Jeep Engines - Oljeep

ivMOPAR PERFORMANCE PARTSEngine Assembly2.46L ENGINE GENERALSPECIFICATIONS ....................... 12 12.46L ENGINE GENERAL TORQUESPECIFICATIONS ....................... 124Chapter 4: 4.0L Power Tech In-line 6Introduction .............................. 129BlockINTRODUCTION ....................... 130Build Date Code ..................... 130Oversize and UndersizeComponent Codes .................... 131Block Harness ....................... 131Rough Bored Blocks .................. 131CYLINDER BLOCK PREPARATION ....... 131Block-to-Head Distortion ............... 131Stress Relieving ...................... 132Sonic Testing ........................ 132Core Shift .......................... 132Surfacing (“Decking”) ................. 133Honing ............................. 133Boring and Milling Specifications ........ 134Cylinder Bore Measurements ............ 134CYLINDER BLOCK ASSEMBLYHead Bolts ...............Bottoming Taps ...........Main Bearing Bores ........Deck Height ..............Dowel Pins ..............Rear Main Bearing Oil Seal . .Camshaft Bearings .........Deburring ................Tappet Bores .............Notching the Cylinder Bore forConnecting Rod Clearance ...CC’ing the Block ................... 134......... 134......... 134......... 134......... 135......... 135......... 135......... 135......... 135......... 135......... 135......... 135ADDITIONAL CYLINDER BLOCKPREPARATION AND ASSEMBLY TIPS ..... 135MAINCAPS ........................... 136FREEZE PLUGS ........................ 136CrankshaftINTRODUCTION ....................... 137Balanced and Unbalanced Crankshafts ..... 137Crank Bolt .......................... 137BASIC PREPARATION ................... 137SPECIAL CRANKSHAFT PROCEDURES ... 138Measuring Main Bearing Clearances ...... 138Top Dead Center (TDC) ................ 139Mallory Metal ..... ............... 140Tuff-Triding and Nitriding .............. 1414.2L Engine Crankshaft Installation ....... 141MAIN JOURNALS ...................... 141MAIN BEARINGS ...................... 141Main Bearing Material ....Removal ..............Inspection .......................... 142Fitting ............................. 142Installation .......................... 142Main Bearing Fitting Chart ............. 144Crankshaft End Play .................. 145REAR MAIN OIL SEAL .................. 145Removal ........................... 145Installation .......................... 145VIBRATION DAMPER ................... 145Vibration Damper Failure ............... 146Vibration Damper Performance Tips ...... 146Removal ........................... 146Installation .......................... 147TIMING CHAIN AND SPROCKETS ........ 147Installation Tips ...................... 147Connecting RodsINTRODUCTION ....................... 148BASIC CONNECTING ROD PREPARATIONAND INSTALLATION TIPS ............... 148SPECIAL CONNECTING RODINSTALLATION PROCEDURES ........... 149Rod Ratio ........................... 149Measuring Side Clearance .............. 149Cap Alignment ............ ........ 149Connecting Rod Bolt Protectors .......... 150ALUMINUM CONNECTING RODS ........ 150CONNECTING ROD BEARINGS .......... 151Installation ..... .................. 151Measuring Connecting RodBearing Clearance .................... 151Pistons and RingsPISTONS .............................. 152Piston Compression Ratio Ratings ........ 152Piston Shape ........................ 153Piston-to-Head Clearance ............... 153Valve-to-Piston Clearance .............. 153Piston Race Preparation ................ 153Reversing Pistons With Offset Pins ....... 154CC’ing the Block ..................... 154..l- - 1 1