Why are holes drilled in the crankshaft?

Oil holes deliver vital lubrication to contact points between piston connecting rods and crankshafts in truck and car engines. Because oil holes are interconnected, they must enter and exit crankshafts at precise positions for efficient lubrication, or the engines will fail.

Why do crankshafts have drilled oil passages?

Some connecting rods have an oilway drilled through them to to allow oil to be sprayed onto the cylinder wall. When this is the case, the connecting rod journal bearings will have a groove to allow a feed of oil into the connecting rod.

What causes crankshaft failure?

Crankshaft failures may be resulted from by several causes which are oil absence, defective lubrication on journals, high operating oil temperature, misalignments, improper journal bearings or improper clearance between journals and bearings, vibration, high stress concentrations, improper grinding, high surface …

How do you cross drill a crankshaft?

In a cross-drilled crankshaft, oil feed holes are drilled completely through the main journals so the passages are open on both ends. Holes from the rod journals are then drilled at an angle to intersect the holes in the main jouranls at the centerline of the crank.

How does oil get into a crankshaft?

The pump sends the oil up to the main bearings of the crankshaft (in the lower middle), which converts linear energy into rotational energy. From there, the oil moves through oil holes drilled in the crankshaft, to the rod bearings, and then through an oil line to the cylinder head (in the upper middle).

What is a splayed crankshaft?

A splayed crankshaft is a crankshaft in which the connecting rod journals of two adjacent cylinders are off set on the same throw. Torque converter. The torque converter mounts to the crankshaft through a flexplate.

What can damage crankshaft?

Far more frequently, broken crankshafts can be attributed to:

  • Mechanical overload of the crankshaft through abnormal combustion, water hammers, etc.
  • Sudden jamming of the engine due to a faulty gearbox, loose counterweights, etc.
  • Excessive rotary oscillation, e.g. faulty vibration dampers, faulty flywheels or couplings.

What is cross drilling?

Cross drilling is where a round hole is drilled through the middle of a round bar. Drilling on a round surface with a drill bit is asking for trouble. In general always use a center drill first unless the drill is guided.

How does oil get into the crankshaft?