lemmiewink

Ok,

So today I was driving down the street. The clutch disengaged and engaged on my r154 beautifully. It was shifting fine. Then suddenly as i step on the clutch after taking the 2jzgte to 5k just to pass someone in 3rd gear. I get locked out. I can't shift into any gear!

The pedal had pressure to it, but not as much as it used to literally 5 seconds before this happened. It was a very noticeable pressure difference.

I quickly pull over to a side street residential area, and after getting a ride to get some tools I inspect the transmission through the inspection plates. Everything seems to be in order. The release hub is not broken.

I try to push on the clutch pedal, it seems that the slave is trying to push the fork and it moves maybe half to 3/4 of an inch. It SEEMS that it is not disengaging all the way.

Maybe air has gotten into my lines. I have a speed bleeder valve on my slave, so I went ahead and started bleeding.

No bubbles. I use up a lot of hydraulic fluid in the process. I try it again and still no dice. It won't disengage at all.

I look at the pedal and look at the clutch rod as i push it in. It seems to go at an angle first, before starting to push into the cylinder. I was searching here on CL where I found this link.

https://www.clublexus.com/forums/per...ch-issues.html


My clevis is upside down to this one.

Could this be the reason I can't disengage?

Is my Master Cyl crap now?

If so, should I rebuild or buy a new assembly?

lemmiewink

Bump. I'll go ahead and order a new master cyl. I took apart the old one and nothing was obvious that I found. What else could make the clutch pedal feel like this?

lemmiewink

Even more bumpage.

lemmiewink

I found this site that sells an extended slave rod.

http://www.speed-source.net/products/pushrod.htm

Anyone have experience with it? Also, what are some ways to cope with the high pressure, pressure plate? I'm thinking a larger diameter master and slave cyl. But who sells it?

RyanV

iTrader: (9)

You can check Supraforums>mkiv>FAQ>crankwalk thread

It is a possibility that you have crank walk or thrust bearing failure.

lemmiewink

Yes I read it pretty thoroughly. I've never started it with the clutch engaged. Did the bypass before I even put the engine in. I doubt I have crank walk. It doesn't have the symptoms that I have read about.

It was a sudden loss of the ability to shift. It was not gradual, but like a switch. First I could shift. Then next moment I can't shift into any gears at all.

lemmiewink

Update.. I re bled the system. Tried again... No Dice. So I tried a little experiment. I used a 1/4 inch drive socket and stuck it at the end of the slave cyl rod. This extended the stroke of the cyl a few millimeters.

I CAN SHIFT AGAIN... Of course this is just a temporary fix until my extended slave rod arrives.

Pedal is still somewhat soft.. and the engagement point has changed dramatically. It used to be near the bottom of the clutch pedal throw, now it is much higher. Roughly around halfway up or so.

Still I've been thinking. If this was the problem, why did it used to NOT be a problem until now? Did something change on the diaphragm of the pp that made it not able to shift suddenly?

Hopefully, I have remedied the problem instead of buying time till the real reason why it couldn't shift pops up again. will update if something changes.

dumdumgreg

iTrader: (5)

lemmiewink
that is pretty puzzling,
too bad no one was able to chime in with something useful
I was looking at the diagrams in the factory manual and Alldata
any chance the slave cylinder could be bad?
also can there be possibly some debris in the line, maybe gunked up in the slave cylinder?

keep us posted

lemmiewink

Changed both the master and the slave. It didnt help any. The only thing that I did not replace was the steel clutch lines and the rubber hose..

I've been posting in supramania and someone said that the rubber hose might be giving out. Maybe that is why it is still a somewhat soft pedal feel. Could be that the slack caused by the expanding hose is being taken up by the slave rod "extension".

This is all speculation. I'll try to test the hose when I have a spare body around to help me.

RyanV

iTrader: (9)

I'm just saying. I installed a used motor one time, and I had the same symptoms, everything was new, and it was thrust bearing failure.

I couldn't shift into any gear because the crank/flywheel/clutch was moving. Pedal feel was soft.

What get's me about this is that it was shifting, now it's not. You've extended the slave rod, and I think I know why it's working.

RyanV

iTrader: (9)

Most definitely...

Durrr

since crankwalk was mentioned, I felt this was appropriate

dejacky

iTrader: (2)

I have a similar anomaly to a lesser degree since my R154 still shifts, just not as smoothly as when the car is cold. I'm also using a very old rubber clutch line and I'll try to change it to a more rigid or SS braided one to see if that remedies the problem. Please keep us posted and thanks for everyone sharing ideas .

dumdumgreg

iTrader: (5)

just curious, what brand ss clutch line did you use?

RyanV

iTrader: (9)

I used the DriftMotion line.