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Unread 08-08-2015, 05:44 PM   #1
1978CJ7Beast
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Slave cylinder for a 78 CJ7?

Stock 1978 CJ7, 304, w/t150 borg warner 3 speed. Does my jeep have a slave cylinder...and if so, where's it located? While driving, lost all pressure in my clutch pedal (went to the floor and stayed there).

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Unread 08-08-2015, 06:00 PM   #2
CSP
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Follow the clutch linkage from the pedal out to the firewall. If it's linkage on the firewall and not a master cylinder with fluid in it you don't have a slave cylinder.


No '79 would have come with a hydraulic clutch (with a master and slave cylinders), but a prior owner could have converted it.
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Unread 08-08-2015, 08:26 PM   #3
1978CJ7Beast
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Thanks CSP. It broke down at around 1:00 am. With a flashlight (and being about 50 minutes from my house), I popped the hood, located the loose clutch pedal linkage coming through the firewall, and could easily pull it in and out (no resistance). Couldn't locate a slave cylinder (but it was dark). Got under the Jeep, and found the bracket (part #5) and linkage (part #2) were just hanging there. Also found a broken zip tie on the ground. So, I zip tied the bracket and linkage back in place (2 bolts holding the bracket were rusted/broke). Got in the Jeep...expecting the spring to provide resistance...but I pushed the clutch pedal in...got very little resistance...and the clutch would still not engage. Put the jeep in first, started it, immediately gave it gas, and managed to time the shifting through 3rd gear all the way home. Will check the firewall again tomorrow for that slave cylinder. Also heard the older models might have a slave cylinder inside the bell housing.
image-3276955139.jpg

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"What will all that chatter and hearsay count (will you even be able to remember it?) when the anaesthetic fog which we call "nature" or "the real world" fades away and the Presence in which you have always stood becomes palpable, immediate, and unavoidable? - C.S. Lewis"
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Unread 08-08-2015, 08:36 PM   #4
1978CJ7Beast
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From underneath, looking at the transmission on the drivers side, the two broken/rusted bokts are circles in white. The bracket that can be swiveled up onto the bolts (which is just hanging here) has an arrow pointed to it.
image-1213506763.jpg

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"What will all that chatter and hearsay count (will you even be able to remember it?) when the anaesthetic fog which we call "nature" or "the real world" fades away and the Presence in which you have always stood becomes palpable, immediate, and unavoidable? - C.S. Lewis"
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Unread 08-09-2015, 08:56 AM   #5
CSP
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If you have linkage coming through the firewall there is no slave cylinder. You still have the stock mechanical linkage.


A hydraulic clutch would have a master cylinder on the firewall like in the upper right of that parts diagram (left is the master, right is the slave) with a hose going to the slave cylinder.


None of the parts in the lower section of that diagram would be present with a hydraulic clutch and master/slave cylinders are only found with hydraulic.
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Unread 08-09-2015, 12:14 PM   #6
1978CJ7Beast
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Thank you! Got under it today, lined up the bracket, and asked my dad to gently push the clutch pedal in. Couldn't hold the bracket on (leverage and spring created too much tension). HOPING i just need to bolt that bracket in place. Also, some pics of the engine bay (can't see a slave cylinder).
image-4266383689.jpg

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"What will all that chatter and hearsay count (will you even be able to remember it?) when the anaesthetic fog which we call "nature" or "the real world" fades away and the Presence in which you have always stood becomes palpable, immediate, and unavoidable? - C.S. Lewis"
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Unread 08-09-2015, 12:14 PM   #7
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image-1811535446.jpg

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"What will all that chatter and hearsay count (will you even be able to remember it?) when the anaesthetic fog which we call "nature" or "the real world" fades away and the Presence in which you have always stood becomes palpable, immediate, and unavoidable? - C.S. Lewis"
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Unread 08-09-2015, 12:15 PM   #8
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image-4258812647.jpg

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"What will all that chatter and hearsay count (will you even be able to remember it?) when the anaesthetic fog which we call "nature" or "the real world" fades away and the Presence in which you have always stood becomes palpable, immediate, and unavoidable? - C.S. Lewis"
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Unread 08-09-2015, 12:16 PM   #9
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"What will all that chatter and hearsay count (will you even be able to remember it?) when the anaesthetic fog which we call "nature" or "the real world" fades away and the Presence in which you have always stood becomes palpable, immediate, and unavoidable? - C.S. Lewis"
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Unread 08-09-2015, 12:16 PM   #10
1978CJ7Beast
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image-3801295289.jpg

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"What will all that chatter and hearsay count (will you even be able to remember it?) when the anaesthetic fog which we call "nature" or "the real world" fades away and the Presence in which you have always stood becomes palpable, immediate, and unavoidable? - C.S. Lewis"
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Unread 08-09-2015, 03:39 PM   #11
CSP
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A clutch with mechanical linkage will not have a slave cylinder. You can stop looking for one.


I don't think you understand what a slave cylinder is. In a hydraulic setup the clutch pedal has a pushrod that pushes in a piston in a clutch master cylinder. This piston forces fluid through a fluid line to a piston in a slave cylinder. This piston pushes a rod which moves the clutch fork.


In yours all of the pieces and parts of the linkage eventually move the clutch fork. There's no fluid or hydraulics or master/slave cylinders involved. Only 1980 and newer CJs with four cylinder engines came with hydraulic clutch setups.
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Unread 08-09-2015, 04:24 PM   #12
1978CJ7Beast
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Thanks CSP. Initially, when I lost clutch pedal pressure, I thought it was a failed slave cylinder. The hanging bracket next to the tranny confused me further. I zip tied the linkage/bracket back together as a temporary fix thinking it "held". Shifted, hit the gas, and when that didn't work...I thought the issue was non-linkage (i.e. Hydronic) related.

Wasn't until today when I noticed my makeshift ziptie solution didn't hold (i.e. I looked under the jeep...and The bracket that I thought was secured which works in conjunction with the spring, actually failed and came loose...hence no pressure). So, there's no hydrolic component to my clutch system (that was implemented as you noted with later models). My issue is linkage and more specifically....a bracket needs to be remounted to create pressure on the pedal (via spring).
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"What will all that chatter and hearsay count (will you even be able to remember it?) when the anaesthetic fog which we call "nature" or "the real world" fades away and the Presence in which you have always stood becomes palpable, immediate, and unavoidable? - C.S. Lewis"
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Unread 08-12-2015, 01:17 PM   #13
1978CJ7Beast
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Just closing this out. Used WD 40 soaked overnight...both broken bolts came out...re-bolted bracket back on with two grade 8 bolts (5/16's X 18 X 2 & 1/2)...and 2 lock washers. Fixed. Thanks!
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"What will all that chatter and hearsay count (will you even be able to remember it?) when the anaesthetic fog which we call "nature" or "the real world" fades away and the Presence in which you have always stood becomes palpable, immediate, and unavoidable? - C.S. Lewis"
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