Pressure test, bubbles at the base

[vw splitter]

I have put a new piston and cylinder in a 575xp and did the base gasket delete. I used Permatex Motoseal gasket maker between the cylinder and base. 24 hours later doing a 10 psi pressure test, the pressure dropped 1 psi in 2.5 minutes. There were a few tiny bubbles at the base. Do I need to take this thing apart and go again on my base seal over a few tiny bubbles?

 

[Ronie]

If it was my saw I'd re-do it but I'm pretty sure that 1 psi in 2.5 minutes passes the test.

 

[Ronie]

From the workshop manual.
Pump up the pressure to 80 kPa (0.8 bar).4. Wait 30 seconds.5. The pressure must not fall below 60 kPa (0.6 bar).

https://www.hlsproparts.com/v/vspfiles/downloadables/WM_570-575XP-2004_1140291-26.pdf

 

[David Boyd]

And this test is done at how many degrees Kelvin?

 

[Wood Doctor]

I have put a new piston and cylinder in a 575xp and did the base gasket delete. I used Permatex Motoseal gasket maker between the cylinder and base. 24 hours later doing a 10 psi pressure test, the pressure dropped 1 psi in 2.5 minutes. There were a few tiny bubbles at the base. Do I need to take this thing apart and go again on my base seal over a few tiny bubbles?

You may want to install that base gasket and forget the sealer. The latest Service Manuals for the 550 XP Mark II and the 575 XP do not ask for any sealant to be applied as long as the gasket is there.