Stihl 034 issue

[md1486]

hi guys
I have a stihl 034 who give me a lot of troubles.
1. Piston was cooked so I put a new P&C (cheap AM) in it. I also rebuilt the carb, new fuel line, impulse line, intake boot (all OEM) and clean exhaust.
After a lot of tuning, the saw ran good for maybe 3-4 gas tank.
2. Now saw smoke like crazy and I cant tune it right. I have started at 1 turn each and all the variant, nothing seems to work.
Was could I do next ? What could be the issue ? I dont have pressure/vac tester.
I joint a video of the saw. Thanks,

 

[cuinrearview]

Looks like your bar oil may have found it's way into the crankcase

 

[Tobystihl]

hi guys
I have a stihl 034 who give me a lot of troubles.
1. Piston was cooked so I put a new P&C (cheap AM) in it. I also rebuilt the carb, new fuel line, impulse line, intake boot (all OEM) and clean exhaust.
After a lot of tuning, the saw ran good for maybe 3-4 gas tank.
2. Now saw smoke like crazy and I cant tune it right. I have started at 1 turn each and all the variant, nothing seems to work.
Was could I do next ? What could be the issue ? I dont have pressure/vac tester.
I joint a video of the saw. Thanks,

I'm with Cuinrearview, it does look like she's sucking chain oil (if it's not your fuel mix !?! ) you could check the tension of the crankcase bolts, they may nip up and cure it, failing that sadly it's a strip down job!

 

[pioneerguy600]

Bar oil. It would be burning diesel to make that much smoke and the engine would not rev on diesel.

 

[md1486]

I'm with Cuinrearview, it does look like she's sucking chain oil (if it's not your fuel mix !?! ) you could check the tension of the crankcase bolts, they may nip up and cure it, failing that sadly it's a strip down job!

Do I have a remove clutch and flyweel to reach crankcase bolt ? Never have to deal with those yet

 

[md1486]

Bar oil. It would be burning diesel to make that much smoke and the engine would not rev on diesel.

Nah no diesel. This is the same mix as my others saws. ethanol free gas 45:1

 

[cuinrearview]

Do I have a remove clutch and flyweel to reach crankcase bolt ? Never have to deal with those yet

Been a minute, but I believe just the PTO side

 

[md1486]

Could it also be metering lever set too high or it would be others syndroms in that case ?

 

[DND 9000]

No, that can`t be the metering lever. If that lever would be that high the saw would flood immediately.

 

[md1486]

No, that can`t be the metering lever. If that lever would be that high the saw would flood immediately.

Thanks, one less thing to investigate

 

[Tobystihl]

Been a minute, but I believe just the PTO side

Yes just the pto side!

 

[md1486]

I tried it again today, she smokes like crazy for about 20sec at wot and then she ran ok..if this is bar oil leaking in the crankcase, can I run it like that as a backup saw or i may damage something? I would remove muffler screen for sure since she spills a bit of oil from exhaust

 

[cuinrearview]

In the short term you'll foul plugs and piss off liberals. Eventually the cooked oil will cause problems in the top end. I would make a plan to overhaul it.

 

[md1486]

In the short term you'll foul plugs and piss off liberals. Eventually the cooked oil will cause problems in the top end. I would make a plan to overhaul it.

I’ll check the tension of crankcase bolt but if it doesnt solve the issue i really dont think im gonna strip down this saw again since there is a cheap AM top end in it

 

[cuinrearview]

I’ll check the tension of crankcase bolt but if it doesnt solve the issue i really dont think im gonna strip down this saw again since there is a cheap AM top end in it

You should find a guy on here selling a good used OEM top end for cheap

 

[md1486]

Looks like your bar oil may have found it's way into the crankcase

A few months old post but Im back at repairing this damn 034. You were right, cylinder is full of bar oil. I looked at the 3 crankcase bolts on the PTO side. They seems tightly screwed. Do you see something else in the pic that look wrong and causing the problem ? What is the little hook for in the first pic, it goes nowhere.

Also since clutch is remove and I have seal on hand, is this a big job to change seal on the PTO side ? Do I have to crack the crankcase ?

I change recoil spring and starter rope but can't pull the rope, could this be because of bar oil in the cylinder ? There's a ton of it.
Thanks !

 

[BuckthornBonnie]

Lots of issues here. Your oil worm gear is shot. At least the drive spring, that is.

Leaking case gasket (if that’s your issue) requires a case split, yes.

 

[cuinrearview]

Lots of issues here. Your oil worm gear is shot. At least the drive spring, that is.

Leaking case gasket (if that’s your issue) requires a case split, yes.

This. The hook that goes to nowhere hooks on the clutch drum. If you look at the rim of it you'll see a notch for it to sit.

 

[md1486]

Lots of issues here. Your oil worm gear is shot. At least the drive spring, that is.

Leaking case gasket (if that’s your issue) requires a case split, yes.

Thanks, I guess I just broke the spring in removing the clutch. Dont have the tools, just rope in cylinder and ratchet

 

[BuckthornBonnie]

Removing and installing a pto seal isn’t that difficult. However, you may have more problems if you have oil in the crankcase/cylinder. That would require a case split to properly fix. I would replace the bearings and seals during assembly.

You could get a higher quality top end as well and have a heck of a saw. $$$, though, and a lot of learning along the way.