TAPE-IDENTIFICATION 7X7930 - Caterpillar

Illustration 9 g00294392
Checking Bore Runout Of The Flywheel Housing
Turn the flywheel counterclockwise in order to put the dial indicator at position (B). Write the measurements in the chart.
Turn the flywheel counterclockwise in order to put the dial indicator at position (C). Write the measurement in the chart.
Turn the flywheel counterclockwise in order to put the dial indicator at position (D). Write the measurement in the chart.
Add the lines together in each column.
Subtract the smaller number from the larger number in column B and column D. Place this number on line III. The result is the horizontal eccentricity (out of round). Line III in column C is the vertical eccentricity.
Illustration 10 g00294396
Graph For Total Eccentricity (1) Total vertical eccentricity. (2) Total horizontal eccentricity. (3) Acceptable value. (4) Unacceptable value.
On the graph for total eccentricity, find the point of intersection of the lines for vertical eccentricity and horizontal eccentricity.
If the point of intersection is in the "Acceptable" range, the bore is in alignment. If the point of intersection is in the "Unacceptable"range, the flywheel housing must be changed.Face Runout (Axial Eccentricity) Of The Flywheel
Illustration 11 g00294398
Checking Face Runout Of The Flywheel
Refer to illustration 11 and install the dial indicator. Always put a force on the crankshaft in the same direction before the dial indicator is read. This will remove any crankshaft end clearance.
Set the dial indicator to read 0.0 mm (0.00 inch).
Turn the flywheel at intervals of 90 degrees and read the dial indicator.
Take the measurements at all four points. Find the difference between the lower measurements and the higher measurements. This value must not exceed the maximum permissible face runout (axial eccentricity) of the flywheel.Bore Runout (Radial Eccentricity) Of The Flywheel
Illustration 12 g00294400
Checking Bore Runout Of The Flywheel (1) 7H-1945 Holding Rod. (2) 7H-1645 Holding Rod. (3) 7H-1942 Indicator. (4) 7H-1940 Universal Attachment .
Install the 7H-1942 Dial Indicator (3). Make an adjustment of the 7H-1940 Universal Attachment (4) so that the dial indicator makes contact on the flywheel.
Set the dial indicator to read 0.0 mm (0.00 inch).
Turn the flywheel at intervals of 90 degrees and read the dial indicator.
Take the measurements at all four points. Find the difference between the lower measurements and the higher measurements. This value must not exceed the maximum permissible bore runout (radial eccentricity) of the flywheel.Flywheel without BrakeSaver ... 0.15 mm (0.006 inch)Flywheel with BrakeSaver ... 0.25 mm (0.010 inch)
Illustration 13 g00294401
Flywheel Clutch Pilot Bearing Bore
Take the measurements at all four points. Find the difference between the lower measurements and the higher measurements. This value must not exceed the maximum permissible pilot bore runout of the flywheel.Flywheel without BrakeSaver ... 0.13 mm (0.005 inch)Flywheel with BrakeSaver ... 0.25 mm (0.010 inch)Vibration Damper
Damage to the damper or failure of the damper will increase vibrations. This will result in damage to the crankshaft.The force from combustion in the cylinders will cause the crankshaft to twist. This is called torsional vibration. If the vibration is too great, the crankshaft will be damaged. The vibration damper limits