Tracker Off-Road XTR1000 Service Manual page 45

CHECKING CAMSHAFT LOBES
CAUTION
If any camshaft lobe is discolored or pitted or if the
seating surface is worn, the camshaft must be replaced.
1. Measure the intake camshaft lobe heights (A):
34.350-34.450 mm (1.3523-1.3562 in.). <limit>:
33.650 mm (1.3248 in.).
2. Measure the intake base circle diameter (B):
24.950-25.050 mm (0.9823-0.9862 in.). <limit>:
24.850 mm (0.9783 in.).
3. Measure the exhaust camshaft lobe heights (A):
33.950-34.050 mm (1.3366-1.3405 in.). <limit>:
33.650 mm (1.3248 in.).
4. Measure the exhaust base circle diameter (B):
24.950-25.050 mm (0.9823-0.9862 in.). <limit>:
24.850 mm (0.9783 in.).
SNO-721
SNO-722
CHECKING CAMSHAFT RUNOUT
CAUTION
If any camshaft is discolored or pitted or if the seating
surface is worn, the camshaft must be replaced.
1. Measure the camshaft runout: 0.030 mm (0.0012 in.).
Replace if necessary.
44
SNO-723
CHECKING CAMSHAFT JOURNAL-TO-
CAMSHAFT CAP
Measure the camshaft journal-to-camshaft cap using the
following procedure (Clearance — 0.028-0.062 mm
(0.0011-0.0024-in.):
1. Install the camshaft into the cylinder head without
the dowel pins and the camshaft caps installed.
2. Position a strip of Plastigauge® (A) onto the cam-
shaft journal; then install the dowel pins and the
camshaft caps.
SNO-724
3. Tighten the camshaft caps cap screws in stages and
in a crisscross pattern working from the inner caps
outward. Tighten to 7.2 ft-lb (9.8 N-m, 1.0 kg-m).
NOTE: Do not turn the camshaft when measuring

the camshaft journal-to-camshaft cap clearance with
the Plastigauge®.
4. Remove the camshaft caps and measure the width of
the Plastigauge® (B).
SNO-725