Slave cylinder day. - ZR-1 Net Registry Forums

rhipsher · 01-31-2009

Well I have less than 8,000 miles on my slave cylinder after installing a new clutch a year ago and today it bought the farm. I guess it could have been the valve being installed backward like I have read about on here that causes them to prematurely fail. I have noticed that in that time that clutch fluid had been leaking out. And I have had to refill the reservour 3 or four times. Time to get dirty again and feel my skin burn from that clutch fluid. Wahoo!

jonszr1 · 01-31-2009

bummer ,hope you get one done right this time . how can one ck the slave before putting it in to see if its right

rhipsher · 01-31-2009

I guess you have to pull it apart and compare it to the picture on this forum. But if you don't take it apart correctly you can destroy it. They are about $85.00 so I'll take my chances and just install the new one. If I only get 8,000 miles out of it because of bad bendix assy job then so be it. It only takes an hour to install it. The only bad part about it is if it goes cocka on you, you'd better hope your not far from home and that there are not to many lights you have to stop at.

lbszr · 02-01-2009

Quote:

Originally Posted by rhipsher

I guess you have to pull it apart and compare it to the picture on this forum. But if you don't take it apart correctly you can destroy it. They are about $85.00 so I'll take my chances and just install the new one. If I only get 8,000 miles out of it because of bad bendix assy job then so be it. It only takes an hour to install it. The only bad part about it is if it goes cocka on you, you'd better hope your not far from home and that there are not to many lights you have to stop at.

First one I bought had the seal installed right, but 1/3 of the seal was ripped off from installation. They come apart easy, used a dull tiny screwdriver to work the lip of the seal in with constant pressure pushing on pistion, but not much pushing and when it's ready it pops together without forcing. Cleaned up the chamfered edges of the cyl. first, they were kinda rough.

You could practice on your defective one first.

tomtom72 · 02-01-2009

Man I remember the bad ones. Go to zfdoc.com and/or our zr1netreg site to get the skinny. The seal on backwards was not the only defect on the DOM type slaves cylinders.

seal on backwards.
bad welds @ the line bungs.
various porosity issues with the metal.
Bore run out.
lousey machining of the ends of the springs. The spring end is machined flat and they never chamfered the ground ends, so they broke off after a few cycles.
General metal fragments left behind, Bill felt they came from the tapping of the bungs.

Back in late 05 & early 06 I went thru six sets of masters & slaves before I got one slave to work. Some of the masters had badly formed reserviors, porosity, weld, & metal shavings issues also. I was doing my r&r at the height of the "spillage" issues, so it was a real crap shoot on the parts. I finally had to assemble a slave from parts scavanged from other new deffective slaves and a cast type cylinder. Quality control.

I would suggest if you continue to have trouble to call Bill at zfdoc. For me, that was the most expensive "cheap" thing that I did to my Z.

Tom

QB93Z · 02-01-2009

Is there a sure way to get a good slave cylinder today? I replaced mine in December and it is leaking worse that before already.

Is there a best brand?

Is DOM (drawn over mandrel, I believe) more or less likely to leak than cast?

Is there a GM version that works correctly?

What is the story today?

Jim

01-31-2009	#1
rhipsher Join Date: Aug 2008 Location: Houston, TX Posts: 2,314	Slave cylinder day. Well I have less than 8,000 miles on my slave cylinder after installing a new clutch a year ago and today it bought the farm. I guess it could have been the valve being installed backward like I have read about on here that causes them to prematurely fail. I have noticed that in that time that clutch fluid had been leaking out. And I have had to refill the reservour 3 or four times. Time to get dirty again and feel my skin burn from that clutch fluid. Wahoo!

01-31-2009	#2
jonszr1 Join Date: Sep 2006 Location: lone pine and mammoth lakes Posts: 1,406	Re: Slave cylinder day. bummer ,hope you get one done right this time . how can one ck the slave before putting it in to see if its right

01-31-2009	#3
rhipsher Join Date: Aug 2008 Location: Houston, TX Posts: 2,314	Re: Slave cylinder day. I guess you have to pull it apart and compare it to the picture on this forum. But if you don't take it apart correctly you can destroy it. They are about $85.00 so I'll take my chances and just install the new one. If I only get 8,000 miles out of it because of bad bendix assy job then so be it. It only takes an hour to install it. The only bad part about it is if it goes cocka on you, you'd better hope your not far from home and that there are not to many lights you have to stop at.

02-01-2009	#5
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,609	Re: Slave cylinder day. Man I remember the bad ones. Go to zfdoc.com and/or our zr1netreg site to get the skinny. The seal on backwards was not the only defect on the DOM type slaves cylinders. seal on backwards. bad welds @ the line bungs. various porosity issues with the metal. Bore run out. lousey machining of the ends of the springs. The spring end is machined flat and they never chamfered the ground ends, so they broke off after a few cycles. General metal fragments left behind, Bill felt they came from the tapping of the bungs. Back in late 05 & early 06 I went thru six sets of masters & slaves before I got one slave to work. Some of the masters had badly formed reserviors, porosity, weld, & metal shavings issues also. I was doing my r&r at the height of the "spillage" issues, so it was a real crap shoot on the parts. I finally had to assemble a slave from parts scavanged from other new deffective slaves and a cast type cylinder. Quality control. I would suggest if you continue to have trouble to call Bill at zfdoc. For me, that was the most expensive "cheap" thing that I did to my Z. Tom __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member

02-01-2009	#6
QB93Z Join Date: May 2007 Location: Westminster, Maryland Posts: 3,684	Re: Slave cylinder day. Is there a sure way to get a good slave cylinder today? I replaced mine in December and it is leaking worse that before already. Is there a best brand? Is DOM (drawn over mandrel, I believe) more or less likely to leak than cast? Is there a GM version that works correctly? What is the story today? Jim