Mantic: Installation Instructions For Mantic Clutch Kits – Racing Applications Part 1

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Driveline Alignment

Before fitting your Mantic Clutch Kit it is important to check the vehicle for driveline alignment. Poor alignment will cause premature failure of your clutch. The standard-size clutch with sprung clutch discs can handle the typical alignment of a production vehicle, however smaller and more particularly solid centre clutch discs require more accurate alignment to obtain the maximum life and performance expected from this style of clutch kit. Therefore it is critical that the alignment of the driveline be checked prior to the fitment of your Mantic Clutch Kit.

The bell housing must be checked for concentricity and parallelism. This can be done using a dial indicator mounted on the crankshaft. The maximum run-out allowable is 0.15mm (0.0059”) T.I.R (Total Indicator Reading) and the maximum out of parallelism is 0.15mm (0.0059”) T.I.R.

If misalignment is present you will need to find the cause.

• Inspect all dowels and dowel holes for condition.
• Clean all mating surfaces.
• Inspect block flange for damage.
• Inspect the block flange for out of parallelism.

REMEMBER – IF MISALIGNMENT IS PRESENT, FITTING A NEW CLUTCH KIT WILL NOT FIX THE CAUSE OF THE PROBLEM AND THE MISALIGNMENT WILL QUICKLY DESTROY THE NEW CLUTCH.

Considerations for fitting a non-specific Mantic Track Series clutch

Note: Mantic non specific kits are supplied without bolts due to the varying threads that may already be in use on existing flywheels, and the differing lengths required. Any bolts used must be a minimum Grade #8 tensile strength and tightened to 33Nm. Clutches are designed to be mounted with M8 X 1.25 (5/16 UNF) bolts (8 x 9000 kits, 6 x 5000, 6 x 7000 kits). Under no circumstances should the locating holes in the cover or drive blocks be enlarged. All kits are supplied with special washers for use under the bolts.

IMPORTANT:

Input shaft length: A major consideration in establishing the possible changes required to install the clutch is that the transmission being used has a spline that is long enough, and in a suitable position, to match up with the clutch disc splines. It is very frustrating to get to the stage of actually fitting the gearbox to find that the input shaft spline length is incorrect, or that the spline is in the wrong place to match the clutch discs.

Dimensions for 9000 twin disc (assembled): Front disc spline to crankshaft = 19mm Disc to disc (OD) spline length = 34mm

Therefore: the input shaft must have a spline that is at least 34mm in working area that is 19mm from the crank. (This assumes no lip on the crank, and does not allow for spigot bearing requirements.) If the input shaft does not meet these dimensions, then the fitter will need to either change transmissions or have new hubs made with the appropriate offsets required. (Not available from Mantic)

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