Are Harley head bolts torque to yield?
The studs are torque to yield. They are reusable. They are not damaged by the torque process. Torquing a fastener to a preliminary torque and then turning a certain amount of degrees is simply a more accurate way to torque a fastener.
Are Harley head bolts reusable?
Can I reuse head bolts? A head bolt should not be reused if the threads are galled or badly damaged. Chasing damaged head bolt threads with a die will clean up the threads but also remove material (metal) and undermine the head bolt’s ability to torque down and hold to specs.
How much torque does a Harley Davidson cylinder head have?
Technical information on the installation of cylinder heads for Harley-Davidson motorcycles. For each cylinder head, start with head bolt numbered one. In increasing number sequence (1-2-3-4), tighten the head bolt in three stages. 1. Tighten each bolt to 7-9 foot pounds of torque. 2, Tighten each bolt to 12-14 foot pounds of torque. 3.
How much torque does a torquing cylinder head have?
Torquing the bolts produces 1700 pounds x 4 (studs) = 6800 pounds force on the gasket COLD. Stretching the 4 (studs) at 700 pounds force each equals 2800 pounds force.
What’s the torque increase stage on a Harley?
Stage 3 is where a bit more work starts, cam lift and duration increase pushing the effective power range from 2500-5000rpm, the increase in lift means that high lift valve springs are required and compression is increased to improve low/mid torque.
What are the forces on a Harley Davidson engine?
To give you an idea of what kind of forces without getting into all the formulas: We will assume the engine starts at 68 degrees COLD… and when HOT it reaches near 400 degrees. This temperature is around the rods or studs. The fins are cooler. This is a “rise” in temperature of 332 degrees.
Technical information on the installation of cylinder heads for Harley-Davidson motorcycles. For each cylinder head, start with head bolt numbered one. In increasing number sequence (1-2-3-4), tighten the head bolt in three stages. 1. Tighten each bolt to 7-9 foot pounds of torque. 2, Tighten each bolt to 12-14 foot pounds of torque. 3.
How much torque does a road King head have?
The Road King ‘s head bolts 1st step is 11.67 foot lbs of torque and the second step is 17 foot lbs of torque. The 3rd step is 90 degrees or a ¼ inch. The rocker housing bolts have 14 foot pounds of torque and the rocker cover bolts have 18 foot pounds of torque. The rocker arm support plate bolts have 22 foot pounds of torque.
Torquing the bolts produces 1700 pounds x 4 (studs) = 6800 pounds force on the gasket COLD. Stretching the 4 (studs) at 700 pounds force each equals 2800 pounds force.
To give you an idea of what kind of forces without getting into all the formulas: We will assume the engine starts at 68 degrees COLD… and when HOT it reaches near 400 degrees. This temperature is around the rods or studs. The fins are cooler. This is a “rise” in temperature of 332 degrees.