Can you test the clutch slave cylinder? - BMW Luxury Touring Community
 
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post #1 of 8 Old Feb 8th, 2015, 7:22 pm Thread Starter
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Can you test the clutch slave cylinder?

I just drilled the weep hole since I had to replace a leaking clutch line anyway. Rotted out just under the rubber at the banjo bolt by the way. I had a little oil inside the cylinder but cleaned it all up before I checked to see what kind it was. I believe it was transmission since the bottom of the seal was a little wet. Can I test the slave to see if it will leak? I have a 2005 with 32k. Also is there a more resistant seal to synthetic I can purchase?
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post #2 of 8 Old Feb 8th, 2015, 7:32 pm
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Re: Can you test the clutch slave cylinder?

If there was gear oil n the recess then you need to replace the rear input shaft seal (PN 23 12 7 705 085) 17x28x7. Gear oil will destroy the slave seal. You can check the slave by using the release rod to push the piston back. Look in the bore for evidence of leaking or oil contamination.

John
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post #3 of 8 Old Feb 8th, 2015, 8:09 pm Thread Starter
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Re: Can you test the clutch slave cylinder?

John, I thought you had a post out there with information about a better seal. I did that with the shaft and didn't see any leaks. Took it apart and everything seems to be ok. I wasn't sure that just by operating it this way would give certain proof.
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post #4 of 8 Old Feb 8th, 2015, 9:04 pm
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Re: Can you test the clutch slave cylinder?

The better seal was for the out put shaft where the drive shaft goes. When you push the piston back in the slave, the bore should be dry - if not you may have a leak.

John
2009 K1300GT Red Rocket
2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 110 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable
K4AN

Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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post #5 of 8 Old Feb 9th, 2015, 8:05 am
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Re: Can you test the clutch slave cylinder?

If you have over 30,000 miles on the slave, WISE move would be to replace it while you have it apart! Not worth re using one with much mileage on it, you would just be liable for a failure sooner than you would expect.

Also, as John said, check it for dry bore with the piston pushed back, and even more importantly check that the little bearing in the end of the slave piston is spinning freely. That bearing tightening or freezing is likely the failure mode of many, if not most. If the piston spins in the cylinder due to a tight bearing, it is all over!

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post #6 of 8 Old Feb 9th, 2015, 4:49 pm Thread Starter
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Re: Can you test the clutch slave cylinder?

I believe the slave is alright but I think I will take your advice and change it. Now if I can only find somebody to make me up a clutch line.
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post #7 of 8 Old Feb 9th, 2015, 7:12 pm
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Re: Can you test the clutch slave cylinder?

Bite the bullet, buy the stock line and ride on. The original lasted this long.

Robert

They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety.
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post #8 of 8 Old Feb 10th, 2015, 5:32 pm Thread Starter
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Re: Can you test the clutch slave cylinder?

[QUOTE=Scouter-50;1219257]Bite the bullet, buy the stock line and ride on. The original lasted this long.

Robert[/QUOTE Have you read my other thread "Can't find an aftermarket clutch hose". I don't think so. I don't mind getting hosed but not double hosed
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