AlexTheGrater
ArboristSite Lurker
Yep, the fuel lines are dust...And it's perfect, still got the machining marks on the rings, just a few tankfuls, I would guess!
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Yep, the fuel lines are dust...And it's perfect, still got the machining marks on the rings, just a few tankfuls, I would guess!
View attachment 352940
On a S25DA auto oiler diaphragm and gasket, which goes on first?, as the 25, 25DA, & S25CV IPLs have it both ways...or does it matter?
Just spent an afternoon going completely through this little saw, and it about kicked my azz during pressure testing. New seals, gaskets, then a cylinder stud leaking at the bottom/backside of the case, but I still couldn't stop the gauge needle in its tracks. I never could locate the small leak, I guess I should have bubble checked the oiler fill cap, in case the crankcase gasket is leaking internally. I checked the outside seam of the case and cylinder flange, they were fine. The saw idles and cuts great for its size.
The 2 bolt carb flange up top has through holes into the carb box & into the crankcase, so those test flange bolts kept seeping.
The auto oiler is impulse driven, but that should be isolated from the crankcase, correct?
Any comments or tips from past S25 testing would be welcomed!
The oiler gasket goes against the oiler housing if I remember right. If you want to pressure test it, you really need to remove the oiler and block of the impulse hole in the crankcase, just like you need to on a 3400.
Mark, Glad to see you back. Your knowledge sure was missed.The oiler gasket goes against the oiler housing if I remember right. If you want to pressure test it, you really need to remove the oiler and block of the impulse hole in the crankcase, just like you need to on a 3400.
Got to love that pull handle.
Got to love that pull handle.
The oiler gasket goes against the oiler housing if I remember right. If you want to pressure test it, you really need to remove the oiler and block of the impulse hole in the crankcase, just like you need to on a 3400.
Bob, your getting me somewhat confused. Your leaking air at the oiler correct?
I know that I have a block off plate made up for when I vac test a 3400 to completly block off the impulse passage on them.
You might have to do the same thing on the S25's. To be honest, I dont think I ever vac tested one of them.
Some folks around here put way too much faith in having to have a vac test hold for hours and hours. A slight drop is no problem on them. Hell a Homelite 330 has a hole drilled under the reed passage on them. There is no way to vac test one of them without plugging that off, but they run fine with a built in vac leak.
Are you still working on the S25D? Are you sure its a manual or auto oiler yet?
BTW, check your voice mail.
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I'm thinking about JB welding or packing that slot closed, but don't want to blow out a $20 obsolete diaphragm!
Any other suggestions?
I know this is an old thread, but found it while searching for an over oiling problem on an old S25A.
This was the same "slow leak" issue with the S25DA I just finished, but in operation (saw is running & oiler put back on), there still is direct passage back through to the crankcase from the oiler. If there wasn't, you wouldn't have to blind the hole. There is a small slot in the oiler body that feeds a bit of the impulse to the chamber below the diaphragm, then the main impulse flow goes to the top or back side (farthest away from the engine). Kind of a balanced pressure on the oiler diaphragm.
The makes no sense, and can't see how it keeps from burning some bar oil. This little saw runs way too much oil through it, flings it all over from the bar & chain. I think it's because some impulse is feeding into the chamber bottom, which has the oiler plunger rod & bore at the back side....it doesn't smoke much though.
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Here's an oiler body #11169 on FleaBay, mislabeled as the newer 10177, that has a vent hole in the bottom of the inside of the chamber, must have been an early style...a bit of a CF on oilers by Poulans part right there. Notice that it doesn't have the slot cut by the impulse hole though.
View attachment 353746
I'm thinking about JB welding or packing that slot closed, but don't want to blow out a $20 obsolete diaphragm!
Any other suggestions?
Had a sec to run out and tear apart for pic.removed the crumbing sponge inside.
Yea that oiler body is mine on fleabay, I have several complete ones also for my saws, I received that particular one with the multiple part#'s on the package. I will have to go pull the ones I have and compare them.
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