IAI America RCP4W - Manual (Page 66)

4. Maintenance Inspection
60
21) Insert a hex wrench to the holes the grommets were taken out of to tighten the four hex socket head
cap screws to hold the motor cover (at the circled places) with it.
Hole that the grommet
was taken out of
Hex Wrench
Tightening Torque : 49.8N•cm
Tool to use: Hex wrench 2mm-sized