What are the torque specs for ARP head studs?
ARP recommends using 3 equal steps to achieve 245 ft-lbs of torque on their 6 Liter (Litre) PSD head studs, but here at Fleet Service Northwest, we use a 7-step process, starting at 65 ft-lbs and increasing the torque each step by 30 ft-lbs, allowing us to avoid inaccurate torque due to static friction, and ensuring …
Do you torque ARP head studs?
Do I need to re-torque my head bolts or studs? If you follow the ARP installation instructions, there should be no need to do a re-torque. However, it may be necessary under certain circumstances if the gasket manufacturer’s instructions require it, particularly if a fire ring has been installed.
Do you have to torque ARP head studs?
You really don’t need to re-torque them as long as you followed the specs provided by arp to begin with. I have never seen anyone have an issue when they didn’t re-torque their head studs. Mtber, yes I torqued them down in 3 equal steps and in proper sequence according to the service manual.
What happens if you don’t torque a bolt?
Insufficient torque When you apply exactly the right amount of fastening force, you can rest assured that the bolt will transfer the ‘hits’ as well as the load of the belt to the bulk of the engine, which will absorb them. This, in turn, will lead to incorrect belt tension and, eventually, to belt and/or engine damage.
What happens if you over torque a bolt?
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.
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.
How big is the head bolt on a Subaru Outback?
(4) Retighten all bolts to 95 N·m (9.7 kgf-m, 70.1 ft-lb) in alphabetical order. CAUTION: If the bolt makes stick-slip sound during tightening, repeat the procedure from step (1). In this case, the cylinder head gasket can be reused.
What are the torque specs for Subaru head bolts?
When you torque subaru head bolts to the final torque specs, you’re actually using angle torque (That’s why you turn them all 90* once, and then 90* again after those low torque numbers) I would assume you are somewhere around 80 ft lbs on the center bolts and 70 ft lbs on the outer bolts by the time you’re done with your angle torque steps.
How to tighten cylinder head bolts in Subaru?
Apply a sufficient coat of engine oil to the washer and bolt thread. 3. Tighten all bolts to 29.5 ft/lbs (40 Nm) in alphabetical order as shown in Figure 1. 4. Tighten all bolts to 70.1 ft/lbs (95 Nm) in alphabetical order. If the bolt makes a stick-slip noise (a squeaking sound) during tightening, start over from Step 1.