Non-Operable Clutch Diagnosis
by Mike Morelli, firstname.lastname@example.org ,
from the collective wisdom of the “triumphs” mailing list
It is a quite common problem for Triumphs to develop a non-operable clutch. Basically, when one pushes on the pedal, the gears grind when shifting into first or reverse (from a stop, with the engine running), rather than going into gear. Here are some possibilities you may want to consider:
- Ensure that the clutch hydraulics fluid level is correct, the system is properly bled, and there are no leaks.
- Measure the lateral movement of the slave cylinder push rod as a function of full pedal movement. This should be about 5/8 of an inch. Note that the slave cylinder push rod should be in the center hole of the clutch shaft.If the travel is not at least 5/8″ then:
- Inspect the hole in the pedal into which the master cylinder push rode connects. If this is ovalled out then it is likely that you are not developing enough travel at the input to the hydraulic system. For this case you have two options: 1) remove the pedal, brazen over the hole, and redrill a new hole; or 2) fashion an adjustable master cylinder push rod. I have implemented the latter with much success.
- Check the condition of the plastic hose segment (between master and slave cylinders). I have heard of this expanding under certain conditions (namely a cheap replacement part which has weakened with age and heat). This can be measured