# How do you calculate bearing life?

## How do you calculate bearing life?

Bearing Rating Life Calculation

1. C = Dynamic Capacity (dN or Lbs)
2. P = Equivalent Bearing Load (N or Lbs)
3. N = Rotating speed in RPM.
4. e = 3.0 for ball bearings, 10/3 for roller bearings.

Ball bearings

## Which tool is used to check the internal clearance of the bearing?

The dial bore gauge measures the inside of round holes, such as the bearing journals. This one tool can measure 2″ up to 6″ diameter holes. Both tools are needed in order to check the interior and exterior dimensions of the crankshaft, rods and engine block journals, as well as the thickness of the bearings themselves.

## What is main bearing clearance?

The clearance measurement of the main bearing determines the amount of wear down the bearing has been subjected to. The clearance of the bearings will depend on the size of the engine but for a 900mm bore engine the clearance is between 0.40 and 0.70 mm with a maximum allowable of 0.9mm.

## What is bearing radial internal clearance?

Internal clearance is the play within a ball bearing. It is the geometrical clearance between the inner ring, outer ring and ball. It is a critical factor in bearing selection that will directly impact bearing life.

## How do you measure big end bearing clearance?

For these reasons, bearing clearances are specified as “vertical clearance” and must be measured at 90 degrees to the split line. The best method of measurement is with a dial bore gage that measures the bearing inside iameter when the bearings are installed at the specified torque without the shaft in place.

## Where can you use feeler gauges to measure on an engine?

Uses and Applications of Feeler Gauges In automotive applications, feeler gauges can be used to set the valve clearance between the rocker arms and the valve stem and to adjust the spark plug gap. In oil refinery applications, wall slot size in reactor vessels can be checked with a feeler gauge.

## How do you check the axial clearance of a bearing?

The axial clearance is the measured value in which one bearing ring can move axially in relation to the other. In bearings of the same type, axial clearance depends on the radial clearance. The contact angle is formed between the connecting line of the contact points ball/raceways and a plane perpendicular to the axis.

## What is axial clearance?

The axial clearance is the difference between the possible axial displacement in positive and negative direction for-four point bearings and cylindrical roller bearings. For cylindrical roller bearings, a value larger than zero should be entered for the axial clearance, since the bearing usually has axial clearance.

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