How much torque should a head gasket have?
Torque Sequencing Many cylinder heads require multiple torque sequences to achieve proper tension. For example, a 10-bolt cylinder head may require you to tighten them all first to 42 foot-pounds in a specified order, then to 75 foot-pounds in the same order.
What’s the torque on head bolts?
1. Tighten each bolt to 7-9 foot pounds of torque. 2, Tighten each bolt to 12-14 foot pounds of torque.
Can you reuse Subaru head bolts?
They are reusable, even subaru says so. You have very strong steel bolts in aluminum heads with aluminum block, the threads would give out before the bolts would.
Can you over torque a head gasket?
When you overtorque above 15% of recommended which in this case would be about 95 ft/lbs you basically turn the fastener into a rubber band. Add heat and pressure and head gasket blows and the head can even warp. …
Do Subaru head bolts need to be replaced?
When it’s done properly, the head bolts shouldn’t be permanently stretched to their yield point, as they are with the TTY method. For this reason, it may not be absolutely necessary to replace the head bolts. In fact, Subaru service information does not specify new head bolts as part of a head gasket repair job.
What happens if you over torque?
The Importance of Proper Torque Typically, an under torqued bolt will deform and be unable to provide as much clamping force as needed. An over torqued bolt will break.
How many miles does a Subaru head gasket fail?
Some Subarus have a reputation for eating head gaskets at a very low mileage. Where did this reputation come from? Though there was never an official Subaru head gasket recall, the problem is pervasive enough where it can be expected that certain original head gaskets will fail between 100,000 and 150,000 miles (160-241k kilometers).
How do you replace head gaskets on a Subaru?
Removing the engine makes it much easier to extract the head bolts in particular, which are very long and won’t clear the body with the engine sitting normally inside the engine bay. To reach the head gaskets, a mechanic has to tear the engine down to the short block. Both gaskets are typically replaced at the same time.
Can a Subaru Tribeca have a head gasket failure?
Head gasket failures are less common on the Subaru 3.0 and 3.6 L H6 models like the Tribeca. They are also rare on the turbo models such as the turbo Baja, Impreza WRX, and Impreza WRX STI. The black carbon deposit on the bottom of cylinder #4 (right) is a textbook symptom of a head gasket leak.
What’s the torque procedure on a Subaru Outback?
From what I recall, the torque procedure for the 2.5 SOHC (phase II) engine was specifically created to seat the revised gaskets and minimize leaks. Out of an abundance of caution, I looked at the torque procedure for the turbo motor and it’s different, not surprisingly.