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3.9 Maintenance 3 Rev. 1 07/2006 ENGINE MAINTENANCE FST Air Filter FST models feature an air filter element to protect the NOTE: Do not clean the air filter cartridge. Alternator Belt Inspection / Adjustment The alternator belt deflection must be maintained to ensure 1. Inspect the alternator belt deflection by rotating the belt as 2. Adjust the belt deflection by loosening the upper and lower 3. Insert a large pry bar between the crankcase and alternator 4. Twist the belt while pulling back on the pry bar. 5. Have an assistant tighten the two alternator fasteners once Valve Lash Adjustment 1. Open the hood and remove the left-side door panel. 2. Remove the key from the ignition switch. 3. Remove the airbox / clutch guard from the engine 4. Remove the console assembly. 5. Remove the seat assembly to gain access to the fuel tank. 6. Remove the fasteners securing the fuel tank to the tunnel. 7. Cover the supply and return fuel hose connectors with a 8. Disconnect the fuel pump wiring harness. 9. Remove the fuel tank from the snowmobile. 10. Remove the wiring harness connectors from the ignition coils and cam phase sensor. Verify each connector is 11. Remove the air intake tube (FST models) that is routed over the top of the valve cover. 12. Remove the ignition coils, then remove the valve cover. 13. Rotate the drive clutch in the direction of forward vehicle operation until the rocker arms on the PTO-side of the 14. Insert a feeler gauge between the valve shim and rocker arm tappet at each valve location. Write-down each 15. Compare each measurement to the specification. 16. If the valve shim clearance is within specification, no change is required. If the clearance is outside the Valve Clearance E NGINE / V ALVES S PECIFICATION NA .08 -.15mm (.003 ″ -.006″) .15 -.22mm (.006 ″ -.008″) Turbo .08 -.15mm (.003 ″ -.006″) .18 -.25mm (.007 ″ -.009″) |