Stihl M181C Leaking like buggery

[flanagaj]

So I purchased a saw off FB and buy the time I got home, the mat in the car footwell had a considerable amount of oil leaking.  It's obviously chain oil, but given how much leaked out in one hour, I suspect the tank will be empty by morning.   Is there anything that could be obvious to look for.  I can return the saw, but if it's something minor then I'll probably just hang onto it.

[pleasant]

Duck bill vent valve missing? Cap not on correctly? Hole in tank body? Oil feed pipe split, damaged, not on properly or missing?

[flanagaj]

Just now, pleasant said:

Duck bill vent valve missing? Cap not on correctly? Hole in tank body? Oil feed pipe split, damaged, not on properly or missing?

Ok, thanks.  You've given me some pointers.

[kram]

Try rinsing it out with fuel. If it leaked with oil, fuel will piss out and tell you exactly where the problem is.

[peatff]

Could just be the cap seal, lay it on it's side.

[Logdaft]

Could be the oil hose, that`s where mine was leaking oil from, replaced the hose & it`s been fine ever since.

 

 

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Oil hose Genuine Stihl Part OEM Part No. 1139 647 4000 Suitable for the following Stihl Machines: MS 181, MS 181 C, MS 181, MS 181 C, MS 211, MS 211 C, MS 171, MSA 160 C...

 

[flanagaj]

It looks like it's leaking from underneath.  Eg, need to replace the oil hose.

[spudulike]

It will be the oil pipe that sits on the underside of the machine. If you undo the spring AV mount, you should be able to chock the handle assembly to get it out of the way to replace the pipe.

This is pretty common once the machine has seen around 5 years use.

[NJA]

I had this with a 181, mice had chewed through the oil pipe.  The cap leaks as well so check its not running from the cap and just dripping out the bottom.