Engine Speed Measurement
| Required Tools | ||
| Part Number | Part Name | Quantity |
| 6V-3121 6V-4950 |
Multitach or Speed Pickup |
1 |
 | |
| Illustration 1 | g00320509 |
6V-3121 Multitach (1) Carrying case. (2) Power cable. (3) Tachometer generator. (4) Tachometer drive group. (5) Multitach. | |
The 6V-3121 Multitach Group can measure engine speed from a tachometer drive on the engine. This multitach can also measure engine speed from the tracking of tape on a rotating engine part.
Note: See Special Instruction, SEHS7807. This information is provided with the 6V-3121 Multitach. This information also provides instructions for the test procedure.
The 6V-4950 Speed Pickup can be used as a diagnostic tool accessory with a 6V-2100 Multitach.
 | |
| Illustration 2 | g00320510 |
6V-4950 Speed Pickup | |
The 6V-4950 Speed Pickup can be used on all Caterpillar Diesel Engines that are equipped with 6 mm (0.25 inch) single wall fuel injection lines. This speed pickup can measure engine rpm automatically. This speed pickup can also measure engine rpm with an accuracy of ±1 rpm.
Note: See Special Instruction, SEHS8029 that is with this tooling. This publication provides instructions for using the 6V-4950 Speed Pickup .