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It sounds as though the clutch pressure plate has become weak.
When you press the clutch pedal the release/throwout bearing presses against the centre of the clutch pressure plate. This causes the metal 'fingers' -the springs- on the pressure plate to flex and release pressure on the driven plate - momentarily disconnecting the drive from engine to gearbox.
A weak pressure plate isn't fully releasing the driven plate. If you're going to do any replacing of parts - a clutch should be replaced in 3 units: Pressure plate, driven plate and release/throwout bearing.
There are 3 progressively difficult and expensive steps you can take. I have to assume that the Mentor is the same as a Sephia.
First: Check the level of fluid in your brake/clutch canister. It MIGHT have 2 separate canisters (like the 1995 Sephia.) But I doubt it.
Second: Check your hydraulic clutch cable and the unit at the transaxle. It may need to be bled.
Third (and most expensive): Replace your clutch and pressure plate. This is the most expensive as it requires removal of the engine.
I hope this helps you find the source of your difficulties.
Most likely your hydraulic hose has sprung a leak. Otherwise your problem would be with the clutch master cylinder cup or the clutch release cylinder cup. Check your clutch fluid level, if it is low there may be air in the system and it will need to be bleeded.
Insert a pilot shaft or an old input shaft into the center of the clutch disc, pressure plate, and the pilot bearing in the crankshaft.
With the pilot tool supporting the clutch disc, loosen the pressure plate bolts gradually and in a crisscross pattern.
Remove the pressure plate and clutch disc.
Clean the transmission and clutch housing. Clean the flywheel surface with a non-oil based solvent. Wash your hands before installing or handling the clutch assembly parts. Hold the clutch disc by the center hub only.
Before assembly, slide the clutch disc up and down on the transmission input shaft to check for any binding. Remove any rough spots with crocus cloth and then lightly coat the shaft with Lubriplate.
To remove the throwout bearing assembly: Remove the return clip and take out the throwout bearing carrier and the bearing.
To replace the throwout arm use a / 16 in. punch, knock out the throwout shaft spring pin and remove the shaft, springs, and the center lever.
Do not immerse the throwout bearing in solvent; it is permanently lubricated. Blow and wipe it clean. Check the bearing for wear, deterioration, or burning. Replace the bearing if there is any question about its condition.
Check the shafts, lever, and springs for wear and defects. Replace them if necessary.
If you hadn't planned on replacing the clutch disc, examine it for the following before reusing it. Loose rivets. Burned facing. Oil or grease on the facing. Less than 0.3mm left between the rivet head and the top of the facing.
Check the pressure plate and replace it if any of the following conditions exist: Scored or excessively worn. Bent or distorted diaphragm spring. Loose rivets.
Insert the control lever into the clutch housing. Install the two return springs and the throwout shaft.
Lock the shift lever to the shaft with the spring pin.
Remove transaxle. Remove clutch pressure plate. Remove clutch plate. Inspect the flywheel for damage and resurface or replace as necessary. Replace pilot and throwout bearings. Install new clutch plate. Install new pressure plate. Re-install transaxle.
get a service manual on CD over on ebay for about 5 bucks. jack car way up, drop the drive shaft, disconnect shifter and clutch linkage, unbolt the bell housing from the transmission and remove, unbolt pressure plate and take off flywheel, have flywheel resurfaced and reinstall, install new clutch and pressure plate, replace throwout bearing, put transmission and bell housing back in, connect shifter linkage and clutch cable or hydraulic, put drive shaft back in and you are done.
no they auto ajust as they were if your clutch is slipping you going to need to replace it i would also recommend replacing the pilot bearing throwout bearing and pressure plate while your in there not to hard to do
if i have help would you mind leaving positive feedback thanks
Changing the clutch or throwout bearing in a rear wheel drive is one of the easier things to do. Having it on a lift is nice but it doesn't have to be. The truck needs to be high enough to get under and work. Needs to be on jack stands or blocking sturdy enough to hold the truck steady. Do not use ramps. Remove the drive shaft, making sure the caps stay on the U joints. remove the shifter from the transmission. Take the slave cylinder off the trans., the stater, and then the transmission from the engine. You will need to support the motor in place so that it doesn't tear up the radiator or the firewall depending on the balance point. Take the trans down by pulling it back about 3 inches. Use a jack or 2 people to do this. Transmission is somewhere around 100 lbs. On the back of the motor you will see the pressure plate held on to the flywheel with 6 bolts. Take the pressure plate off and the clutch is between the pressure plate and the flywheel. The flywheel may need to be resurfaced or you may just clean it up with coarse sandpaper. The clutch disc goes in one way with the spring assembly facing the rear of the truck. There should be an alignment tool with the clutch kit. The clutch has to be centered on the flywheel. If there is no alignment tool provided, you can center it by making sure the clutch disc is even with the edge of the pressure plate all the way around. Usually, the clutch is just a little bit smaller diameter than the pressure plate.
The throwout bearing is on the shaft coming out of the transmission. Should be held on by a fork that sticks out through the bell housing. After the throwout is replaced and you make sure it has free travel on the shaft reinstall the transmission. You may need to wiggle it a bit to get the splines on the shaft and the ones in the clutch to line up. Make sure the transmission is held straight so that the shaft in the transmission doesn't get bent. Slide the trans. to the motor and onto the alignment pins and bolt in place. Reinstall everything and you are done. Thank you for using Fixya and since your going to replace the throwout bearing, you might as well replace the clutch since you have the transmission away from the engine to replace the bearing. Good luck and be safe.
two things to mind, sometimes when you get a new clutch it comes with blocks in pressure plate there put in there from the factory for shipping purposes, they have to be removed otherwise it will do what you discribe. secound if you got the wrong length throwout bearing will do it to. most likely its one or the other. if you sure everything is right as far as clutch, pressure plate, and throwout bearing, than the only other thing i can say it could be is slave cyl. bad. hope this helps. OLD SCHOOL.
this is a big job for someone who is not mechanically inclined but....here it goes go buy a new clutch new tranny fluid and a haynes manual at the auto parts store your going to have to drain and drop your tranny ... BUY THE CLUTCH WITH THE TOOL theres an alignment tool needed to align the plates n bearings start by pulling off both tires, brakes and both cv axels be sure to remove the intermediate shaft from the tranny on the passenger side (should come out with the axel passenger side only) so do yourself a favor and buy an impact gun with at least 500 ft lbs torque youll need it also have handy your 14mm 17mm and 19mm impact sockets and remember this job usually runs around 1,200 bucks at firestone also DO NOT remove the bolt in the middle of the front springs under the hood just the four around it and the will pop out no prob and wont need to be clamped remove the starter behind your engine its under the oil filter also if your new to this sorta thing its gonna take you about 3 days to do it buy the impact gun if ur in a hurry look at a pawn shop have your flywheel machined its going to be accessible and it needs it hope this helps dont forget the book which you should already have bought anyway its good for your torque specs which you will also need a torque wrench for the clutch also dont crack open ur tranny this isnt a honda