QuestionHoward - Hello, once again! Questions below are regarding my 1968 MGB. Thanks for you answer on how to get my stuck metal cup out of the clutch slave cylinder a few weeks ago, worked like a charm!
I have 2 questions: First, got the clutch master and slave cylinders rebuilt, all hooked back up and bled. The slave cylinder piston only moves about 1/2 inch or less when clutch pedal is pressed. I'm not sure how much it should move or if this is even enough to disengage clutch? Should it move more than that?
Part 2: Starting issues - battery is good, getting a buzzing or clicking noise when trying to start, starter is not engaging. Removed starter, had it tested at Auto Zone, worked like a champ. Fuel pump kicks in like it should, builds pressure, shuts off, etc. Just getting that "solenoid" type of buzzing and/or clicking when trying to start her. I know you've probably answered this question 200 times, but I searched thru the past questions and answers and can't find a good answer to this issue. Even though the starter tested "good" at Auto Zone, could the starter solenoid attached to the starter still be the culprit? Not sure where to look for the problem. Thanks!
AnswerHi Ben,
I don't remember ever measuring the distance traveled by slave cylinder piston but I do believe it was more than 1/2 in. I guess someone who is good at math could figure out how far it should travel by the measurement of the bore of each and the travel of the master cylinder piston.
However all you need to do is to confirm that the master cylinder piston is out all the way when it starts and there is no air in the system and the slave will have to move the correct distance as fluid does not compress.
When assembled, the clutch pedal should not have any more than an inch free play and feel firm as soon as the free play is taken up and feel firm all the way to the floor.
The buzzing noise is an indication of low voltage to the solenoid. This can be caused by either a low battery or bad connections anywhere in the circle. (battery post to cable, cable, cable to solenoid, solenoid to starter, engine to ground strap, ground strap to frame, frame to battery ground cable, cable or ground cable to battery post.)It can even be caused by low voltage from the trigger wire from the relay to the solenoid.
This is easy to locate by use of a volt meter doing a voltage drop test at each point. If you are not familiar with the process, let me know and I will detail it.
Howard
