I just installed a new clutch in my 91 240sx and I can't get the pedal right.When the car gets hot I have to much pedal, and when its cold I have to little pedal. There are times that the pedal is just right. I keep messingwith the adjustment on the push rod, but after a while of driving it keeps going out of adjustment.
Any body know anything about this?
clutch adjustment
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InsanityInc
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First i'll tell you why that happens, then I'll explain how to fix it. As liquids heat up, they expand. So, your clutch and brake master cylinders have what's called a compensating port that allows small amounts of fluid to flow in and out of the resevoir to compensate for changes in fluid in the line because of temperature. If your MC is misadjusted, you can block the compensating port so that your line will be under pressure when it's hot, and negative pressure when it's cold.
So, here's what you do. Loosen the lock nut on the MC adjustment rod. Make sure the front blocker is in the stock position (wires leading to the interlock switch shouldn't be twisted). Now, take the cap off the MC and go push the clutch fork back against the slave cylinder (in an S13 you can reach the slave cylinder from under the hood, so you don't need to roll under the car every time). Now, chances are you won't be able to move it (it's easy to tell, if you can it's very easy to move.) So, back off the adjustment rod by screwing it a few threads out of the master cylinder (so the amount of rod inside the thing that connects the rod to the pedal gets bigger). Then check the clutch fork again. Repeat this process until you can shove fluid back into the MC resevoir. Now, once you can, just slowly do it the opposite direction so you can get the minimum amount of free play.
So, here's what you do. Loosen the lock nut on the MC adjustment rod. Make sure the front blocker is in the stock position (wires leading to the interlock switch shouldn't be twisted). Now, take the cap off the MC and go push the clutch fork back against the slave cylinder (in an S13 you can reach the slave cylinder from under the hood, so you don't need to roll under the car every time). Now, chances are you won't be able to move it (it's easy to tell, if you can it's very easy to move.) So, back off the adjustment rod by screwing it a few threads out of the master cylinder (so the amount of rod inside the thing that connects the rod to the pedal gets bigger). Then check the clutch fork again. Repeat this process until you can shove fluid back into the MC resevoir. Now, once you can, just slowly do it the opposite direction so you can get the minimum amount of free play.