Hi, anybody know the torque wrench settings etc,for the cylinder head bolts???

I have a 1989 2.8 turbo d fourtrak.

just had a close call with a back plate bolt working it's way loose and falling to the bottom of the timing case and stripping half the cam belt, causing the timing to slip and bending all the exhaust push rods HAPPY DAYZ.

Thanks
Stressed myke.