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Slipping can be caused by a few different problems. You need to determine the
following
Clutch worn out:
 | Chances are if you have many miles on your vehicle and you
begin to notice slipping of the clutch the clutch is just plain worn out.
We've been asked many times how long will a clutch last. The answer varies with
the driver, vehicle and usage. A rule of thumb is that a properly adjusted and
used clutch will last 1,000 miles for every thousandths of a inch of facing
material. Of course this is just a rule of thumb we've seen clutches that last
250,000 (our own delivery vehicle) and some that last 32 miles (parking
brake on) |
Contamination:
| Does the clutch have oil or grease on it? Is the rear main seal or
transmission input shaft seal leaking? |
Cable system:
| Slipping can be caused by the cable binding in the casing. The cable
binding doesn't allow the clutch to fully engage. This is easy to identify,
the free play at the pedal will have increased and decreased at the clutch
release bearing. To fix this try to adjust the free play at the clutch.
Replace the cable if necessary. The cable may seem free moving if there is
no load on the cable. |
| If there is a self adjuster, is it working properly? A non working self
adjuster can put too much pressure on the clutch causing it to partially
release and slip. |
| Check to see if the clutch release bearing is binding on the quill. This
can cause slipping if the bearing does not return fully. |
Hydraulic system:
| The hydraulic system should apply a very light preload to the clutch
bearing (and clutch). If the hydraulic system doesn't allow the bearing to
come back fully the clutch could still be partially released. |
| Check to see if the clutch release bearing is binding on the quill. This
can cause slipping if the bearing does not return fully. |
Mechanical system:
| Too little pedal free travel. Adjust as necessary. |
| Bent clutch linkage. Replace. |
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