Technical 8v head torque settings and tighterning order

[DaveMcT]

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.

 

[dave]

Does the 2nd angel 90 degrees and the 3 angle 90 degrees mean a half turn then round again another half turn ?l

no its a quarter of a turn but you must use a dial gauge not just guess it

 

[DaveMcT]

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.

 

[Fiat Palio]

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.

 

[dave]

did you use new bolts into cleaned holes?

 

[Ziggy122]

did you use new bolts into cleaned holes?

Agree'd

They are stretch bolts, they do get longer
Also any crud or oil or anything in the thread holes will cause issues
You risk hydraulic cracking the block if there was some oil in there for example

Ziggy

 

[Brenden Wilson]

I need help please is the torque settings for 1.4 engine are the same with 1.2

 

[varesecrazy]

I need help please is the torque settings for 1.4 engine are the same with 1.2

Hi

This is an OLD thread.. for an old car

What age and model are you asking about?