Nov 21, 2016 · Most modern vehicles have gone to the fully-integrated hydraulic system, which eliminates the mechanical fork and bearing and replaces it with a hydraulic throwout bearing. When the clutch master cylinder pressurizes the fluid in the lines, the bearing ram expands, pushing on the clutch diaphragm, disengaging the clutch.
A throw-out bearing happens to be an integral part of clutch operation. Whenever you press down on the clutch pedal, the throw-out bearing applies lot of pressure to the flywheel pressure plate, pulling it away from the clutch disc in order to disrupt power flow and then disengage the clutch.
If the diaphragm is not completely flat, some of that spring's energy is still stored within the spring. Figure 8 shows this difference as nearly 10 ft-lb of lost clamping force. To disengage the clutch, this pent-up energy must be overcome by the thrust bearing, as shown in Figure 9, as an additional 130 lb (35%) of thrust. This is because the ...
This indicates that the clutch cable is actuating the lever, yet the clutch is still not disengaging. Meaning, its probably not a problem with the cable, but rather inside the clutch. (Although the cable may still need to be looked at later.)
My buddy's '98 Frontier (4-banger, 5-speed) is getting hard to shift and clutch pedal free play is large -- pedal seems to travel almost halfway before hitting resistance and starting to act on the clutch mechanism. I guess it must not be fully disengaging, causing the hard shifting/grinding. How is free play adjust on a Frontier?
Sometimes this issue of the clutch not fully engaging but slipping could be caused due to the dirt build-up inside. Cleaning the clutch thoroughly might be the simplest solution to this problem. You could also try lubricating the system with a good quality lubricant. This might free up the clutch and thus prevent the squeaking noise.
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