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Old 07-17-2013, 01:16 PM   #1
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New Clutch Not Engaging Flywheel

I just got through replacing my clutch, pressure plate and slave with a Luk clutch kit. (it's an internal slave so I had to remove the transmission, etc) After lots of work I got it put back together and my worst fear has come through: It doesn't work Here's what's happening:

I bled the slave and it feels firm, although I'm not sure I bled it well enough (there's still a few bubbles that show up occasionally).

I can shift through the gears and the pedal feels OK.

However, when I start it and shift into gear, nothing is engaging the flywheel (ie. no power sent to transmission...car doesn't move)

My thoughts are:

1. I didn't bleed it well enough or I'm doing it wrong. I went through 3/4 bottle of brake fluid, refilling the master cyl. after ever 2 pumps or so. Still seems like there's air in it maybe?

2. The Luk kit said specifically not to break the strap on the slave cyl, that it'll break on it's own. Seemed odd....but I followed that instruction.

3. What else could I have done wrong? (someting installed wrong? I'm a noob...) Can't come up with anything else because it seems pretty straight forward.

Help from my fellow Jeepers?

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Old 07-17-2013, 02:23 PM   #2
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Got the transfer case in gear? Because if you had no fluid in the slave, it would still move.

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Old 07-17-2013, 02:37 PM   #3
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Hmm...didn't think to check the transfer case..that could be it.

However, note what I said about the Luk kit instructions to leave the 'strap' on...I'm thinking maybe if it wasn't bled enough, there's not enough power to break the strap yet, therefore it wouldn't be engaging the flywheel?

But...I like your idea...will have to check that.
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Old 07-17-2013, 02:40 PM   #4
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No, you are backwards. When you step on the clutch it disengages. So if the strap is intact, your Jeep will not go into gear when running, but if you start it in gear it will move.

Stepping on the clutch breaks the strap. So an unbroken strap is the same as not stpeeing on the clutch. Make sense?
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Old 07-17-2013, 02:42 PM   #5
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Ahhh, right, so probably not the strap. Anything else in the actual install that I could have done incorrectly that would cause this? REALLY hoping I dont have to pull the trans again
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Old 07-17-2013, 03:07 PM   #6
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Clutch NOT engaging is USUALLY interference from incorrectly installed pressure plate OR incorrectly installed Throw Out bearing/cylinder (integrated) pushing on pressure plate springs..

ASSUMING you put a new pressure plate in (or your old one was still good, usually is NOT) and your T/O bearing is NOT interfering .... COULD be incorrect clutch plate (wrong thickness) which is not allowing contact.
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Old 07-17-2013, 03:18 PM   #7
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bc3: What you say here is exactly what I fear....but then I think about it, what can possibly be installed incorrectly? You hold up the clutch plate, put in the alignment tool, bolt on the pressure plate. The bearing slides over the input shaft and onto the pin.

I dont doubt I could have done something wrong, I just can't imagine what it could be? Seems like it's pretty dummy-proof.
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Old 07-17-2013, 04:01 PM   #8
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Did you put the clutch disk in backwards?if you did it won't contact the flywheel. What happens when you start your jeep and without pushing the clutch in try and put in gear? Any grinding ?
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Old 07-17-2013, 04:21 PM   #9
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Yeah, I was paranoid when I put it in to make sure the disc was facing the right way...so unless my brain turned off the moment I put it in, it should be right.

When I shift with no clutch it does grind...so that must be a good sign, right?
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Old 07-17-2013, 06:49 PM   #10
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Ok, good progress thanks to you guys!

The major problem was indeed the transfer case not being engaged at all...man, I never would have thought of that. Big thanks to JoeyT on that one!!

I also thoroughly bled the clutch and I think this helped too. A quick question on that, though:

Before this bleed, the clutch actually seemed firmer even though there were air bubbles left. Once I got it all bled out, it seems softer than it was before. Anything I can do to adjust that and get it firmer again? I used a 1-man bleeder and tightened the screw with the pedal down...would that make it softer? Should I try it with the pedal up?

I did get the thing to move...but now I have other issues that you can read about here.

Thanks guys, I really appreciate the feedback!
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Old 07-17-2013, 07:02 PM   #11
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glad I was wrong........
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Had 75CJ5, 89YJ, 93YJ. Have 82CJ7 & 95YJ____Not one burnt yet due to lack of relays.
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Old 07-17-2013, 07:03 PM   #12
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me to bc3!! me too!!

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