nos351wcm wrote:I use a mity-vac pressure/vacuum tester connected to the impulse line and pump the crank case psi to around 15 psi. I spray a water simple green solution on the crank seals, bottom of the cylinder.. Held 15 psi, saw no bubbles.
really, though 15 PSI is a bit more than it should be.. should not be more than 7-8 PSI.. maybe 10, but not more than 10.. as a rule of thumb (too much pressure, can blow out the seals) Also, it should hold pressure for 1 minute (though with your duct tape and cork rig-up it may not) ..
and also you want to do a vacuum test right after, since you have a vacuum side to your pump, see if the seals can hold 14 inches vacuum for 1 minute.. if they can't it's still a crankcase leak,, but that test only tests crank seals (assuming nothing else leaks)
.. better way to block off ports, get some impervious rubber (such as a thick inner tube) cut into a wedge shape (Trapezoid) then you only need to just loosen muffler enough to slip the block off between the exhaust bolts (tightly) and tighten muffler back down to seal it off, and between the carb bolts/studs and carburetor, then tighten down carburetor, everything should be blocked off good then.. but whatever works for you, long as you get a tight seal on the ports, and crankcase can hold pressure (7-8 PSI) (and vacuum - 14 inHg ) for 1 minute...
How poor are they who have not patience. What wound did ever heal, but by degrees? - Iago (Othello Act II, Scene 3)