Clutch problem after installing upgraded CSC
 

i had jus installed my new upgrade CSC from Zspeed about a month ago a long with thea new MSC. At first I was losing clutch fluid due to the bleeder leaking, but once I tighten it pretty hard that problem was solved. But after re bleeding I had this other problem and started hearing a grinding sound every time I would down shift. for example I would be at a red light, and as soon as I am about to shift I will hear grinding sound. when installing the CSC I didn't upgrade the clutch or flywheel and that cars has 63k.

Me thinks the CSC is not fully disengaging when shifting. Perhaps the new CSC is larger and require more fluid volume to extend far enough to fully disengage. Mayhaps id you give the MC rod a few twist to make it longer, that will push more fluid into the CSC when the clutch pedal is depressed.

YzGyz

Call Joe asap.

Edit: Joe@Zspeed

imma do that first thing in the morning

Our CSC is the same size as the stock unit, No adjustment is required.

Just turning the master cylinder adjustment rod a few turns is a bad idea, there is more to it than that. You must adjust the pedal height anytime master cylinder rod is adjusted for more stroke or you could cause major issues with the clutch system.

Thanks for calling, Here is a link to the video I was referring to about the pilot bushing being a possibility for your noise. It is the first post on our facebook page.
https://www.facebook.com/ZSpeedPerformance/?pnref=lhc

Sometimes the lowly pilot bearing is forgotten. In our case it is only a bronze bushing and once it dries what little lube that it has or wears to some degree it creates friction on the input shaft which will causes grinding when shifting gears at a stand still. Hopefully you added a little lube when changing the csc or better yet replaced this $2 part.

Definitely would check the pilot bearing, recently had a shop do this same sort of work and used a pilot bushing from competition clutch...long story short, the pilot bushing from competition clutch was a piece of crap and started grinding after just a couple thousand miles leading to me having to take it back in and have the shop install an oem pilotbushing from nissan....havent had one issue since then. Also make sure to bleed the zspeed csc properly as it can lead to you losing clutch pressure if you press on the clutch pedal for any amount of time from air being in the system.

To the OP, the bleeder does not need to be gorilla torqued. I don't have the factory spec at the top of my head, but like brake bleeders, ~5-6 ft lb is plenty. To me, snug with a small wrench (10mm on the sport brakes, i think 8mm on the clutch). If it's leaking it could be the tip is damaged or the seat (in the slave), thus requiring it to be tightened more.

To expand on what joe said in post #5, the height is adjusted with the cruise/starter limited switches. If left unadjusted, the switch (esp the top/cruise) can potentially apply slight pressure to the pedal, resulting in a partially engaged clutch.

Same for the lower switch (starter). Improper adjustment will prevent the clutch from fully disengaging.