2004 Bombardier Outlander 330/400 Factory Service Manual, Page 63Get this manual
Section 03 ENGINE Subsection 02 (TROUBLESHOOTING)
CYLINDER AND HEAD
SYMPTOM CONDITION TestInspection UNUSUAL ENGINE NOISE ANDOR VIBRATION IN IDLE SPEEDNORMAL USE1Check operation of decompressor located on camshaftaDecompressor shaft stucks andor torsion spring is damagedReplace spring andor decompressor mechanismbLoose camshaft gearRetighten camshaft gear (refer to CYLINDER AND HEAD)2Check chain tensioner operationaFaulty chain tensionerReplace spring andor mechanism3Check valve adjustmentaIntake andor exhaust valves not adjusted correctlyAdjust valvesSYMPTOM CONDITION TestInspection UNUSUAL ENGINE NOISE ANDOR VIBRATION WHILE OPERATINGNORMAL USE1Check items and of UNUSUAL ENGINE NOISE ANDOR VIBRATION IN IDLE SPEED2Check noise coming from cylinder head areaaCheck valve clearanceReadjust valve clearance andor replace defective part(s)bChain guide worn outReplace chain guidecStretched chain andor worn out sprocketReplace chain and sprocket at the same timedSprocket screw got looseRetighten screw with recommended torqueeRocker arm(s) is (are) worn out (valve adjustment)Readjust valve clearance andor replace rocker arm(s)fThrust washer(s) on rocker arm shaft is (are) missingFit thrust washer(s) (refer to CYLINDER AND HEAD)SYMPTOM CONDITION TestInspection OIL CONTAMINATION ON CYLINDER ANDOR HEADNORMAL USE1Check screws for torqueaLoose screwsRetighten screws with recommended torquebGaskets are brittle, hard, worn out or damagedReplace damaged gasket(s)