did you do a search on the subject.

I am sure that some one went over that topic before.

It should be easy to do if you got it all apart.

remove the fuel lines and remove the injectors.

Torque them down to spec. I dont have my cd with me but if you cant find it I can look it up later.

I would just leave them alone if there is nothing wrong with them. You can run diesel purge through them at alot less money and hassel.

IF you bought them already why not put them in.

THe ratchet is 27mm and torque of of memory is 55 lbs or 75 Nm.

I changed glow plugs on my 603 and elected to leave the injectors alone.

good luck

bob