First thing to do is check fluid level then check for leaks inside and outside you have to know if fluid can leak out then air will get in air is no good in a hydraulic system air compresses fluid dose not .Try bleeding the system if that dose not fix it the most likely problem would be the master cylinder the one inside on the clutch pedal look for fluid there or on the floor if you see it it needs to be replaced. The only other thing would be the slave cylinder witch is inside the bell housing witch the transmission would need to be removed to get at it in witch case you might as well replace the whole clutch its not worth the time then to have it fail a couple month down the road.
SOURCE: nissan clutch problem
If your not able to shift into any gear that means your clutch is not engage/disengaging. Check for fluid leaks, you said topped off and fluid levels were low? It sounds like you have a Slave cylinder or master cylinder leak, if its leaking its bet to replace both.
SOURCE: 1998/99 Dodge Dakota clutch and manual transmission problems
clutch needing replaced, very common on all manuals
pedal travel adjustment,yes
gear shift adjustment,no
SOURCE: Loss of acceleration. Transmission? Clutch? Cable?
Try replacing the clutch cable first, these cars came with a simple clutch cable that is cheap & easy to replace. the end that hooks to the clutch pedal is plastic & can wear out. the later VW golfs came with an expensive automatically adjusting clutch cable. these can be installed in older VW's.
the old cables had to be manually adjusted like a motorcycle clutch cable. check a vw service manual. there needs to be a bit of slack on the lever that pushes the clutch disk.
if it is too tight the clutch may not engage fully & you will cook the clutch & flyweel.
Also check the shift linkages, there are many plastic bushings in the system that wear out
and can make the shifting sloppy. these are cheap and easy to replace.
Personally I have not had any real problems with the 5 speed transmissions in VW's.
although I have hear of a variety of problems with latter VW's trashing the transmissions. The automatics are another story.
The 020 transmissions were built to handle the 75hp/ 1800lb Schricco. putting them in a
Golf GTI with 150hp, or a 3000lb jetta 3 caused lots of problems.
ps: I would pick up a cheap used 5 speed from a junkyard, preferably out of a Rabbit, not
a golf or Jetta. take it to a machine shop to check for the usuall problems to see if it ok
before installing it. If that fixes the problem get your money back from the people that sold you the rebuilt transmission.
SOURCE: have to change clutch plate on suzuki grand vitara
If it's hard to get into gear you should check the clutch is disengaging properly.
Before changing the clutch plate, check that the clutch throw-out is adjusted correctly and the actuating hydraulics/levers have the correct amount of travel.
SOURCE: 2003 Nissan Sentra SE-R Spec-V clutch sticking and hard shifting
I am dealing with a very similar issue on my 03 Spec V , So far i noticed the clevis pin was loose and the locking hitch pin that slips thru it had fallen out . this caused the gears to not wanna engage due to the bolt behind the clevis which runs to the master cylinder was not getting pressed in when i pushed the clutch pedal in because the clevis pin was slippin on n off giving me no pressure up top .. I had to remove my lower dash panel in order to get visual n hand access to this pin , it is a tight spot to work in as well . May be easist to remove the 4 14mm bolts that hold yur driver seat in to give ya more room to work n stretch out ur arms
Clutch
ADJUSTMENTS
1997-98 Models
CLUTCH PEDAL HEIGHT
The clutch pedal height should not be a periodic adjustment but may be checked after components of the mechanical clutch system have been replaced.
The proper clutch pedal height should be 0.2 in. (5mm) above the brake pedal height
If adjustment is necessary, loosen the locknut and turn the adjusting bolt until the appropriate height is reached. Once set, keep the bolt from turning and tighten the locknut to secure the adjustment.
CLUTCH PEDAL FREE-PLAY
The clutch pedal free-play should be checked from time-to-time in order to assure proper clutch operation.
The proper clutch free-play should be 0.6-1.1 in. (15-25mm).
Fig. 1: Pedal free-play is adjusted at the joint nut (2), while keeping the outer cable nuts (3) tightened around the center cable thread portion
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