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S10 hydraulic clutch pump problems

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Old 11-01-2011, 08:53 PM   #1
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S10 hydraulic clutch pump problems

Trying to get the old s10 running, have a 97? s10 with a hydraulic clutch(manual tranny), has no resistance on the clutch pedal, If I remember correctly it lost a little fluid, then quit working all together. Is there parts diagrams out there? I don't have an opportunity to take this to a true mechanic to troubleshoot and repair, or even a dealer.

Thanks
Old 11-02-2011, 04:20 PM   #2
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Re: S10 hydraulic clutch pump problems

air in the master cylinder

if the cylinder is angled so that the bottom of the cylinder the end at the firewall is higher than the line outlet to the slave cylinder then youll have to do a special trick to burp out the air out of the master cylinder

how i do it is i get in under the dash and remove the clip that holds the piston in the back of the cylinder and slowly carefully allow the piston to come out of the back of the cylidner housing enough to let the air out and then stick it back in and stick the clip back in



i learned this trick when doing a ford ranger one, once, when we were having no luck at all bleeding the clutch system out, after replacing clutch and slave and master cylinders

it worked great!

its just what you have to do on many of them
Old 11-05-2011, 05:07 PM   #3
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Re: S10 hydraulic clutch pump problems

I played with it a little, took out the master cylinder from the firewall tried to bleed it, the piston that pumps in the cylinder feels a bit loose, I'm guessing that is worn out, is there a bleeder screw on the slave cylinder? I traced the line to the clutch but its enclosed, it is a 98, and from searching I understand that the early model slave cylinders are outside of the clutch and can be removed with ease, and the later has the slave inside the clutch?
Old 11-09-2011, 08:54 AM   #4
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Re: S10 hydraulic clutch pump problems

I just replaces my fly wheel, pressure plate, clutch plate, release bearing (slave cylinder), master cylinder, pilot bushing (not a bearing) on my 1998 5 speed. What a pain in the ass. The slave cylinder slides over the spline in the trans and bolts to the houseing. There is a bleed valve right above the connection where the hydraulic line attaches. Bleed the entire line from there. And the push rod going into the master cylinder will have play in it.
Old 11-09-2011, 09:20 AM   #5
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Re: S10 hydraulic clutch pump problems

Quote: Originally Posted by tug_speedmen
I just replaces my fly wheel, pressure plate, clutch plate, release bearing (slave cylinder), master cylinder, pilot bushing (not a bearing) on my 1998 5 speed. What a pain in the ass. The slave cylinder slides over the spline in the trans and bolts to the houseing. There is a bleed valve right above the connection where the hydraulic line attaches. Bleed the entire line from there. And the push rod going into the master cylinder will have play in it.
true. More than likely, the slave let go
Old 11-17-2011, 09:06 PM   #6
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Re: S10 hydraulic clutch pump problems

Thanks alot guys, I have the new master cylinder in, does anyone remember what size is the bleeder screw? I'm not being lazy, my allen heads seem too long, and before I grind them down to find out what size it is first, thanks.
Old 11-18-2011, 04:46 AM   #7
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Re: S10 hydraulic clutch pump problems

OK sorry no allen heads, after removing some dirt, getting some good light, and removing the brace to the rear differential, I found out its a 7/16", got that bled and it pumps, but its not engaging the clutch so looks like the slave cylinder is shot too. Is there a gaurd around the clutch that can be taken off with out taking the clutch off? Or do I have to remove the clutch to change it out? Sorry for all the questions, I've changed out hoses, front end arms, first time working on the tranny for me.
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Old 11-18-2011, 05:50 AM   #8
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Pretty sure you gotta pull the trans. Dont start pulling it out until someone who knows for sure chimes in
Old 11-21-2011, 05:04 PM   #9
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Re: S10 hydraulic clutch pump problems

I highly recommend buying an owners manual. I know for a fact the 98 s10 the slave cylinder is round and is fitted around the spline coming out of the trans. The whole trans has to come out. I am not Bullshitting you. But where does the hydraulic line plug into? Does it plug into a port that comes out of the trans or does it plug it into an external device?
Old 11-28-2011, 12:59 AM   #10
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Re: S10 hydraulic clutch pump problems

I am replacing my slave cylinder in my 98 s10 4x4 idk what your application is but I had to pull the t case and the tranny the slave cylinder is right in side the bell housing of the tranny it is kinda a pain but like every thing can be done
Old 11-28-2011, 01:08 AM   #11
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Re: S10 hydraulic clutch pump problems

I am doing the same on my 98 s10 4x4 idk your application but on mine you have to pull the t case tranny and the slave cylinder is bolted to the inside of the tranny they call it an Inline slave. Yes it is a Pain. But like every thing it can be done with the right tools and knowledge

Idk how to upload pics from my phone I can show you how mine is set up


Good luck
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Old 11-28-2011, 02:01 PM   #12
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Re: S10 hydraulic clutch pump problems

Yes you have to remove the transmission. The hydraulic line runs from the master cylinder to the slave cylinder on the driver side of the transmission just below the bleeder. It has a white plastic retainer, clean it off you'll see it easier then. I use 2 flat heads to push the retainer into the slave then it will unseat the tabs that are locking the line onto the slave. They make a tool for it, available at most parts stores. Pic below.

The first time i pull my trans i just used a floor jack to support the weight while a buddy and i balanced it on either side. Now i have this transmission jack from harbor freight that raises from like 8in to 24in or so.

Also the manual says to either pull the seats then the carpet to get to the shift boot screws. Or to cut the carpet to get to them. Dont do either of these, push the boot down a bit to expose the bottom of the shifter knob, use a large wrench to remove the shifter. Then when you have the cross member removed but the trans still bolted to the bell housing lower the rear of the trans down. Use a 1/4in wrench preferably ratcheting to remove the 4 screws holding the lower half of the shifter into the transmission and pull it up into the shifter boot. Ive used string to hold it up out of the way tieing it to the oh shit handle in the cab.

This will save you hours of time.

Old 11-28-2011, 05:19 PM   #13
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Re: S10 hydraulic clutch pump problems

I have a '78 Toyota Celica with a '63 Buick 3.5 litre V8 and '86 Camaro T5 in it. I had to install one of these slave cylinders to get the right travel to disengage the clutch. It was expensive - $225 from the McLeod clutch guys. It is almost the exact same unit as the one in a Dime.
I would definately try bleeding the assembly before I pulled everything apart to replace it. Start with gravity bleeding. Make sure that there is plenty of juice in the reservoir, pump the clutch 15 - 20 times, wait, do it again, repeat this about 10 times. Go underneath and open the bleeder and watch the juice come out. You will see air bubbles. Once it runs clear (Juice) close bleeder and pump the BAG out of the pedal - like 30 or 40 times. I bet you get a clutch back.
Confucius say: Man with crappy clutch have tired leg...
Old 12-03-2011, 04:43 AM   #14
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Re: S10 hydraulic clutch pump problems

Bled it again today, can see the clutch trying to engage, it engages about 3/32", still will not allow to shift the gears while running. What is the normal engagement travel?
Old 12-05-2011, 11:44 AM   #15
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Re: S10 hydraulic clutch pump problems

Try pumping the bag out of it. Eventually it will come around.
The engagement point is anywhere between 1/2" off of the floor to 2 1/2" off the floor (about mid way travel of the pedal)
Old 12-07-2011, 12:49 AM   #16
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Re: S10 hydraulic clutch pump problems

I should have been more clear, I meant the clutch, looking under the clutch in the "sand hole" as my buddy calls it, when the pedal is pumped and fully compressed, the clutch engages about 3/32" of an inch.
Old 12-08-2011, 10:46 PM   #17
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Re: S10 hydraulic clutch pump problems

Quote: Originally Posted by s10-4
I should have been more clear, I meant the clutch, looking under the clutch in the "sand hole" as my buddy calls it, when the pedal is pumped and fully compressed, the clutch engages about 3/32" of an inch.
You still dont have all the air out of the system then. That thing should move a whole lot more than that. Its the clutch inspection plate. never heard it called the sand hole.
Old 02-27-2013, 06:14 PM   #18
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Re: S10 hydraulic clutch pump problems

How come no body ever replies back after they had their issue fixed????
Old 03-05-2013, 05:58 PM   #19
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Question Re: S10 hydraulic clutch pump problems

Can u help? I have a 98 2.2l S10.. The truck wont shift into gears using the clutch, if i hold it like im going into any gear it wants to go, it rolls slowly, however doesnt go into gear. Moving it around after i bought it, it jumps in gear and stalls out.. I assume the clutch is shot. Would u say the whole clutch is bad? Are there other things I should do first?
Old 03-05-2013, 09:17 PM   #20
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Re: S10 hydraulic clutch pump problems

Your hydraulics are gone, you have air in the system and can't make enough pressure to release it.

Lots of threads on bleeding clutches.

You can replace the master cylinder easy enough but if the slave needs replacing then you have to pull the transmission, at that point you might as well do the complete clutch.

I'll post a link to a bleeding thread in a moment, here; http://www.s10forum.com/forum/f13/po...13/?highlight=
Old 11-13-2013, 01:32 AM   #21
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Re: S10 hydraulic clutch pump problems

we have a 1999 S10 extreme we replaced the clutch and master cylinder and slave cylinder and been trying to bleed it now for 3 days. But pedal will not get stiff. we tryed gravity bleeding still no luck. We did put the clutch in backwards and tryed to bleed it would this have messed up the slave cylinder. We took the tranny all apart and turned the clutch around still no peddle
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