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That cylinder is known as the clutch slave cylinder. It should push against the clutch fork every time the clutch pedal is depressed to allow gear changes. If it doesn't, suspect a faulty slave cylinder, or clutch master cylinder.
In the first place its called a slave cylinder. usually by means of bracket or bolted directly to fire wall diconnect fluid lines,unbolt & removemake sure you bleed the new one
First check to see if the master cylinder is full of fluid, if it is then you may have a bad master cylinder or slave cylinder out. If you find a leak then you have found your problem if it's low n fluid you will have to bleed the system, if you need instructions on doing this just post a answer t o this question and I will tell you how to do it. It will require one wrench and brake fluid to bleed the system, if you need to replace the slave or the master cylinder you will need tools to replace these items and I don't have any ideal if you want to repair this yourself or not or what it will cost to fix. Normally the clutch pedal will feel mushy or soft if the slave or master is out and this would cause it hard to get into gear. Let me know so I can help.
Replace it. Not a difficult job. Be careful the bracket on the V6 4spd. isn't strong so don't break it while loosening the slave cylinder retaining nuts.
the master cylinder is leaking/by-passing hydraulic fluid
the slave cylinder is leaking/by-passing fluid
You didn't mention a fluid leak, so that would eliminate the obvious cause of a leaking pipe. However, check for leaks around the master cylinder (on the firewall) and at the front of the engine by the clutch itself. This would indicate which of the two might be the problem, If they haven't been replaced in many years, it's probably sensible to replace both at once. The slave cylinder can be replaced without removing the engine. If you have ABS, you'll likely need to loosen/remove the alternator.
To determine which type of clutch you have, servo hydraulic or cable.
Look down past the engine bell housing and determine the existance of a hydraulic clutch slave cylinder.(a piece of casting with a rod facing towards the rear of the vehicle pocket into a bracket protruding out of the gearbox bell housing. As well as a pipe and bleed nipple to be crude)
(which I believe you have).The hydraulic fluid for this unit is sourced from the brake master cylinder reservoir via a sneaky pipe partially obscured to the clutch master cylinder on the internal firewall.If you have no clutch slave cylinder near the bell housing there would be an obvious bounden cable running from the firewall down to the outer of which will be stopped at a bracket hanging off the engine.The inner will continue to a bracket protruding from the gearbox bell housing.
Remove the three 13mm nuts holding the pedal bracket to the bulkhead, this will give you more room to work but just as it's free to move about a bit. Undo the two 10mm nuts holding the cylinder to the pedal assy and the pipe union at the bottom of the cylinder. Pry off the clutch hose at the fluid reservoir. Release the circlip on the end of the cylinder rod on the pedal.
When you put the new one in feed the hose through first with a piece of wire so you can locate it at the fluid reservoir, loosley connect the union at the bottom of the cly, and pop the end of the cyl rod into place and replace the circlip. now try to relocate the long bolts into the cylinder body, it's a fiddle but can be done. Use a 3/8 drive to undo and re-do the 10 mm nuts as a smaller one seems better but doesn't have the reach. The rest is just common sense.
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