BTW, I should have posted this earlier.
Here's the pin and the two cap screws.
The two smaller threaded holes are the jack threads.
The pin fits into a shallow recessed area, or "socket", within the transmission's front clamping collar on the Pre- "A" transmissions.
(while this socket is rather shallow, we usually have to fight a bit of corrosion here when removing the two bolt helmet pin.... hence the "jack bolts")
(seperate steel bearing box pre- A transmissions)
The "A" and later transmission clamping collar is integral with the main drive gear bearing box.
The helmet pin fit is indentical between the two styles.
As shown in either style above, these are the two threaded holes that are at risk if the wrong length cap screws are used.
(a screw that is too long will actually break through the aluminum casting)
This breach will allow water to enter the drive shaft and bellows area.
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That pressure/vacuum tester is by Tom Green. He's a good guy, and if you were to have any trouble, Tom will take care of you.
Be sure to drain the gear oil for the Pressure Leak Down test. The Vacuum test doesn't care.
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Unsolicited tip:
When removing an AQ series Volvo Penta drive, remove the transmission
first, then disassemble or remove the other components if need be.
When going back together, install the Intermediate housing, suspension fork, etc, and the transmission
last.
Often there's no need to remove the Intermediate or Suspension Fork comonents.
However, if there is a need, I still recommend the above.
.