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FLYWHEEL SHIMMING
When installing the XCA Clutch on the engine crankshaft, the fl ywheel must be properly
shimmed outward from the engine so the crankshaft protrudes the proper amount. This
will affect other adjustments such as clutch spring preload, clutch gap, and clutchbell
endplay.
ADJUSTING FLYWHEEL DISTANCE
Flywheel – Initial Setting: crankshaft extends +9.0mm beyond clutch nut
Place large diameter shims behind the fl ywheel cone so that the crankshaft extends
9.0mm beyond the end of the clutch nut.
CLUTCH SPRING PRELOAD
Clutch spring preload affects the point at which the clutch engages, and is altered by
tightening or loosening the clutch spring preload collar.
EFFECTS OF CLUTCH SPRING PRELOAD
Lighter Preload
(looser collar)
• Earlier engagement
• Better on slippery tracks
Heavier Preload
(tighter collar)
• Later engagement
• Better on smooth, high-traction tracks
ADJUSTING CLUTCH SPRING PRELOAD
Clutch Spring Preload – Initial Setting: 10 ~ 11 mm from end of crankshaft
Set the clutch spring preload collar to an initial value of 10 ~ 11 mm from the end of the crankshaft to the outer edge of the collar.
This is an initial value ONLY and must be adjusted at the track.
Adjust clutch spring preload by loosening or tightening the clutch spring preload collar.
Shim (for adjusting fl ywheel distance)
10~11mm
Adjust with spring
preload collar
9.2 ~9.3mm
Adjust with shims
behind fl ywheel
XCA CLUTCH
Preload Adjustment without
Disassembly (at the track)
After initial adjustment during the building phase,
you can easily adjust the clutch spring preload at the
track without disassembling the car or clutch.
1. Ensure the engine is stopped.
2. Find the small hole in the clutchbell near the
2nd gear pinion.
3. Rotate the fl ywheel until you see the slotted
preload collar through the clutchbell hole.
4. Insert a small hex wrench through the hole, and
push into the slot of the preload collar inside.
5. Holding the hex wrench securely so the preload
collar does not move, rotate the fl ywheel to
tighten or loosen the preload collar.
Lighter Preload (looser collar) Rotate fl ywheel CW
Heavier Preload (tighter collar) Rotate fl ywheel CCW
LIGHTER
preload
HEAVIER
preload
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