Technical 8v head torque settings and tighterning order

Currently reading:
Technical 8v head torque settings and tighterning order

Don't confuse Nm with Ft-lbs 20Nm is about 15 Ft-lbs

http://www.unitconversion.org/energy/newton-meters-to-foot-pounds-conversion.html

On a 100Lbs (or more) torque wrench, 20Lbs is really not much force - it should click almost immediately.

The head bolts I bought for my HGT came with instructions which said something like:
20Nm then slacken in (reverse order)
20Nm followed by 40nm (2 stages to about 30Ft-lbs)
Then 2 stages of 90 degrees

Follow whatever instructions come with the new set of bolts. Don't reuse old bolts.
Make sure the bolt holes in the block are properly clean. Oil and water collects in there when the heads comes off. Clean the joint faces and blow out the oil and waterways in the head as it will otherwise dribble over the head gasket and affect its sealing.

When the head is in place, use fresh oil on the new bolt threads but dont go mad. Oil or water in the holes can cause a hydraulic lock which can set seemingly correct torques without properly tightening the joint.

Dont forget to be sure the head gasket is the right way around or you will stop the oil supply to the head.
 
Last edited:
It seems the info on bolt packs is not always the same as the manuals. I worked to what my new bolts said to do. When they say 90 degrees they mean turn the spanner 1/4 of a turn. Its hard to guess because of the spring in the bolt and spanner. Ideally, you need to set up a disk marked with 90 degs and a pointer. Also use a breaker bar for more control.
 
Last edited:
I want to ask something.I tightened my head after is was skimmed to 20nm-30nm-90deg and when I wanted to tighten it 90 again it didn't want to move.what can this be.Is it possible that the head is now to thin and the bolts are bottoming out and how can I fix this.
 
Back
Top