aero3113 Posted July 17, 2009 Report Posted July 17, 2009 I want to do a retorque of my head bolts on my P-20, what is the torque value? Quote
Plymouthy Adams Posted July 17, 2009 Report Posted July 17, 2009 ENGINE TIGHTENING SPECIFICATIONS (FT. LBS.) Spark Plugs: 30 Cylinder Head Bolts: 60-70 Intake Manifold: 15-20 Exhaust Manifold: 15-20 Rocker Arm Shaft Bracket: N/A Rocker Arm Cover: N/A Connecting Rod Cap Bolts: 40-50 Main Bearing Cap Bolts: 80-85 Flywheel to Crankshaft: 55-60 Vibration Damper or Pulley: 108 Quote
randroid Posted July 17, 2009 Report Posted July 17, 2009 aero3113, The proper tightening sequence will describe a spiral outward from the center. Keep this in mind and you don't need to find a diagram whenever you want to torque a series of bolts. -Randy Quote
radioguy7 Posted July 17, 2009 Report Posted July 17, 2009 I remember when I worked for GE Aircraft engines and we would use a hydraulic fixture that looked like an octopus to stretch the tie rods on a front fan section or turbine section. It was a series of stretching and releasing pressure and then a final torque while watching dial indicators. The final torque was VERY important. We also used an alternating pattern as you do when torquing heads or manifolds. Quote
randroid Posted July 17, 2009 Report Posted July 17, 2009 Gents, Just a little aside, the torque applied equals 70% of the shear strength. -Randy Quote
aero3113 Posted July 17, 2009 Author Report Posted July 17, 2009 Should I check them cold and hot or just hot? Quote
Plymouthy Adams Posted July 17, 2009 Report Posted July 17, 2009 tighten to 35 ft. lb. in sequence...retighten to 65-70 ft. lb in sequence...run engine to normal operating temperature..re-torque to 65-70 ft. lb in sequence.. Quote
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