Ms460 leaking bar oil behind clutch, sealing gasket and pickup tube leak free?

[cumminskta]

Hi All,

I have a Ms460 that appears to be leaking bar oil from behind the clutch. I pulled the clutch off, cleaned off checked, and reseated the pickup tube, sealing gasket and cleaned the pump area. I rebolted the pump, filled reservoir with oil and let it sit on the bench for the day. Came back to no leaks. Confirmed gaskets in place and not obvious issues with pump unit or cracks in rubber.

I put the saw back together and ran it without cutting for a few minutes (high revs to engage clutch/pump) Oil coming off chain as normal. Got back inside and found more oil inside the housing like it was leaking. Couldn’t find any specific points of leaking. Bar ports not blocked and was lined up with oil outlet.

Any ideas? Could this be caused by the saw running and not actively cutting?

Thank you!

 

[Dennisthemenace]

Hi All,

I have a Ms460 that appears to be leaking bar oil from behind the clutch. I pulled the clutch off, cleaned off checked, and reseated the pickup tube, sealing gasket and cleaned the pump area. I rebolted the pump, filled reservoir with oil and let it sit on the bench for the day. Came back to no leaks. Confirmed gaskets in place and not obvious issues with pump unit or cracks in rubber.

I put the saw back together and ran it without cutting for a few minutes (high revs to engage clutch/pump) Oil coming off chain as normal. Got back inside and found more oil inside the housing like it was leaking. Couldn’t find any specific points of leaking. Bar ports not blocked and was lined up with oil outlet.

Any ideas? Could this be caused by the saw running and not actively cutting?

Thank you!

It's coming off the bar and chain, it's normal, all saws get a bit of oil under them. Also if you put them away with a fair bit of oil in the tank changes in temperature can cause a bit of a leak out the breather. For these reasons if I put a saw into storage for a while I drain the tank and stick a rag under it

 

[trains]

Just to clarify.
if you leave the oil reservoir with bar oil in it, its not the breather that it leaks out, but just the normal oil passage of the pump/ bar mount pad oiler hole, into the bar, and then leaks down over everything.
Its the changes in atmospheric pressure/ temp that acts on the air inside the reservoir, and in low pressure situations, draws oil out, then in high pressure situations, the breather lets air back into the reservoir and that causes the pumping action, thus they leak over time.

 

[Dennisthemenace]

Just to clarify.
if you leave the oil reservoir with bar oil in it, its not the breather that it leaks out, but just the normal oil passage of the pump/ bar mount pad oiler hole, into the bar, and then leaks down over everything.
Its the changes in atmospheric pressure/ temp that acts on the air inside the reservoir, and in low pressure situations, draws oil out, then in high pressure situations, the breather lets air back into the reservoir and that causes the pumping action, thus they leak over time.

Yes, I agree with you on that, especially with the Stihls however all older husqys, 288 181 & 268 seem to go both ways. I can't be bothered fighting them so generally just don't leave much oil in the tank.
By the way, did you ever get the 881 you were thinking about a year or two ago?

 

[trains]

Yeah, its awesome.
if I need the 660 and 36, I prefer the 881 and 36.