GS750ES 1983: "VALVE ASSY, PISTON OIL CONTROL" missing

[dpascal]

In the attached drawing you can see part 33 (called VALVE ASSY, PISTON OIL CONTROL).
I wasn't able to locate it anywhere. It's not in the area of the oil pan, nor is it in the area of the oil filter. It's not even in the area of the strainer (the part with the mesh that filters metal chips).
Where is it supposed to be ?
http://www.alpha-sports.com/suzuki_parts.htm?fpg=/spst/1983 GS750ES/36.htm

 

[Nessism]

Not sure but there is something similar showing on page 3-63 of the factory manual called an oil jet.

 

[dpascal]

Yep ! Thanks !
To be on the safe side, Once I finish to rebuild the engine, I'll let the it run on the table with a battery connected to the starter (without camshaft cover) to make sure oil pressure if OK and it reaches the upper part of the engine.