What is the sequence for tightening head bolts?
Normally you would tighten conventional head bolts in a crisscross pattern in three steps, to one-third, two-thirds, and then to the final torque. Stretch bolts are tightened in a torque-plus-angle sequence.
How much torque is required for tightening the cylinder head?
If an engine produces 1,500 pounds of pressure and the cylinder head has 8 bolts, then each bolt must be tightened to 187 foot-pounds of torque to secure the cylinder head to the block.
What is the final step when torquing down head bolts?
What is the final step when torquing down head bolts? The final step is to twist each bolt a specified number of degrees to stretch the bolts to their design limit. * If a bolt breaks when you are tightening it, you may have over-stretched it.
What is the torque for head bolts?
The manufacturer may state to bring all the bolts to 10 foot-lbs. first, following the torque sequence. In the second step, bring the torque to 20 foot-lbs. In the third step, bring it up to 40 foot-lbs.
Is the 2.5 TD cylinder head tightening procedure and torque?
Not that I’m saying that they’re wrong, the 2.5TD). It doesn’t give the head bolt torque for the TD, every other torque on it though! 130Nm or 95lbf ft max so that tallies with what you suggest. I can’t
How do you tighten head bolts on a Subaru?
Tighten bolts three, four, five and six to 132 inch-pounds. Use the torque angle gauge to tighten all bolts another 90°. Follow the sequence again and tighten them another 45°. Tighten bolts one and two only an additional 45° (turbocharged models only).
Which is the correct order for head bolt tightening?
The Tightening Sequence. The order for tightening is as follows: top center, bottom center, left top, bottom right, bottom left, top right. Follow this sequence for each step.
What kind of head bolts does a Subaru 2.5L use?
The Subaru 2.5L engine is made from aluminum alloy. In order for the heads to properly seal and to prevent warping, a special sequence must be followed when installing the head bolts. Not only is the tightening method critical, so is the order. You will need both inch and foot pound torque wrenches as well as a torque angle gauge.