1989 vette L98 external balance eng. w/6 speed ZF trans. installed new LUK (GM) dual mass flywheel w/ OEM replacement clutch/pressure plate assy. - eng. is out of balance. what is proper allignment for clutch assy. in relation to flywheel? old flywheel had 2 or 3 marks on it, new one has nothing distinctive to match with! clutch assy.has paint mark on it. should that line up with the crank dowl pin?

Sounds like air in the slave cylinder ! Bleed and see how that works out .

To honest- you know more, than we could even guess at

I would say the job you paid for wasn't done, as I would have done
it, six months ago

Repairs Shops don't always machine the flywheel & never balance
any of the assy & who knows the parts quality

Yes----- I once owned a trans shop, so I have seen some
not so good employees & managers at work & it isn't pretty,
sloppy work & lack of knowledge is my guess at your expense

Removal & Installation To Remove:

1. Remove the transmission.
2. Install a flywheel locking tool.
3. Remove the pressure plate mounting bolts from the flywheel.
4. Remove the pressure plate and clutch disc.

To Install:

1. Insert a clutch disc alignment tool through the disc splines and into the flywheel pilot bearing. Pressure plate balance mark location
   
   
2. Install the pressure plate on the flywheel with a gap of 120° or more between the "0" balance marks on the flywheel and pressure plate. Hand tighten the pressure plate mounting bolts.
3. Tighten the pressure plate mounting bolts using a crisscross pattern 12 ft-lb (16 Nm).
4. Remove the clutch disc alignment tool.
5. Install the transmission.

I would go with an aftermarket performance clutch and pressure plate,as well as balance the flywheel,then bolt on the clutch assy and balance it all. Also,unrelated I balance all my drive shafts.

One problem pops into head when I think about your description of the problem. The bolts that hold the pressure plate to the flywheel may be too long, causing the engine block to interfere with the rotation of the flywheel.

the syncro inside the trans is going bad. go to a trans shop or install a low mileage used trans. best of luck

You will need the Chev pressure plate to suit the Chev flywheel and a clutch plate to suit the Ford ZF gearbox. Ford ZF throwout bearing and clutch fork should be fine.

There is a company in Northern Ireland called Exact Engineering that can convert your dual mass flywheel to single mass using a complex engineering process ending with a finely balanced guaranteed single mass product. They have a complete courir service.

You can see their website at www.exact-spec.com and contact them at [email protected]

Manual transmissions do not slip ie. when the gears mesh, there is no slip unless they strip out and make an awful noise and will not pull henceforth.

You probably still have a slipping clutch plate against the flywheel. You need to adjust the clutch petal linkage shaft to allow the pressure plate to be release from the thrust bearing, ie shorten the shaft length.. If you and most likely you do just have the clutch release slave cylinder that releases the clutch when you apply the petal. You need to bleed the slave cylinder of any excess fluid or air that may have entered the line if you opened it at any point. You need to bleed it as you would a break cylinder and this should fix ya.
good luck.
good luck

Possibility, you may have intalled the clutch disk backwards.... if so, the disk hub is torqued against the crankshaft hub preventing engagement of the clutch. 2003 TIBUORN DUAL MASS FLYWHEEL AND CLUTCH DISC ASSEMBLY INSTALLATION PROCEDURE DESCRIPTION: The 2003 MY 2.7L Tiburon vehicle equipped with the 6-speed manual transaxle employs a dual mass flywheel system. The 2003 Tiburon Shop Manual does not show the clutch disc assembly with the dual mass flywheel. This bulletin provides information about how to assemble these components. NOTE Although it is possible to assemble the clutch disc with either side facing the flywheel surface, only the assembly of these two parts shown in this bulletin is correct.
PARTS ASSEMBLY:

1. Attach the dual mass flywheel to the engine crankshaft assembly.
2. Identify the clutch disc flange side and the collar side as shown.
3. Install the collar side of the clutch disc on the dual mass flywheel surface so that the flange side is facing the pressure plate side as shown.
4. Attach the pressure plate to the dual mass flywheel and complete assembly of the remaining components per the Shop Manual procedures.