Stihl MS180 - High Engine Vibration?

[SteveSr]

Hello,

I just received an MS180 to fix the usual fuel & oil leak(s). I test ran it and it seemed to run and cut fine. I did, however, notice a large amount of engine vibration.

How much vibration? Well, I found the top pin on the clutch cover closest to the muffler had ultrasonically welded itself to the main housing. I also found that the throttle rod had peened the carb throttle lever such that it wouldn't come loose without significant contortions and force.

Any suggestions as to what to look for for the source of the vibration? The only things that come to mind are the collected crud on the flywheel (both sides). Anything else I should be looking for?

Thanks,

Steve

 

[smokey7]

I've seen twisted cranks cause some funny stuff. However they usually don't run for long. Unless not tweaked much. I am also aware of the rod for piston crank are very weak and could cause lots of issues if it base bent some. Other then that I couldn't tell you.

 

[Full Chisel]

MS170/180 vibrating like crazy...sounds normal to me.

 

[HarleyT]

Ultrasonically?

 

[SteveSr]

Ultrasonically?

Well, maybe not ultrasonic but the idea is the same. Vibration causes friction which generates enough heat to melt and weld the plastic pieces together.

 

[SteveSr]

MS170/180 vibrating like crazy...sounds normal to me.

I recently worked on a MS170 and don't recall the same vibration issue. Granted that this engine is different (+2cc larger) than the 170.

 

[HarleyT]

Well, maybe not ultrasonic but the idea is the same. Vibration causes friction which generates enough heat to melt and weld the plastic pieces together.

Pic?

 

[Rockjock]

Thats no vibration! That is the awesome 17,500 rpm's burred in oak that you be feeling!
Check the rubber av mounts. The linkage might be from a loose carb, or the 17,500 rpm's of pure powa!!!!!

 

[Full Chisel]

I recently worked on a MS170 and don't recall the same vibration issue. Granted that this engine is different (+2cc larger) than the 170.

Every single one I have run buzzes like a damn bumblebee. I hate the way they vibrate and sound...very poor quality saws.

 

[SteveSr]

Every single one I have run buzzes like a damn bumblebee. I hate the way they vibrate and sound...very poor quality saws.

One would think that Stihl would know how to balance an engine.

 

[HarleyT]

Have you looked at the flywheel?

 

[HarleyT]

I see, you pulled it looking for the vibration?

 

[Full Chisel]

One would think that Stihl would know how to balance an engine.

My bet would be bent con rod. That series of saw is known to have weak rods...we have seen them bent from being pulled over in a hydrolocked condition.

 

[HarleyT]

My bet would be bent con rod. That series of saw is known to have weak rods...we have seen them bent from being pulled over in a hydrolocked condition.

Hyrdolocked with 3 feet of pull rope!!!

 

[chainsaw-57]

Check the four screws in the bottom that hold the engine to the housing.

Larry. HOS

 

[SteveSr]

I see, you pulled it looking for the vibration?

I haven't pulled it (or the clutch ) yet but it looks good from the outside (no broken fins).

 

[ChoppyChoppy]

Every single one I have run buzzes like a damn bumblebee. I hate the way they vibrate and sound...very poor quality saws.

Agree. They are almost as **** as a $99 Wild Thang.

 

[ChoppyChoppy]

One would think that Stihl would know how to balance an engine.

But the 170/180 is the complete bottom of the drawer lineup of Stihl saws. Basically sold to uninformed customers thinking Stihl = good.

 

[blsnelling]

Be careful working on that saw! These are from two different saws.

 

[SteveSr]

Be careful working on that saw! These are from two different saws.View attachment 568583 View attachment 568584

@blsnelling , Thanks for the reminders. I think I remember seeing these a while ago. What is the best thing to use as a piston stop? I normally use rope jammed into the cylinder. I am assuming that the Stihl piston stop put the hole in the piston in the photo. What bent the rod?