What is Torque sequence?
Bolt tightening sequence, or torque sequence, is defined in the torque tightening procedure. Flange joints are torqued tight with the help of a torque wrench (manual or hydraulic). Torque bolts and nuts in a “CRISS-CROSS” sequence using a minimum of three torquing passes and the maximum bolt stress as defined.
Why is torque sequence important?
It’s the order in which you tighten the fasteners for a specific part, such as cylinder head bolts in an engine. It matters because it keeps pressure applied as evenly as possible so as not to warp parts or overstress the fasteners. It’s an order if when to tighten certain bolts in a pattern.
What happens if you dont torque to spec?
Insufficient torque Engines that are running, tend to vibrate. In the case of insufficient torque, it’s the stud or the bolt itself that suffers all the impact, causing it to shear. Alternatively, the engine’s vibrations can cause the bolt or nut to come undone, displacing the tensioner.
How much torque is too much?
Most 2WD road cars – even with large grippy tires – can’t handle more than 400-500 lb/ft of torque. AWD cars can handle as much as 600 lb/ft without losing traction.
What will occur if a wheel is tightened beyond torque specifications?
If the Lug Nuts are tightened beyond their design limit, the wheel stud or bolt can permanently stretch (fatiguing beyond its designed elastic range) or even break during installation.
What happens if you over torque a head bolt?
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. 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.
Can you use a head gasket twice?
There is a registered person. You can reuse the gasket if the engine doesn’t start and the gasket is returned to the cylinder bank.
How do I know if my head gasket sealer is working?
The first thing you’ll notice is that the engine starts to overheat, you may see white smoke from the exhaust, and there may be some engine misfires. Furthermore, if the oil looks milky, if there are bubbles in the cooling system, or if the coolant is missing without a visible leak, you may have a faulty head gasket.