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bonanzace
Samba Member
Joined: December 21, 2003
Posts: 55
Location: Denver,Colorado
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 Posted: Mon Feb 20, 2017 4:35 am Post subject: Hydraulic clutch locked up |
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I am asking here because you guys have the most experience on hydraulic clutches. Jamar master and slave. Engine is out so I can watch the clutch arm and bearing movement. When I press the pedal the throw out bearing pivots and comes out but will only retract when I loosen the slave bleeder. After I push the pedal it remains hard and cannot be pushed down again until I release the pressure at the bleeder.Searched and can't find any topics on this. Could there be a relief valve in the master that is sticking?
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1957 Fiat 500 Subaru STI engine G50 trans
1967 Spatz dune buggy Subaru 2.5
1971 Ecotec powered panel
1927 Ave-T track roadster
Laxin like a zombie in the back of a kombi |
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jdcool4
Samba Member
Joined: September 19, 2010
Posts: 98
Location: Temperance MI
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| Posted: Mon Feb 20, 2017 6:08 am Post subject: Re: Hydraulic clutch locked up |
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| If you have a rubber flex line in the system it may be collapsed allowing the master to force fluid past but not return |
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turboblue
Samba Member
Joined: October 09, 2003
Posts: 4216
Location: Central Indiana
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| Posted: Mon Feb 20, 2017 7:16 am Post subject: Re: Hydraulic clutch locked up |
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Sounds like the seals are leaking internally letting fluid get past into the blind end and "hydraulicing" the slave.
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Gary
Turbo VW Sand Drag Buggy
"If you don't run into the Devil every once in awhile, you must be going in the same direction!" |
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yitzac1990
Samba Member
Joined: November 06, 2016
Posts: 75
Location: Huntsville, AL
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| Posted: Mon Feb 20, 2017 8:15 am Post subject: Re: Hydraulic clutch locked up |
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| im curious, why are you playing with the clutch when the engine isnt even installed? the pressure plate is what returns the pedal back to its spot after you press the pedal down. since the engine isn't installed, there is no pressure plate, meaning there is nothing causing the fluid to go backwards, returning the pedal and everything back to its "non-pushed" state. |
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Dale M.
Samba Member
Joined: April 12, 2006
Posts: 20379
Location: Just a tiny bit west of Yosemite Valley
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| Posted: Mon Feb 20, 2017 10:57 am Post subject: Re: Hydraulic clutch locked up |
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Another issue may be the pedal is not returning enough to clear "port" to reservoir and allow fluid to release back in reservoir... Can be a issue with brakes also with improperly adjustment of free play in pedal/master cylinder adjustment...
Dale
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“Fear The Government That Wants To Take Your Guns" - Thomas Jefferson.
"Kellison Sand Piper Roadster" For Street & Show.
"Joe Pody Sandrover" Buggy with 2180 for Autocross (Sold)
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All suggestions and advice are purely my own opinion. You are free to ignore them if you wish ... |
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Dale M.
Samba Member
Joined: April 12, 2006
Posts: 20379
Location: Just a tiny bit west of Yosemite Valley
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| Posted: Mon Feb 20, 2017 11:02 am Post subject: Re: Hydraulic clutch locked up |
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| yitzac1990 wrote: |
| im curious, why are you playing with the clutch when the engine isnt even installed? the pressure plate is what returns the pedal back to its spot after you press the pedal down. since the engine isn't installed, there is no pressure plate, meaning there is nothing causing the fluid to go backwards, returning the pedal and everything back to its "non-pushed" state. |
Yes there is... Its the circular spring on throw-out arm shaft...
Dale
_________________
“Fear The Government That Wants To Take Your Guns" - Thomas Jefferson.
"Kellison Sand Piper Roadster" For Street & Show.
"Joe Pody Sandrover" Buggy with 2180 for Autocross (Sold)
============================================================
All suggestions and advice are purely my own opinion. You are free to ignore them if you wish ... |
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bonanzace
Samba Member
Joined: December 21, 2003
Posts: 55
Location: Denver,Colorado
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| Posted: Mon Feb 20, 2017 11:05 am Post subject: Re: Hydraulic clutch locked up |
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The engine was in. I pulled it because of the problem. Gary, That makes sense about the blind end. Master cylinder is a new old stock and the slave has been in the car for 30 years. I would have to do a lot of cutting on the body to fit any other master cylinder so I hope it is ok. I will pull the master out and take it apart to check it after I order a new slave and try it. Thanks for the information!
_________________
1957 Fiat 500 Subaru STI engine G50 trans
1967 Spatz dune buggy Subaru 2.5
1971 Ecotec powered panel
1927 Ave-T track roadster
Laxin like a zombie in the back of a kombi |
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Fenix
Samba Member
Joined: October 05, 2016
Posts: 468
Location: St Louis
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| Posted: Mon Feb 20, 2017 12:20 pm Post subject: Re: Hydraulic clutch locked up |
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| bonanzace wrote: |
| The engine was in. I pulled it because of the problem. Gary, That makes sense about the blind end. Master cylinder is a new old stock and the slave has been in the car for 30 years. I would have to do a lot of cutting on the body to fit any other master cylinder so I hope it is ok. I will pull the master out and take it apart to check it after I order a new slave and try it. Thanks for the information! |
Might see if there is a local shop that can rebuild them. My dad has sent several cylinders from his antique Cockshutt tractors and equipment off for rebuilding. Though purchasing a new one will probably be more cost effective, since there are replacements available. |
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pullstart
Samba Member
Joined: August 23, 2016
Posts: 599
Location: Middleville, MI
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| Posted: Mon Feb 20, 2017 2:11 pm Post subject: Re: Hydraulic clutch locked up |
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For some of the seals inside our small master cylinders, as for a drum brake wheel cylinder seal in the catalog, then match the right bore.
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4 seater Appletree buggy, road legal with 002 IRS, 3x3 Appletree kit, 6" over Dan's beam with 10" towers and Fox 2.0 shocks, '00 Subaru EJ25 with KEP stage 3 clutch and KEP adapter plate.
my build page: https://www.thesamba.com/vw/forum/viewtopic.php?t=662104&start=0 |
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yitzac1990
Samba Member
Joined: November 06, 2016
Posts: 75
Location: Huntsville, AL
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| Posted: Mon Feb 20, 2017 4:37 pm Post subject: Re: Hydraulic clutch locked up |
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| Dale M. wrote: |
| yitzac1990 wrote: |
| im curious, why are you playing with the clutch when the engine isnt even installed? the pressure plate is what returns the pedal back to its spot after you press the pedal down. since the engine isn't installed, there is no pressure plate, meaning there is nothing causing the fluid to go backwards, returning the pedal and everything back to its "non-pushed" state. |
Yes there is... Its the circular spring on throw-out arm shaft...
Dale |
oh, well apparently my trans is missing that spring hahaha |
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bonanzace
Samba Member
Joined: December 21, 2003
Posts: 55
Location: Denver,Colorado
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| Posted: Mon Feb 20, 2017 6:18 pm Post subject: Re: Hydraulic clutch locked up |
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| Dale M. wrote: |
Another issue may be the pedal is not returning enough to clear "port" to reservoir and allow fluid to release back in reservoir... Can be a issue with brakes also with improperly adjustment of free play in pedal/master cylinder adjustment...
Dale |
And the winner is.... DALE! 30 years of sitting on the shelf in Florida was not good on this master cylinder. Lots of corrosion inside keeping the one seal from retracting and clearing the return port. After cleaning the housing the bores are clean with no corrosion. new seals and flushing the lines again along with a new slave cylinder and I should be good. Thanks again everyone!!!
_________________
1957 Fiat 500 Subaru STI engine G50 trans
1967 Spatz dune buggy Subaru 2.5
1971 Ecotec powered panel
1927 Ave-T track roadster
Laxin like a zombie in the back of a kombi |
|
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pullstart
Samba Member
Joined: August 23, 2016
Posts: 599
Location: Middleville, MI
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| Posted: Mon Feb 20, 2017 6:34 pm Post subject: Re: Hydraulic clutch locked up |
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yum...
_________________
4 seater Appletree buggy, road legal with 002 IRS, 3x3 Appletree kit, 6" over Dan's beam with 10" towers and Fox 2.0 shocks, '00 Subaru EJ25 with KEP stage 3 clutch and KEP adapter plate.
my build page: https://www.thesamba.com/vw/forum/viewtopic.php?t=662104&start=0 |
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