What is the tightening torque for fuel injector pipes running from injection pump to injectors. This is a 1986 300sdl with OM603 Engine ( 6 cyl ), the pipes are thin (NOT the Heavy pipes that are found on a 5 cylinder model ).
Thank you Rich

 

For your OM603 engine (1986 Mercedes‑Benz 300 SDL), the commonly cited tightening torque for the thin fuel-injector hard lines (from injection pump to injectors) is 20–30 Nm. Some sources also mention approximately 30 Nm for the later style injectors.