Motor Frontier

ENGINE MECHANICAL SECTION

GI MA

EM

LC EC

CONTENTS
KA24DE PRECAUTIONS ...............................................................4 Supplemental Restraint System (SRS) ″AIR BAG″ and ″SEAT BELT PRE-TENSIONER″...............4 Parts Requiring Angular Tightening.............................5 Liquid Gasket Application Procedure ..........................5 PREPARATION...............................................................6 Special Service Tools ..................................................6 Commercial Service Tools ...........................................8 NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING ...................................................10 NVH Troubleshooting Chart - Engine Noise .............11 OUTER COMPONENT PARTS.....................................12 Removal and Installation ...........................................12 MEASUREMENT OF COMPRESSION PRESSURE ....15 OIL PAN.........................................................................16 Components...............................................................16 Removal.....................................................................16Installation..................................................................17 TIMING CHAIN ..............................................................18 Components...............................................................18 LIQUID GASKET APPLICATION PLACES..................19 Removal.....................................................................20 UPPER TIMING CHAIN ............................................20IDLER SPROCKET ..................................................21 LOWER TIMING CHAIN ...........................................21 Inspection...................................................................22 Installation..................................................................23 LOWER TIMING CHAIN ...........................................23 IDLER SPROCKET..................................................24 UPPER TIMING CHAIN ............................................24 OIL SEAL.......................................................................26 Replacement..............................................................26 VALVE OIL SEAL .....................................................26 OIL SEAL INSTALLING DIRECTION .........................26 FRONT OIL SEAL....................................................26 REAR OIL SEAL ......................................................27 CYLINDER HEAD..........................................................29 Components...............................................................29 Removal.....................................................................30Installation..................................................................31 Disassembly...............................................................31 Inspection...................................................................31 CYLINDER HEAD DISTORTION ...............................31 CAMSHAFT VISUAL CHECK ....................................32 CAMSHAFT RUNOUT ..............................................32 CAMSHAFT CAM HEIGHT.......................................32 CAMSHAFT JOURNAL CLEARANCE ........................32 CAMSHAFT END PLAY............................................33 CAMSHAFT SPROCKET RUNOUT ...........................33 VALVE GUIDE CLEARANCE ....................................33 VALVE GUIDE REPLACEMENT ................................34 VALVE SEATS .........................................................35REPLACING VALVE SEAT FOR SERVICE PARTS ....35 VALVE DIMENSIONS ...............................................36 VALVE SPRING .......................................................37 VALVE LIFTER AND VALVE SHIM ............................37 Assembly ...................................................................38 Valve Clearance.........................................................38...