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Flywheel
Engine
Clutch Flyweights
Clutch Nut
Clutch Disk
Clutch Shoe
Clutch Spring
Clutch Preload Collar
Clutch Spring Cup
Inner Ball-bearing (5x10x4)
XCA Pinion Gear (2nd)
XCA Pinion
Gear (1st)
Outer Ball-bearing (5x8x2.5)
Thrustbearing
Assembly
Thrustbearing
Collar
XCA CLUTCH
The XCA (XRAY Centrifugal-Axial) Clutch must be properly set up before driving the car the fi rst time. A properly set up clutch will have a dramatic
impact on the performance and drivability of the NT1.
It is important to note that there are many factors that may affect engine and clutch performance. Factors such as proper engine tuning, proper clutch
assembly, clutch gap, and clutch endplay can all affect clutch performance.
There are three settings on the XCA clutch: clutch spring preload, clutch gap, and clutchbell endplay. Each of these settings is adjusted independently
of the others.
• Clutch spring preload is adjusted using the clutch preload collar.
• Clutch gap and clutchbell endplay are adjusted using different shims.
BUILDING AND MAINTAINING THE XCA CLUTCH
When building the XCA clutch, it is very important to shim it properly for proper operation and long life. An improperly-built clutch may cause
excessive slip, too early or too late engagement, engine bogging, and premature clutch failure.
GREASING AND OILING
The thrustbearing in the XCA clutch should be re-greased at least once every 30 minutes, or more often if you run on dirty tracks or your car goes
off the track often. We recommend using a thick, high-tack grease such as graphite grease. The ball-bearings in the XCA clutch should be oiled
regularly with a good, light bearing oil. The ball-bearings are subjected to high heat for extended periods, and have a tendency to get “rusty” after
a short time (which may lead to failure if not oiled).
THRUSTBEARING INSTALLATION
The thrustbearing has two plates — one with a larger dimensions, and one with a
smaller dimensions. The plate with larger dimensions MUST go towards the fl ywheel.
ø10mm
ø5.2mm
INNER PLATE
OUTER PLATE
ø9.8mm
ø5.0mm
XCA CLUTCH
Shim for fl ywheel spacing
Clutchbell
Shim for endplay adjustment
Shim for clutch gap adjustment
IMPORTANT WARNING:
It is extremely important to set the proper clutch gap and endplay, or you
risk premature thrustbearing and engine failure.
Summary of Contents for NT1
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