Thread: Torque values for 300 tdi cylinder head

Originally Posted by bondb1

But does any one out there know if there is torque values that may be used in place of the angle method .

When I did mine a few weeks ago, I made a small dial. Someone suggested (JustinC I think) the obvious and use the points (or flats) of the bolts to do the 60 degrees. Here's the thread.

Doesn't help with the 40 degree ones though.

Hey , thanks for the info , just a quickie I think from memory that there wasn,t any 40 degree angles for the torque I believe it was an initial 40 NM after the bolts had been lightly tightened to contact the head then 60 degrees twice in two lots of torque and then a final 20 degrees on the longer bolts .
Perhaps you have some info that I don't please could you let me know what your torque procedure was also did you use new head bolts the Land rover manual says they may be used 5 times but I'm thinking just to get new ones and be done with it .
Regards Jon.

New bolts are a good idea.

Re 60deg increments... I just paint a line from the center of the bolt head towards the front using liquid paper or something on all bolts. Then it's easy to guage the 60deg turn and you can clearly see when they are all done. That is after the initial tension stage of course.

Also dont forget to make sure the threaded holes in the block are clear and dry. Having coolant trapped inside when you tighten them can crack the block.

Also good to have two people to place the head on the block. It's kinda heavy and easy to damage the bottom of the head on the locating dowels on the block.

Torque values are too unreliable when tightening bolts to relatively high tensions. At high tensions, torque to overcome friction increases dramatically and variations in friction result in large variation in tension.

Angle of rotation is easy. I use a cheap 1/2" square drive angle indicator. I have seen someone use a piece of cardboard with the angles drawn on it, and it worked reasonably well.

Originally Posted by Bush65

Torque values are too unreliable when tightening bolts to relatively high tensions. At high tensions, torque to overcome friction increases dramatically and variations in friction result in large variation in tension.

Angle of rotation is easy. I use a cheap 1/2" square drive angle indicator. I have seen someone use a piece of cardboard with the angles drawn on it, and it worked reasonably well.

Yes very true with the torque values being unreliable , good point where did you get your 1/2" square drive angle indicator from.
Regards Jon.

Originally Posted by bondb1

60 degrees twice in two lots of torque and then a final 20 degrees on the longer bolts .

Sorry. I should have checked them first. Yes, the values you have are correct.