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Clutch actuation - The Differences

19.04.2024

Some Volvo models were produced with both hydraulic and cable-operated clutches, and the M46 and M47 transmissions were also installed in several model series. This makes it possible for different types of actuation to be found in the same clutch bell housing. For example, an early Volvo 740 can usually be converted to a hydraulic clutch without any problems. Here we show the differences in an early M46 clutch bell housing.


With hydraulic clutch actuation, the slave cylinder presses on the release lever. To ensure that the release bearing is pressed forwards, the release lever is mounted on the pivot pin to the left of the release bearing. The pivot pin is screwed onto a stud bolt, which is screwed into a nut inserted between the bell housing and the gearbox housing. The height of the pivot pin can be varied using two different lengths and washers. On the pivot pin there is either a plastic ball socket to reduce friction or a locking spring engaged in the release lever. The hydraulic clutch adjusts itself via the initial position of the piston in the slave cylinder; manual adjustment is not possible.


With cable clutch actuation, the clutch cable pulls on the release lever. To push the release bearing forwards, the release lever is mounted on the pivot pin to the right of the release bearing. The pivot pin is firmly riveted to the release lever. It is held by a screw on the right-hand side of the clutch bell housing. Here too, the bearing height can be varied by using washers and a longer bolt. This may be necessary, for example, after the flywheel has been turned. The standard Volvo clutch cables have a manual adjustment with thread. When changing the clutch or the clutch cable, a basic adjustment must be made on the cable.

  • All notes serve only as an example and do not replace the workshop instructions of the automobile manufacturers! All information is supplied without guarantee!

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