Dolmar 421problem

[woodbutcher56]

Fuel was at different levels each time and after sitting and cooling off the saw idled fine with no fuel added.

 

[dugide]

that was answered in post 78.

Just simple speculation, but maybe the fuel line has a pinhole in the "middle" and as soon as the fuel drops below a certain level the problems evolve.

So it is too bad you didn't refill the saw when the problems started to see if they went away when the tank was full again.

7

 

[woodbutcher56]

Sugarbush
Let me pick your brain.
Since the saw only acts up after being run, is it possible that a leak test might not detect a leak on a cold saw??
Would an air leak cause intermittent problems?

 

[sugarbush]

The way you described the problem, I would suspect an air leak on a crank shaft seal where it seals onto the crank shaft (inner part of the seal that has a spring in it). With a minor leak there, it may only show up after running for a period of time. You could tune that out by opening up the low speed jet a little, but that would be just a band aid effect. But that would also tell you that the saw is getting too much air from somewhere. That leak is usually only detected with a vacuum test if its a minor leak. If you test only with pressure, often that part of the seal will not leak. It should show with a test on a cold engine. i would think the dealer would have done both pressure and vacuum.

 

[woodbutcher56]

I'm really not sure he did either. Pressure/Vacuum The first time I took the saw in he was pretty confident the problem was something floating around in the carb. I'll ask him again if / when he calls this week .

 

[CoreyB]

In my shop if the carb comes off for any reason then a pressure vac test is required. We also have to do a customer sheet that lists the condition like compression psi, spark plug, fuel tater percentage, spark gap test and max distance ect.

 

[woodbutcher56]

Wishing my saw was in your shop!!!

 

[woodbutcher56]

I did a ton of research before buying the 421 really seemed to be a good dependable saw. Only a couple dealers near me. I chose the one I thought would be the best to work with. Could be I made 2 bad choices!!!

 

[dugide]

your kidding, right?

In my shop if the carb comes off for any reason then a pressure vac test is required. We also have to do a customer sheet that lists the condition like compression psi, spark plug, fuel tater percentage, spark gap test and max distance ect.

 

[CoreyB]

your kidding, right?

No why would I kid? Doesn't every shop do that? How else can you ensure giving the customer their equipment in the best working order. It also helps to be able find possible future problems before they cause more damage. Are you saying something people don't do a thorough job?

 

[merc_man]

I'm really not sure he did either. Pressure/Vacuum The first time I took the saw in he was pretty confident the problem was something floating around in the carb. I'll ask him again if / when he calls this week .

Mabe he should put a new carb on if he is so sure its the carb.

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[woodbutcher56]

I thought it was strange ,when I took the saw back the second time he mentioned he had not charged Dolmar for any labor. He said he hadn't really done anything?? At the same time he said he had cleaned the carb and performed a pressure test?? I really don't know what to make of it.

 

[merc_man]

Take it to a different repair shop and have them send him the bill.

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[7sleeper]

Take it to a different repair shop and have them send him the bill.

Do you call that Trump mentatlity...

7

 

[woodbutcher56]

Hey guys ,brief update. 421 is STILL in the shop dealer says he is still waiting for a fuel line!! Visited Nate at Performance Outdoor Equipment yesterday got a good deal on a new PS 5105 . 2 1/2 hours one way but some nice scenery and took the wife and grandson out to eat. I'll be using the 5105 while waiting on the 421. Got some advice from Nate on where to look for trouble on the 421 and will pass it along to my dealer. If my dealer can't fix it I'll ship it or maybe take it to Nate.

 

[CoreyB]

Hey guys ,brief update. 421 is STILL in the shop dealer says he is still waiting for a fuel line!! Visited Nate at Performance Outdoor Equipment yesterday got a good deal on a new PS 5105 . 2 1/2 hours one way but some nice scenery and took the wife and grandson out to eat. I'll be using the 5105 while waiting on the 421. Got some advice from Nate on where to look for trouble on the 421 and will pass it along to my dealer. If my dealer can't fix it I'll ship it or maybe take it to Nate.

Nate is good people. Hope your local shop can get the 421 sorted out.

 

[backhoelover]

i think i remember @fordf150 send me a tech bulletin about that fuel line. i could be wrong

 

[woodbutcher56]

Got an email from my dealer yesterday. He said he replaced the in tank fuel line and tank nipple. He said he would run the saw yesterday and today to make sure it was good to go. He says since it is being turned in as warranty work Dolmar wants to know exactly what fuel , oil and mix ratio I am using???

 

[Sepia]

Looks like a red flag. I would reply verbatim what you owner's manual states you should use for fuel.

 

[woodbutcher56]

That's what I was thinking!