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got a friend with 1500 that keeps getting air in lines. we bled them clutch worked perfect for a day,we bled them, changed fluid, bled again. lasted aday. so, we bled them, clutch worked great. now, again, clutch starts to release with handle almost all the way out. when we bleed them, clutch will let out as soon as you release handle. after awhile, when you release clutch,handle travels almost all the way out before it engages.

what i'm saying is it keeps getting air in the line, and not loosing any fluid.

how is this possible? if it is sucking in air,wouldn't fluid come out there?

thank you,

mark:waving:



UPDATE: i talked to him this morning and he had tied clutch lever in as we do with brakes sometimes to let the air get back to the master cylinder. all is well, again

my questin is, if this happens again, what should we be looking at/ mc/ or slave cylinder?

thank you all for your help.



mark:waving:
 

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The Irish Crew
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If it happens again then I would say MC. Usually though it takes a lot of work to get all the air out because small pockets get trapped in awkward places.
 

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Use a vaccum bleeder. There are hand operated units usually locally available. Also, try bleeding at the banjo bolt near the master cylinder.
 

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did you try bleeding the master?
happened on mine and i took me two hours to find out the master kept air in there.
i did it with the vaccum bleeder and by hand,and still had air. when i bled the master it took me two minutes and my clutch was working great.
be sure when you do it to wrap a lot of towels around the master,cause if the oil sprays on your paint it will burn it
 

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Discussion Starter · #5 ·
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it only slipped once today on him. when all this 1st. happened, the master cylinder had a bunch of brown crud in it. cleaned it all out and changed all fluid.

thinking he may have gotten a piece of crud in line somehow, floating around in there, causing this.

may have to take m/c and clutch slave apart and blow out all lines to get this thing right.

thank you for all of the replys.

mark:waving:
 

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Check the small port in the master cylinder. The clutch master works the same way as the brake master cylinders, there are two holes between the reservoir and the cylinder bore in the master. The one the farthest away from the banjo end of the master is fairly large. There's a second hole toward the banjo end looks like a dead ended hole but it has a very small hole in the bottom of the larger one. I use a whisker from a wire brush held in a small vise grip to poke them out when they get plugged. If that small port does get plugged it becomes almost impossible to bleed the system. Without that port being open air can be sucked in behind the piston boot too.
 

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From your description it is not getting air in the system, it is not letting fluid return to the reservoir and the pressure in the line builds up causing the clutch to slip. When you bleed it you are releasing the excess pressure. If it had air in the system it would do the opposite, the clutch would drag. Like exavid wrote, clean out the small hole in the MC.
 

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got a friend with a monthly clutch fluid loss with no leaks...probably leaking from the master in the clutch area.
 

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Yea the slave cylinder can develope seapage,and sometimes draw in air, eventualy causeing enought air in the line to keep the clutch from completely disengageing. You'll feel a spongy effect near the end of the stroke(pullin in)on the clutch lever. As air compresses differently then fluid.
 

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Discussion Starter · #11 ·
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problem solved.........thank you paul and david..........put a tiny wire from wire brush down hole and walla.....looked like jed clamppet was shooting at some food and up through the ground came a bubbling crude:cheeky1:





mark:waving:



now when clutch handle in, releases, as soon as you let out, and no more slippage

my friend says thank you also...........mana to ya:clapper:
 

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I've got a similar problem on my 85 aspy. It started after I rebuilt the MC. I believe it's drawing air from the sealing washers on the Banjo Bolt.
 
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