I really suggest you not use the ps nut to turn the engine... I have seen how incredibly tight they can get when you do that... Had to heat it with Oxy/acet and shoot with WD40 three times to get it where a big hammer would take it off..and this was off the car working on it... a real pain... use a 27 mm deep socket on the crank bolt like the manual says.... If you insist on using it... it will help to take out the glow plugs so you don't have so much force required to turn it over.... Greg