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Quick vac test question


billpierce
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Have a 028 super on the bench. Just fitted new piston, as it was goosed. Cylinder cleaned up nice.

 

It runs sweet for 5 mins then starts screaming it's head off. So I suspect crank seals.

 

Pressure tests fine but won't hold a vacuum.

 

Tips on locating a vac leak please? Grease?

 

 

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Sounds like seals to me. Pressure tends to show splits and holes in rubber more so than vacuum. I don't think you will have a decomp valve on that saw type. Best to whip the clutch, drum etc off the saw, turn it on its side and give it some vacuum and when it leaks, run some heavy oil around the seal and see if it begins to alter the vacuum leak-down.

If it doesn't, try the flywheel side in the same way.

The classic sign of a vacuum leak is that the saw will just not snap down to idle and will hold on to revs. The saw will also have a tendency to stall after a while idling.

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