to life. But if it stalled, it was time to go home, cuz it just was not going to re-start. The saw was compression tested the previous summer, and was right in spec. At that time, previous Dolmar dealer stated that coil was intermittent, but none in stock. Used it several more times, ran like a dream until it got hot, then it would quit after running for 30 to 45 minutes. I made no carb adjustments nor did i tinker with it in any fashion, other than checking the plug and cleaning the air filter screen. I had used the saw just several days before bringing it in for service, due to the same scenario as above.

Dealer said it started and revved immediately to 18k, he turned it down, and ran it with throttle lock on for 10 min. prior to seizing per his report.

Sounds like maybe some forgot to put oil in the mix, and was running straight gasoline.....????? Would this produce these symptoms????

 

[PES+]

Sounds like cuttinscott called it...and maybe a crank seal as well...it is possible that you tore a crank seal last time you used it..but the symptom you describe sounds like an air leak. When it would start to die and you did manage to get it back to idle did it idle high or did the idle climb in rpm with no throttle?

 

[scubasawyer]

No , this saw never revved or ran irregularly in any fashion, other than ive
described. What would cause the air leak and how can it be determined?

 

[PES+]

Bad crank seals.....blown base gasket.....like that

If that bottom end survived (the crank) I have parts to fix it....or I think I have a 114 I can do up...I'll look. If he gives you a deal on a new one I may be interested in the carcass