C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Time for a new clutch

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Old Mar 4, 2014 | 12:27 PM
  #1  
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ricasso
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From: Cheltenham, England
Default Time for a new clutch

I have a 94 six speed coupe, the clutch has started to slip if I get a bit enthusiastic with the Go pedal, the thing is because Im in the UK and its my daily driver, I need to make sure the parts I order will be correct first time, I'll have to have them shipped from the US, and I cant afford to have it off the road any longer than necessary, therefore my question would be, exactly what parts will I need and are there any special considerations I need to know about, Ive looked at the kits on the Rock Auto site and there's mention of clutch's to suit dual mass flywheels and balance weights etc, how do I know what I need before I start?
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Old Mar 4, 2014 | 02:19 PM
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Black89Z51
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Since it's probably inevitable that your DMF is probably done for and that finding someone to resurface it over in the UK is probably slim and none, you are going to be needing a new flywheel.

I went with a SPEC stage 1 clutch. I really like it, no too heavy and holds the power.

On a street car, I would order the SPEC Stage 1 clutch, the steel flywheel with extra mass, and a rear main seal, and some new fluid for the transmission.

That should cover anything you need to do. There aren't any special tools needed other than the clutch alignment tool, which comes with the clutch kit.
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Old Mar 4, 2014 | 03:07 PM
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lt4obsesses
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Very interesting delimma. It is correct about the dual mass flywheel, and depending on how many miles are on the car it may be out of service. The way to check, unforunately is with the trans out and clutch disc removed. However, you may be able to check it for leaking by removing the inpsection cover on the bellhousing, there is also a small opening on the driver side where the clutch slave is located that with a swivel mirror and flashlight you may get a glimpse.

This is important because the real demise of the dual mass flywheel is not so much the movement of the two plates, 32 mm btw, but the condition of the seal that holds the grease pack in place. If this is corrupted, then it has to go. The only way to get a replacement dual mass is to find a used one, e-bay or what not.

If it is not gone, it should not be machined. However, it can be smoothed out with some maroon scothbrite. Then you can simply install the new disc and pressure plate.

Mine was toast, so I went with the Spec 22lb flywheel and a sprung hub Stage II clutch disc and PP. I have gear rattle, but it drives fine and accelerates much better.

Whatever you decide, when you order the clutch kit, make certain that they understand it is a '94 and a 'bluetag' transmission so that they send you the correct release bearing.

Once you get in there, be sure to check your pivot stud for grooving. If you see this, you may have problems with the clutch fork clearing the pressure plate. If so, contact Bill at ZFdoc.com, he may be able to help you locate one. They can be hard to find these days.
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Old Mar 4, 2014 | 03:54 PM
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ricasso
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Lots of good information there, many thanks, sorry I should have said it currently on 68,000 miles, I dont drive it "on the clutch", you know, slipping on take off, or to the point of spinning tires etc but I do like to get the power on nice and smoothly..
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