chebetio510 Posted April 27, 2012 Report Share Posted April 27, 2012 So within the last 2 weeks my truck is having issues getting into 1st, 2nd, and reverse... Today i replaced clutch slave cylinder. i have presure. but notice that when in gear and pedal fully pushed in the truck moves forward a bit or reverse if it was in reverse. as if i was releasing teh pedal.. i know there is no adjustment for the pedal clearnece like on my 510. help with this? Clutch doesnt slip or anything.. Quote Link to comment
datzenmike Posted April 27, 2012 Report Share Posted April 27, 2012 Have you replaced the release bearing and maybe changed the housing that holds it at the same time??? If you did you need to put the old one back in. Check the peddle free play. Push down lightly on the clutch peddle with your thumb. There should be a couple of mm or 1/16" of free play.. Too much play will reduce the slave travel and the clutch may not release fully and drag. Quote Link to comment
chebetio510 Posted April 27, 2012 Author Report Share Posted April 27, 2012 i put in a new clutch in october 2011... and put in a 5 speed from a 78 l20 620 with the original 5 speed.. havent had issues until now? the bearing housing is the original that i got the truck with Quote Link to comment
datzenmike Posted April 27, 2012 Report Share Posted April 27, 2012 Good, that should work. Was the release bearing the type that is greased and permanently sealed, or did you have to grease it yourself before installing? Is there any sounds that come and go when using the clutch? Quote Link to comment
datsunaholic Posted April 27, 2012 Report Share Posted April 27, 2012 I can only think of a few reasons for this to happen: 1) Hydraulic issue. Most common. You replaced the slave, but the master can cause the same problem if it'd bypassing internally or letting air in. I had one that would work until the engine got hot, then the master stopped working or lost effectiveness. 2) Mechanical problems a) you didn't get the throwout bearing pressed all the way on, and over time it has finally gotten all the way onto the collar. B) the "new" clutch was faulty and is delaminating. I had that happen once. It happened fairly slowly, but eventually the clutch wouldn't release at all. Naturally it happened 50 miles from home. Or, it could simply be misadjusted. The adjuster is at the pedal end, and if the lock nut wasn't tightened all the way down the rod freely rotates and can change the adjustment. Quote Link to comment
Figbuck Posted April 28, 2012 Report Share Posted April 28, 2012 My first thought is hydraulic too. I have bought new remanufactured clutch master and slave and they were toast out of the box. It probably need to be bled again. I noticed that it seemed like pedal all the way in, couldn't get into a gear, then chunk after a few pumps. I re-bled it with and it worked until air some how got back into the system in a day or so. I was on a job site way out in the sticks. Couldn't get it into gear. Engine off, put it in gear, then start. Couldn't shift into higher gears. I had six ounces of brake fluid left in a container. I got under the truck and opened the bleeder on the slave and just let fluid run out, then tightened. Filled with fluid, opened the bleeder another time and got it to work for another week. Another truck, I had a little crack in the rubber hose to the slave, it was letting in air the system just enough to let it go into gear if it had been pumped, but not all the time. Quote Link to comment
moparvwfreak Posted April 28, 2012 Report Share Posted April 28, 2012 my new 73 does the same thing. i think when they did the 5spd swap they used the 4spd throw out collar. i just dont put the clutch down fully. it'll work for now till i can find the proper sleeve. Quote Link to comment
datzenmike Posted April 28, 2012 Report Share Posted April 28, 2012 Stock '73? The throw out collar is matched to the pressure plate on the L16 so it does not matter what transmission you put behind it. Short 200sx dogleg or long 71B four or five speed. Quote Link to comment
moparvwfreak Posted April 28, 2012 Report Share Posted April 28, 2012 nope, L20b, centerforce clutch (so i have been told), and a later truck 5spd. Quote Link to comment
metalmonkey47 Posted April 28, 2012 Report Share Posted April 28, 2012 My $0.02 New hydraulic parts aren't hardly worth the bags/boxes they're in these days. I bought a new slave a few months back and actually had to re-use the old seal/piston in the new housing. The new seal was much too small and the fluid was blowing right by it. Quote Link to comment
chebetio510 Posted April 28, 2012 Author Report Share Posted April 28, 2012 Good, that should work. Was the release bearing the type that is greased and permanently sealed, or did you have to grease it yourself before installing? Is there any sounds that come and go when using the clutch? I am getting what i think is throw out bearing noise. squeal but only when i have clutch pedal all the way in or while releasing... when pedal is out no noise Quote Link to comment
chebetio510 Posted April 28, 2012 Author Report Share Posted April 28, 2012 My first thought is hydraulic too. I have bought new remanufactured clutch master and slave and they were toast out of the box. It probably need to be bled again. I noticed that it seemed like pedal all the way in, couldn't get into a gear, then chunk after a few pumps. I re-bled it with and it worked until air some how got back into the system in a day or so. I was on a job site way out in the sticks. Couldn't get it into gear. Engine off, put it in gear, then start. Couldn't shift into higher gears. I had six ounces of brake fluid left in a container. I got under the truck and opened the bleeder on the slave and just let fluid run out, then tightened. Filled with fluid, opened the bleeder another time and got it to work for another week. Another truck, I had a little crack in the rubber hose to the slave, it was letting in air the system just enough to let it go into gear if it had been pumped, but not all the time. i will try to to adjust at master cylinder see if that helps for the time being.. thanks for the help Quote Link to comment
datzenmike Posted April 28, 2012 Report Share Posted April 28, 2012 I am getting what i think is throw out bearing noise. squeal but only when i have clutch pedal all the way in or while releasing... when pedal is out no noise Well if dry the bearing may not be spinning and it will wear the diaphragm fingers down. The clutch will start to not disengage. Watch the push rod between the slave and the clutch arm and have someone work the clutch. It should move an inch or so. Quote Link to comment
chebetio510 Posted April 28, 2012 Author Report Share Posted April 28, 2012 yesterday while i was bleeding the slave cylinder i did notice movement of the push rod about an inch if not more... i will double check Quote Link to comment
converted_to_datsun Posted May 1, 2012 Report Share Posted May 1, 2012 Mine started doing the same thing yesterday ..... You figure yours out yet? Quote Link to comment
chebetio510 Posted May 2, 2012 Author Report Share Posted May 2, 2012 i adjusted the the master cylinder at the pedal... it does help as far as getting into gears. but the clutch slips.. :/ so i have to bring it back to where it was before.. or mess with it until i get the exact point Quote Link to comment
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