Clutch Slave Failure
12-05-2006, 09:45 AM
#1
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Clutch Slave Failure
Problem: After a spirited boosted drive, loss of ability to disengage clutch.
Symptoms: Very "soft" clutch pedal, inactive clutch hydraulics, loss of clutch fluid
Solution: Replace clutch slave cylinder, fill system with brake fluid and bleed. Tools required: 8, 10, 12 mm wrenches, rags. Time required: 45 minutes. Difficulty (1-10) 3. Note: Rinse brake fluid off of any surface it contacts with a liberal amount of water.
Cost: $30 for new slave, $5 for a can of brake fluid.
Symptoms: Very "soft" clutch pedal, inactive clutch hydraulics, loss of clutch fluid
Solution: Replace clutch slave cylinder, fill system with brake fluid and bleed. Tools required: 8, 10, 12 mm wrenches, rags. Time required: 45 minutes. Difficulty (1-10) 3. Note: Rinse brake fluid off of any surface it contacts with a liberal amount of water.
Cost: $30 for new slave, $5 for a can of brake fluid.
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12-05-2006, 11:39 AM
#4
ben- where'd you get the slave? Weird thing is I called two parts stores and they both wanted the cast number on the existing slave to spec the new part. Apparently there's a running change in slaves on the 90. Wonder what it is. I was going to use a B2xxx slave for better fitment, but when I went to hook it up, it's got a different compression fitting on it than the original slave/line- wonder if that's it?
Last edited by m2cupcar; 12-05-2006 at 12:03 PM.
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12-05-2006, 12:14 PM
#5
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Slave came from Main Auto in Lawrenceville. They required no information beyond make and model. I asked for it Friday at 5 pm and they had it Saturday morning. Good people.
I have an account there (wholesale), so I can order you one if you need...
I have an account there (wholesale), so I can order you one if you need...
ben- where'd you get the slave? Weird thing is I called two parts stores and they both wanted the cast number on the existing slave to spec the new part. Apparently there's a running change in slaves on the 90. Wonder what it is. I was going to use a B2xxx slave for better fitment, but when I went to hook it up, it's got a different compression fitting on it than the original slave/line- wonder if that's it?
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12-08-2006, 02:21 PM
#8
Didn't mean to make my first post on this forum here, but this thread caught my eye.
I have a `90 that required a clutch release cylinder replacement a month or so ago. Ordered a Seiken aftermarket cylinder, did not fit properly (hydraulic line's flare nut threaded down to the hex sides of the nut and still leaked). Upon removal, I noticed the bore for the flare nut is deeper than the factory unit, probably by >1/8" AND the flare machined into this bore would not mate properly with the hydraulic line.
Regarding the difference in cylinders for the `90, the difference lies in the kind of flare present in the flare nut bore. My original (VIN 111591) was a CONVEX flare; my replacement Seiken unit was a CONCAVE flare.
From Moss Motors (Miata.net sponsor), part numbers for the `90 cylinders are as follows:
CONCAVE flare: 903-150
CONVEX flare: 903-155
Hope this helps...oh, and I think I'll enjoy frequenting this forum.
I have a `90 that required a clutch release cylinder replacement a month or so ago. Ordered a Seiken aftermarket cylinder, did not fit properly (hydraulic line's flare nut threaded down to the hex sides of the nut and still leaked). Upon removal, I noticed the bore for the flare nut is deeper than the factory unit, probably by >1/8" AND the flare machined into this bore would not mate properly with the hydraulic line.
Regarding the difference in cylinders for the `90, the difference lies in the kind of flare present in the flare nut bore. My original (VIN 111591) was a CONVEX flare; my replacement Seiken unit was a CONCAVE flare.
From Moss Motors (Miata.net sponsor), part numbers for the `90 cylinders are as follows:
CONCAVE flare: 903-150
CONVEX flare: 903-155
Hope this helps...oh, and I think I'll enjoy frequenting this forum.
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12-08-2006, 02:45 PM
#10
Didn't mean to make my first post on this forum here, but this thread caught my eye.
I have a `90 that required a clutch release cylinder replacement a month or so ago. Ordered a Seiken aftermarket cylinder, did not fit properly (hydraulic line's flare nut threaded down to the hex sides of the nut and still leaked). Upon removal, I noticed the bore for the flare nut is deeper than the factory unit, probably by >1/8" AND the flare machined into this bore would not mate properly with the hydraulic line.
Regarding the difference in cylinders for the `90, the difference lies in the kind of flare present in the flare nut bore. My original (VIN 111591) was a CONVEX flare; my replacement Seiken unit was a CONCAVE flare.
From Moss Motors (Miata.net sponsor), part numbers for the `90 cylinders are as follows:
CONCAVE flare: 903-150
CONVEX flare: 903-155
Hope this helps...oh, and I think I'll enjoy frequenting this forum.
I have a `90 that required a clutch release cylinder replacement a month or so ago. Ordered a Seiken aftermarket cylinder, did not fit properly (hydraulic line's flare nut threaded down to the hex sides of the nut and still leaked). Upon removal, I noticed the bore for the flare nut is deeper than the factory unit, probably by >1/8" AND the flare machined into this bore would not mate properly with the hydraulic line.
Regarding the difference in cylinders for the `90, the difference lies in the kind of flare present in the flare nut bore. My original (VIN 111591) was a CONVEX flare; my replacement Seiken unit was a CONCAVE flare.
From Moss Motors (Miata.net sponsor), part numbers for the `90 cylinders are as follows:
CONCAVE flare: 903-150
CONVEX flare: 903-155
Hope this helps...oh, and I think I'll enjoy frequenting this forum.
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