Polaris 1999 Sportsman 400 Service Manual page 111

ENGINE TOI' END 105
47
®
I. Thoroughly clean the cams haft in solvent. thcn
thoroughly dry. Apply engine oil to all bearing sur-
faces.
2. Check the camshaft lobes (A. Figure 44) for
wear. The lobes should not be scored and the edges
should be square.
3. Measure the height of each lobe (Figure 45)
with
a micrometer.
4. Check each camshaft bearing jou rnal (B, Figure
44) for wear and scoring.
5. Measure eac h camshaft bearing jo urnal (Figure
46) with a micrometer.
6. If the bearing journals are severely worn or dam-
aged, check the bearing journals in the cylinder
head. They should not be scored or excessively
worn. If any of the bearing surfaces arc worn or
scored , replace the cy linder head.
7. Make sure the camshaft o il holes are open and
clear (F igure 47), clean them out if necessary,
8. Measure the camshaft bearing bore innerdiameter
(Fig ure 48) in the cylinder head with a bore gauge.
9. Calculate thc camshaft-to-cylinder head bore
clearance as follows: