What happens when a head bolt is over torqued?
If the bolt is over-torqued and stretched beyond its limit, this exceeds its yield strength which means it can no longer maintain the needed clamp load and must be replaced. One way to overcome the huge variable of friction when tightening fasteners like head bolts is to use a technique called torque angle.
Can a head wrench break for no reason?
Consequently, Head Bolts can break for no apparent reason leaving you with a leaking or blown head gasket. Many people never check the accuracy of their torque wrenches.
Can a TTY bolt be tightened with a torque angle?
So the point of all this besides educating you on fasteners, is that any bolt can be tightened with a torque-angle specification, but that does not mean that it necessarily is a TTY bolt. You should also not assume that a TTY fastener will always be torqued with the torque-angle method.
Why do head bolts need to be inspected?
Problems with head bolts are the number one cause of installation-related gasket failures. Consequently, No gasket is going to seal well if you use the wrong procedure to tighten the head bolts. So, Make sure the torque specifications you are using are the latest, up-to-date numbers.
When do you re torque the head bolts?
Tighten each head bolt in the same sequence as before while the engine is still warm. If the engine has an aluminum cylinder head or block; however, do not re torque the head bolts; until the engine has cooled back down to room temperature.
What are the torque specs on a Pontiac?
Pontiac Engine Torque Specs Bolts or Parts Lube or Sealer Torque to: Rocker Studs (screw-in) Engine Oil 55 ft-lbs. Rocker Arm Nuts (Non-Adjustable Rockers) Assembly Lube 20 ft-lbs. Oil Pump Bolts Engine Oil 30 ft-lbs. Oil Pump Cover Bolts Engine Oil 15 ft-lbs.
Consequently, Head Bolts can break for no apparent reason leaving you with a leaking or blown head gasket. Many people never check the accuracy of their torque wrenches.
What happens when a bolt is over torqued?
A correctly-tightened bolt shares the preload with workpieces. An over-torqued bolt that is stretched beyond its elastic limit is severely weakened, diminishing its effective load capacity.