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| tobijohn | Guess it's time to replace the clutch slave cylinder... | ||
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Senior Guru
 
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The time between reservoir refills is getting closer and closer. No apparent leaks around the master, no fluid under the carpet so I'm assuming it's the slave that's leaking and the clutch dust is soaking everything up (nothing on the garage floor, either). I know as recently as a year ago there were problems with the quality and assembly of the replacements but was wonderig if that situation has been resolved. I also found Central Coaster's and Josh's threads and will read them in depth before doing anything but would welcome opinions on my choices of brands. Price isn't the primary concern but quality is. Rock Auto has the following in stock:
RHINOPAC ($66) DORMAN ($67) WAGNER ($77) PERFECTION CLUTCH ($83) ACDELCO ($91) Anyone have any decent miles on any of the above? I'm not married to the Rock Auto selection so if anyone has a recommendation outside of the above, that's fine too. TIA... |
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Posted on: 2009/11/21 22:37
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John 1996 LT4 coupe black/black 160 Tstat, K&N, Hypertech PPIII (for the fans), CAGS, Nitto 555 EPs, 275/315s, Chrome A-molds, a little tint and some black-outs AIRFOIL FREE! |
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| bogus | Re: Guess it's time to replace the clutch slave cylinder... | ||
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Grand Imperial Pooh-Bah
 
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The one I bought is a NAPA part, made in Taiwan.
It is a one piece cast part and seems very nicely made. It has been in the car now for 2 months+ and is working VERY well. |
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Posted on: 2009/11/21 23:00
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| tobijohn | Re: Guess it's time to replace the clutch slave cylinder... | ||
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Thanks Andy, do you recall what you paid for it? |
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Posted on: 2009/11/21 23:35
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John 1996 LT4 coupe black/black 160 Tstat, K&N, Hypertech PPIII (for the fans), CAGS, Nitto 555 EPs, 275/315s, Chrome A-molds, a little tint and some black-outs AIRFOIL FREE! |
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| Mekanic | Re: Guess it's time to replace the clutch slave cylinder... | ||
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If you look at the pics on rockauto, I'm almost positive the Wagner is cast
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Posted on: 2009/11/22 2:40
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~Rich Polo LT4 Yea tho I walk through the valley in the shadow of rice, I shall fear no turbo, for torque art with me. |
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| CentralCoaster | Re: Guess it's time to replace the clutch slave cylinder... | ||
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I would highly recommend the cast unit.
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Posted on: 2009/11/22 6:40
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| bogus | Re: Guess it's time to replace the clutch slave cylinder... | ||
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Grand Imperial Pooh-Bah
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I don't remember off hand. I will have to rifle through my stack of reciepts.
It shows about $83.00 online, but the picture doesn't match the part I got. The cast part also has a textured finish. I like the idea of the cast part, because the OEM appears to be two pieces welded. I am nearly certian that the joint was leaking on my old slave. There was just a lot of moisture right there at the seam where the bump happens. |
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Posted on: 2009/11/22 17:19
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| tobijohn | Re: Guess it's time to replace the clutch slave cylinder... | ||
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Anybody know what the "offical" part number is for the slave? The FSM calls it a clutch actuator cylinder but I can find no reference to it in the C$ parts number michrofiche. In fact, the only references to "clutch" in the parts list are for the AC compressor clutch and AT clutch packs. The only reference to actuators is to headlights and a few other things not related to the manual transmission. In fact, I can't find anything in the microfiche related to the manual transmission clutch...
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Posted on: 2009/11/22 18:16
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John 1996 LT4 coupe black/black 160 Tstat, K&N, Hypertech PPIII (for the fans), CAGS, Nitto 555 EPs, 275/315s, Chrome A-molds, a little tint and some black-outs AIRFOIL FREE! |
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| bogus | Re: Guess it's time to replace the clutch slave cylinder... | ||
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Grand Imperial Pooh-Bah
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10147948
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Posted on: 2009/11/22 20:30
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| tobijohn | Re: Guess it's time to replace the clutch slave cylinder... | ||
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Quote:
Thanks Andy. Someone also emailed me the number 12509313 which corresponds to the same part number listed for the Dorman slave at Rock Auto. The two AC Delco slaves list numerous part numbers (one mentions #19183276, the other mentions it replaces 18030212 #18030212, 19176972. Also the Dorman mentions an 1 1/16" bore while the Wagner mentions an 11/16" bore. I'm starting to get a bit confused... |
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Posted on: 2009/11/22 21:03
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John 1996 LT4 coupe black/black 160 Tstat, K&N, Hypertech PPIII (for the fans), CAGS, Nitto 555 EPs, 275/315s, Chrome A-molds, a little tint and some black-outs AIRFOIL FREE! |
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| bogus | Re: Guess it's time to replace the clutch slave cylinder... | ||
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I would normally recommend just getting what Rock Auto sells, however, unless it is the Wagner, I would get the NAPA.
Also, the smaller bore would make for more pressure and potentially a faster clutch action. |
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Posted on: 2009/11/23 6:39
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| Josh | Re: Guess it's time to replace the clutch slave cylinder... | ||
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You can't go by the pictures as to whether or not the slave is cast. I work for an autoparts store and we have both the cast and platic units under the same part number. The only way to tell is to open the box and look.
Make sure you get a cast unit, beyond that I don't think it matters much. Take it apart, clean the bore, and verify the orientation of the seal. EDIT: I have a cheap plastic one in my car from a chain auto parts store. I cleaned the bore and flipped the seal to the correct direction before I installed it. It's got 15K or so on it now with no leaks. |
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Posted on: 2009/11/23 16:22
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| BrianCunningham | Re: Guess it's time to replace the clutch slave cylinder... | ||
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Is your leak caused by this?
http://www.zfdoc.com/CHS_Actuator_Seal_Fault.htm Quote: We found the cause of the problem of which many C4 ZF Clutch Hydraulic Systems were having operational problems during the last several years. As of June 2008, GM discontinued selling both the master and actuator cylinder. The actuator (slave) cylinder seals have been installed backwards during manufacturing assembly. We disassembled three brand new slaves and all had the seal installed backwards. |
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Posted on: 2009/11/23 16:32
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Polo Green 95 LT1 6-spd http://mysite.verizon.net/vzevcp74/ 383 LT1/Vortech Supercharger/AFR heads/Rod end suspension/Penske-Hardbar dual rate coilovers/Wilwood 6pot brakes NCCC Governor: http://BayStateCorvetteClub.com |
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| CentralCoaster | Re: Guess it's time to replace the clutch slave cylinder... | ||
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One of the DOM (smooth drawn-over-mandrel) units I bought had an aluminum piston. Moisture in the fluid allowed the aluminum to corrode the steel, basically turning it into the anode of a battery.
The inner wall was badly pitted and corroded, as soon as the oring got to that point it would no longer hold pressure. It also allowed it to suck air into the system making it impossible to bleed. My cast PBR (reboxed China part) had a steel piston. |
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Posted on: 2009/11/23 20:58
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| CentralCoaster | Re: Guess it's time to replace the clutch slave cylinder... | ||
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On your list there I'd expect the Wagner to be cast and the Delco to be DOM.
As far as I know the original was always DOM, the cast units were made as a cheap aftermarket replacement. Funny that they are superior to the original. |
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Posted on: 2009/11/23 21:00
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1985 Z51, ZF6 |
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| tobijohn | Re: Guess it's time to replace the clutch slave cylinder... | ||
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Thanks for all the input. I'll order the Wagner and let you know. I was thinking of calling them first to confirm but based on Josh's post, there might not be any point. If it turns out the seals are backwards in the one that's in there now as Brian mentioned, then I guess I'll have something for the next Pay It Forward thread...
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Posted on: 2009/11/26 13:08
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John 1996 LT4 coupe black/black 160 Tstat, K&N, Hypertech PPIII (for the fans), CAGS, Nitto 555 EPs, 275/315s, Chrome A-molds, a little tint and some black-outs AIRFOIL FREE! |
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| tobijohn | Re: Guess it's time to replace the clutch slave cylinder... | ||
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Just out of curiosity, does anyone know if the slave is a Corvette only part or are there other vehicles that use it too? I know the ZF trans is used in other cars but I'm wondering if the clutch and related parts are specific to the ZF C4s...
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Posted on: 2009/11/28 1:30
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John 1996 LT4 coupe black/black 160 Tstat, K&N, Hypertech PPIII (for the fans), CAGS, Nitto 555 EPs, 275/315s, Chrome A-molds, a little tint and some black-outs AIRFOIL FREE! |
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| CentralCoaster | Re: Guess it's time to replace the clutch slave cylinder... | ||
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89-96 Corvette only.
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Posted on: 2009/12/1 5:59
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1985 Z51, ZF6 |
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| tobijohn | Re: Guess it's time to replace the clutch slave cylinder... | ||
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Wow, I'm suprised there are so many diferent choices. Unless it's basicly a couple manufacturers with the same part just being re-branded... |
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Posted on: 2009/12/3 0:52
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John 1996 LT4 coupe black/black 160 Tstat, K&N, Hypertech PPIII (for the fans), CAGS, Nitto 555 EPs, 275/315s, Chrome A-molds, a little tint and some black-outs AIRFOIL FREE! |
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| CentralCoaster | Re: Guess it's time to replace the clutch slave cylinder... | ||
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Yup, two different parts, ten different boxes.
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Posted on: 2009/12/3 3:26
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| tobijohn | Re: Guess it's time to replace the clutch slave cylinder... | ||
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Well, for the first time, I noticed some fluid on the garage floor under the passenger side. I called RhinoPac Friday and they said their slave was cast. I'll call the rest of the manufacturers next week just to see but I'm ordering a Rhinopac replacement today. Looking in the FSM, the job looks simple enough but if anyone has any tips or tricks for this novice, I'd appreciate it, thanks...
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Posted on: 2009/12/6 16:08
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John 1996 LT4 coupe black/black 160 Tstat, K&N, Hypertech PPIII (for the fans), CAGS, Nitto 555 EPs, 275/315s, Chrome A-molds, a little tint and some black-outs AIRFOIL FREE! |
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| tobijohn | Re: Guess it's time to replace the clutch slave cylinder... | ||
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Update: The Rhinopac clutch slave got here today and it IS cast....
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Posted on: 2009/12/11 3:08
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John 1996 LT4 coupe black/black 160 Tstat, K&N, Hypertech PPIII (for the fans), CAGS, Nitto 555 EPs, 275/315s, Chrome A-molds, a little tint and some black-outs AIRFOIL FREE! |
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| bogus | Re: Guess it's time to replace the clutch slave cylinder... | ||
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cool!
Install is rather easy, but I would bench bleed the master first... if you can get a phoenix injector, get one, it will make bleeding a ton easier. Air is your enemy!!!! I used a brake bleed pump, draws the fluid in, just be sure you have a helper to keep the reservoir full! tighten it up and pump up the pedal to get pressure. Do a couple of clutch drops, meaning, push pedal to floor and let it fly up quickly. It will take a few miles for the system to fully set in. |
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Posted on: 2009/12/11 14:05
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| CentralCoaster | Re: Guess it's time to replace the clutch slave cylinder... | ||
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If there's enough room in your engine compartment to thread the slave cylinder up through and next to the master, all the while still bolted up to the clutch hose... then do that.
I did this and was able to bleed my clutch system by hand right there in front of me, and then install it. I left the master bolted to the car (because you don't want to tip it) and just used the pedal. I bled the system both directions until I was sure all the air was out. A phoenix tool sound good too, although I've never used one. |
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Posted on: 2009/12/11 21:42
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| BrianCunningham | Re: Guess it's time to replace the clutch slave cylinder... | ||
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Having to yank the computer out to fill it is rather annoying.
then again I've only had to do it ONCE. |
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Posted on: 2009/12/11 21:44
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Polo Green 95 LT1 6-spd http://mysite.verizon.net/vzevcp74/ 383 LT1/Vortech Supercharger/AFR heads/Rod end suspension/Penske-Hardbar dual rate coilovers/Wilwood 6pot brakes NCCC Governor: http://BayStateCorvetteClub.com |
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| tobijohn | Re: Guess it's time to replace the clutch slave cylinder... | ||
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I'm getting pretty good at it seeing as how I now have to top it off every 25 miles or so. I was all set to try to get the new one in tomorrow morning and then I read over at the other place that DOT3 brake fluid isn't good enough and I need to get something that's only available through GM... |
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Posted on: 2009/12/13 0:19
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John 1996 LT4 coupe black/black 160 Tstat, K&N, Hypertech PPIII (for the fans), CAGS, Nitto 555 EPs, 275/315s, Chrome A-molds, a little tint and some black-outs AIRFOIL FREE! |
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| Mekanic | Re: Guess it's time to replace the clutch slave cylinder... | ||
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Yeah, need to go to the stealership and get their clutch fluid. It has some kind of friction modifier in it, if you use regular DOT3, your MC will squeak. |
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Posted on: 2009/12/13 0:25
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~Rich Polo LT4 Yea tho I walk through the valley in the shadow of rice, I shall fear no turbo, for torque art with me. |
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| CentralCoaster | Re: Guess it's time to replace the clutch slave cylinder... | ||
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F' them. Just get the DOT3. It won't squeak 95% of the time.
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Posted on: 2009/12/13 7:47
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| Mekanic | Re: Guess it's time to replace the clutch slave cylinder... | ||
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I topped mine off with DOT3 over a yar ago and it still sqeaks every time lol
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Posted on: 2009/12/13 11:20
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~Rich Polo LT4 Yea tho I walk through the valley in the shadow of rice, I shall fear no turbo, for torque art with me. |
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| Z51L9889 | Re: Guess it's time to replace the clutch slave cylinder... | ||
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I made a bleed fixture for the slave cylinder out of a flat piece of steel and a couple of bolts. The plate has two holes drilled in it at the same spacing as the slave cylinder flange and a partially drilled hole in between to locate the pushrod. This cost me about $1.00 and 10 minutes of time.
Let the slave hang under the car and attach the plate to the slave with a couple of nuts and bolts. I then let the cylinder gravity bleed for a bit. Tighten the bolts to fully compress the pushrod -- this reduces the fluid volume in the slave cylinder to almost nothing. Next, have a helper depress the clutch and crack the bleed fitting. Repeat a couple of times until all the air is out, then slowly back off the bolts while making sure you keep fluid in the reservoir. The slave cylinder will fill with fluid and be totally free of air. I was replacing slaves about every 2 years until I made this fixture. I had about 5 years on the current slave when I parked the car 4 years ago. It has not leaked a drop. |
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Posted on: 2009/12/14 18:08
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| tobijohn | Re: Guess it's time to replace the clutch slave cylinder... | ||
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That is a great idea, thanks!
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Posted on: 2009/12/15 2:56
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John 1996 LT4 coupe black/black 160 Tstat, K&N, Hypertech PPIII (for the fans), CAGS, Nitto 555 EPs, 275/315s, Chrome A-molds, a little tint and some black-outs AIRFOIL FREE! |
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| Dads90 | Re: Guess it's time to replace the clutch slave cylinder... | ||
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I found that removing the lower mounting bolt, made it easier to mount the slave cylinder, pressure in the boot makes it very hard to push the slave onto the mounting bolts. then thread the lower bolt into the bell housing and the nut should have enough thread to catch and tighten down.
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Posted on: 2009/12/17 4:14
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1990 Silver Blue Metallic, ZF6, Hurst shifter, Z51, Dana 44 3.33 ratio, FX3 system, mostly stock. 
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| tobijohn | Re: Guess it's time to replace the clutch slave cylinder... | ||
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Quote:
Do you recall if your replacement was cast or DRM? I saw a few posts over at the other place where it was tough getting the cast ones on as its flange was thicker that the OEM style. BTW, just picked up a couple cans of the GM fluid at the local dealership - $10 for 8.5oz... |
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Posted on: 2009/12/18 22:35
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John 1996 LT4 coupe black/black 160 Tstat, K&N, Hypertech PPIII (for the fans), CAGS, Nitto 555 EPs, 275/315s, Chrome A-molds, a little tint and some black-outs AIRFOIL FREE! |
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| jmartynuska | Re: Guess it's time to replace the clutch slave cylinder... | ||
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Is the L98 Dorman slave from Rock Auto cast or DOM?
The Dorman listing for a replacement slave for a 1989 references GM part number 10147848 as mentioned earlier in the thread. The Dorman L98 slave is about $20 more expensive than the LT1 slave, the Wagner about $40. Are the slaves interchangeable between L98 and LT1 cars? Looks like I've put it off long enough; "Fill the clutch fluid and check the gas, please" |
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Posted on: 2010/1/13 21:18
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| bigmoe | Re: Guess it's time to replace the clutch slave cylinder... | ||
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[quote]
Z51L9889 wrote: I made a bleed fixture for the slave cylinder out of a flat piece of steel and a couple of bolts. The plate has two holes drilled in it at the same spacing as the slave cylinder flange and a partially drilled hole in between to locate the pushrod. This cost me about $1.00 and 10 minutes of time. [quote/] Got a picture of that? |
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Posted on: 2010/1/14 5:28
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