Leaking seals?

[lone wolf]

I'm at the being driven crazy part now! Ugh! I wouldn't vac check in the water....don't want to rebuild her again. I would pressure check in the water mostly to see if my case is leaking or blocked off exhaust or cylinder gasket is leaking, basically to rule out anything else but the crank seals.

whats the prob vac or pressure now?

 

[SpikeDmax]

Vac.

No bubbles with pressure.

I put sealant around the crank seal last night and got vacuum to hold but checked this morning and it slowly ticked down.

 

[lone wolf]

Vac.

No bubbles with pressure.

I put sealant around the crank seal last night and got vacuum to hold but checked this morning and it slowly ticked down.

flywheel side? put greese and find where the vac leak is wipe off try diff areas till u find

 

[lone wolf]

sounds like seal leaking at crank

 

[SpikeDmax]

yep, FW side. I got the sum##### good and goobered up with sealant so not sure how it's leaking that's why I wanted to do the water dunk test. Will try the grease trick tonight and see what I find. Ucking thing is getting to me!!!

 

[lone wolf]

yep, FW side. I got the sum##### good and goobered up with sealant so not sure how it's leaking that's why I wanted to do the water dunk test. Will try the grease trick tonight and see what I find. Ucking thing is getting to me!!!

yep try to seal the rim first then do the crank tell me what happens maybe its torn from the flywheel key cut.vac leaks tend to be at the crank i dont think pressure with bubbles will help use grease.what u using a mitivac 8500?

 

[SpikeDmax]

Yep, mitivac brake thing from Harbor Freight.

How long should Vacuum last...about 20 seconds without moving? Or should it stay at 10inHg for as long as it's there? What would happen if I run the saw as is with a slight vac leak?

 

[redunshee]

Yep, mitivac brake thing from Harbor Freight.

How long should Vacuum last...about 20 seconds without moving? Or should it stay at 10inHg for as long as it's there? What would happen if I run the saw as is with a slight vac leak?

I like vacuum to hold for 30 seconds, longer is better. Ideally it should hold indefinitely. A slight vacuum leak shouldn't't bother too much. If its bad it should affect how saw idles. Again I prefer no leakdown at all. Hope I'm not misleading you but if I am someone will clarify.

 

[RobertN]

This is from my 024/026 service manual. Guessing yours would be same?

"Operate lever (2) until pressure
gauge indicates a vacuum of
0.5 bar (7.25 psi)."

"Note: If the vacuum reading
remains constant, or rises to no
more than 0.3 bar (4.25 psi) within
20 seconds, it can be assumed
that the oil seals are in good
condition.
However, if the pressure continues
to rise (reduced vacuum in the
crankcase), the oil seals must be
replaced."

Yep, mitivac brake thing from Harbor Freight.

How long should Vacuum last...about 20 seconds without moving? Or should it stay at 10inHg for as long as it's there? What would happen if I run the saw as is with a slight vac leak?