Proper Way to Flush Hydraulic Clutch?

[Mr. Notorious]

Hey guys, my rig has a SM465 tranny with a hydraulic clutch. I have two quick questions.

The first is the master cylinder (on the firewall) leaks a little bit. For example, if it sits for a couple days I have to pump the clutch a few times to build up enough pressure to shift into gear. Where's the best place to buy a replacement? My '67 didn't come stock with a hydraulic clutch did it? If I need to take a digi pic of it let me know...

The second and more importantly is how should I got about flushing it? The previous owner seemed to take no interest in keeping the fluid clean. Mud actually looks cleaner than the reservoir. It got so bad that after sitting for awhile and the fluid leaked out, I was able to wipe the brown sludge off the inside walls. YUK!! But now, I think it finally plugged up for good. I try and pump the clutch and I get no resistance. I was thinking of disconnecting the line right before the tranny and pumping it. Or go the other way and hook up a shop vac to the reservoir and suck it up and out... I just hope the muck hasn't gotten into the slave and ruined it ... What would you're plan of attack be?

Thanks for your help...

 

[CruisinGA]

you should replace both the slave and master together.

Yes '67 had a hydraulic master.

replace both, bench bleed the slave like a brake master cylinder (cut off some old hard line fittings and screw into the master with a small rubber tube going back into the resevoir-pump until there are no more bubbles)

Then bleed the system like you would a brake system.

 

[Mr. Notorious]

But is the slave cylinder for the sm465 internal? In other words wouldn't I have to remove the tranny?? If it is external, would both the slave and the master be toyota? Or chevy? Or a mix?

 

[honk]

But is the slave cylinder for the sm465 internal? In other words wouldn't I have to remove the tranny?? If it is external, would both the slave and the master be toyota? Or chevy? Or a mix?

Follow the line from the master cylinder to find the slave.
In all likelyhood it's a Toyota slave mounted outside the bellhousing.

You have a non stock truck. How do you expect people to know how to answer your questions without seeing what you have? Have you looked at it yourself?

 

[fjwagon]

When I install a master cylinder, I usually install it and then bleed it with a kit you usually get when you buy MC. If you don't have one you can find at you local auto part store or fab your own. Basicly you connect the out put and route the hose back in the resivour and pump it slowly so you can the air out. Reconnect the lines and bleed the wheel cylinders or slave next.

From my experience, you either have air in the system because it leaked completely out or the seals are going bad.

 

[Mr. Notorious]

Well I finally was able to get under there and take a look. The slave is thankfully external (my jeeps were always internal ) and I'm pretty sure it's a toyota. I went to Advanced Auto and saw a pic of the slave and it looks to be indeed Toyota. Plus the bracket and washers to allign the slave makes it seem like the previous owner wanted the Toyota slave to work. Hopefully he kept the same year and didn't need to change the throw. Here's a couple pics of the slave, tell me if I'm mistaken.

But the problem came when I wanted to replace the master cylinder (which is leaking). Toyota Dealerships parts program only goes back to '69, so they couldn't get me anything. Went to a local Cottman transmission and they said they only get their manual parts from the dealer of advanced auto. Advanced Auto only has a rebuild kit which just looks like bushings and seals... I'd rather replace the entire master. Will the '69 work or should I look elsewhere for the '67?

Shot a quick pic of the master just incase it stands out to anyone that it's not toyota...

Thanks for the help, can you tell I'm a FJ newbie yet?

 

[Degnol]

Well I finally was able to get under there and take a look. The slave is thankfully external (my jeeps were always internal ) and I'm pretty sure it's a toyota. I went to Advanced Auto and saw a pic of the slave and it looks to be indeed Toyota. Plus the bracket and washers to allign the slave makes it seem like the previous owner wanted the Toyota slave to work. Hopefully he kept the same year and didn't need to change the throw. Here's a couple pics of the slave, tell me if I'm mistaken.

But the problem came when I wanted to replace the master cylinder (which is leaking). Toyota Dealerships parts program only goes back to '69, so they couldn't get me anything. Went to a local Cottman transmission and they said they only get their manual parts from the dealer of advanced auto. Advanced Auto only has a rebuild kit which just looks like bushings and seals... I'd rather replace the entire master. Will the '69 work or should I look elsewhere for the '67?

Shot a quick pic of the master just incase it stands out to anyone that it's not toyota...

Thanks for the help, can you tell I'm a FJ newbie yet?

Well, that does not look like a Toyota Slave to me, but I could be wrong. The later master cylinder will bolt right up and work just fine.

GL

Ed

 

[rsc71]

looks like the one on my 68...hard to find replacements for it but i think SOR sells a master, slave ,hose combo for that year

 

[Mr. Notorious]

looks like the one on my 68...hard to find replacements for it but i think SOR sells a master, slave ,hose combo for that year

Yup they do, I found it. But it's $180. I would rather just get a price for the master since it's leaking... which of course they don't sell seperatly


According the the pic, my slave looks pretty close to the Toyota one. The only thing it doesn't have is the "bracket" where the spring is connected like on mine... Plus the two mounting holes on the Toyota are much longer, mine are more flat... I wonder if that makes it GM

 

[Degnol]

The first pic is one from a '66 and the second from a '77.


GL

Ed

 

[Mr. Notorious]

Thanks for the reply and pictures. My slave is pretty close to the first pic that was posted because mine does not bolt through the arm like the second picture. I went to the dealership and found out they wanted $140 for just the '69 Master cylinder. I did a little research on the years that my drivetrain supposibly came from ('78). I looked through Adavnced Auto's website and I'm pretty sure that pre '84 used something more like internal slaves or throwout bearings because regular external slaves are unavailable. And the post '84 external slaves don't look anything like what I have. They look like this...

http://www.partsamerica.com/product_images/AAP/TRQ/PA081281.jpg

So I'm pretty sure that I'm going to get the kit from SOR. Tomorrow I'm going to measure the amount of throw my slave puts out. I'm also going to measure how much rod is exposed when the clutch in engaged and disenaged. Would anyone with a stock toyota slave cylinder mind taking the same measurements for me?

 

[rsc71]

there is one guy on EBay that has a master for that year ...planetautoparts is his ebay name
right now he has one for a 71-74 for 42.99

 

[Mr. Notorious]

there is one guy on EBay that has a master for that year ...planetautoparts is his ebay name
right now he has one for a 71-74 for 42.99

Thanks I sent him an email...

 

[Mr. Notorious]

Well my slave took a turn for the worst and started dripping fluid too Looks like I'll need both now.

But I bled the system and immediately took a measurement while the fluid was spraying on me. It seems that my slave has a throw of 1", maybe if it wasn't leaking up to 1-1/4". The rod is protruded out at 1" and when the clutch is pressed it sticks out 2". Any of you guys with a stock toyota slave cylinder mind taking some measurements to see how far it throws when the clutch pedal is pressed? I'd like to order it from SOR tomorrow as long as mine has the same throw as you other toyota guys. Thanks.

 

[Mr. Notorious]

Shoot, Degnol you seem to be right. I was severly overlooking it. My mounting holes straddle (top and bottom) the slave cylinder; the toyota ones are both below the slave. Great, now I need to try and figure out what kind of slave it is.