Arctic Cat 660 cc Service Manual page 63

NOTE: The sprocket on the end of the crankshaft
also serves as the oil pump drive.
27. Rotate the crankshaft until the keyway faces
straight up with the No. 1 piston at top dead center
(TDC) and aligns with the mark on the crankcase.
28. Verify that the camshafts being installed are
marked correctly: intake camshaft marked U;
exhaust camshaft marked V.
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29. Set the intake and exhaust camshafts in place in
the cylinder head. Place a small piece of
plastigauge over each journal of the camshafts;
then install the dowel pins, camshaft caps, and cap
screws. Tighten the cap screws to 1.1 kg-m (8 ft-
lb).
NOTE: The large camshaft cap mounts are posi-
tioned at the camshaft sprocket end of the cylinder
head. All other camshaft caps have identification
numbers designating intake-side (I-1, I-2, and I-3)
or exhaust-side (E-1, E-2, and E-3). The I-1 and E-1
caps mount nearest to the large one-piece cap on
the sprocket end; then I-2 and E-2 with I-3 and E-3
mounting at the far end. Arrows on each cap need
to face toward the sprocket end of the camshaft.
NOTE: Make sure the intake camshaft and
exhaust camshaft are on the correct sides of the
cylinder head.
30. Remove the camshaft cap retaining cap screws;
then carefully remove the camshaft caps.
31. Using the scale supplied with the plastigauge,
verify that the oil clearance for each journal is
0.045-0.087 mm (0.0018-0.0034 in.). Remove the
plastigauge; then clean the journals and caps.
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