Will tightening head bolts Stop Leak?
In short, at least here in 2020, the answer is no, you don’t have to retorque head fasteners, maybe. If you catch any seeping you can try retorquing the bolts, but if anything gets between the gasket and the block or head surface it may be too late to save yourself from installing a new head gasket.
Should I replace head bolts when replacing head gasket?
A poorly installed gasket leaks and can damage other engine components. All in all, it’s often best to install new head bolts when you work on your cylinder head or head gasket, unless you can be absolutely sure the age and condition of your current ones. It will save you headaches and cash in the future.
What happens if you over torque a head bolt?
Some of the fasteners will stretch and you will have uneven torque. Add heat and pressure and head gasket blows and the head can even warp.
Should head bolts be replaced?
Bolts are designed to stretch as you torque them into place, and when you remove them, they snap back to their original position. Because of this, many standard head bolts are okay to use more than once, as long as they have not been stretched past their spring back point.
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).
What are the torque specs for a Subaru Outback?
Turbo tightening sequence is almost exactly the same. Just change 31 ft/lbs to 36 ft/lbs before the angle tightening sequence. The torque specs for any engine depend on the head, gasket and bolt tolerances combined with engine compression and valving. I would go with the Turbo specs and new bolts unless the bolts you have are good for another go.
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.
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.