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#Post#: 89425--------------------------------------------------
MS391 leaking bar oil
By: Medic1 Date: September 6, 2022, 6:51 pm
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Hi all. I have an MS391 (2017 mfg date I believe) that leaks
bar oil considerably during and after use. I cleaned the bar
and oil holes and looked to see that the hoses were connected as
well as checking the pickup. It did have a light weight Husky
bar oil in it when I got it. I replaced it with Stihl Platinum
which slowed the leaking some. I turned the oiler down as well
but still have the same results. Not sure what are where to
check now any help would be appreciated. Thanks!
#Post#: 89426--------------------------------------------------
Re: MS391 leaking bar oil
By: pleasant Date: September 7, 2022, 3:29 am
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Best thing to do would be to remove the bar/chain/clutch cover,
clean any residual chain oil from that area, place it on some
new brown cardboard, start the engine and leave it on idle and
watch the oil flow and where it's coming from. If it is only
coming from the feed pipe, and nowhere else, I would advise
changing from the Synthetic Stihl chain oil (in the silver
bottles) to a traditional stringy mineral type oil. The Stihl
oil works in the opposite way to the traditional mineral oils,
and is designed to be very fluid when flowing to the bar, but
thickens up when agitate by the rotational action of the chain-
whereas mineral oils stay thick and stringy when flowing slowly
and become more runny when hot and are on the chain.
If you have a saw with a very generous flow adjustment, then
Stihl oil can flow out too easily and you do get a lot of
waste/leakage.
#Post#: 89433--------------------------------------------------
Re: MS391 leaking bar oil
By: Cut4fun Date: September 10, 2022, 6:18 am
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Figure it out?
#Post#: 89465--------------------------------------------------
Re: MS391 leaking bar oil
By: Medic1 Date: September 17, 2022, 1:30 pm
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I still haven't figured it out. I am also not sure what the
"mineral type" bar oil is you are referring to. I am not
certain that I have seen that in the U.S.
#Post#: 89466--------------------------------------------------
Re: MS391 leaking bar oil
By: Chainsawrepair Date: September 18, 2022, 5:15 am
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[quote author=Medic1 link=topic=7866.msg89465#msg89465
date=1663439428]
I still haven't figured it out. I am also not sure what the
"mineral type" bar oil is you are referring to. I am not
certain that I have seen that in the U.S.
[/quote]
I think he is talking about using the regular dyno bat oil. Like
stihl orange bottle or any bat oil at TSC, Menards, Rural king
etc. Cam2. Poulan etc.
I bought this last time at RK 6.99 a gallon. Usually Cam2 but
they were out so this. All were good.
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