Jeep Engines - Oljeep

~T --TriINTRODUCTIONThe 2.5L engine uses a cast nodular iron crankshaft thatrotates within five (5) main bearings and has a standardbore and stroke of 98.45 x 80.97 mm (3.876 x 3.188").Crankshaft rotation is clockwise, when viewed from thefront of the engine.The crankshaft has a main bearing journal diameter of63.489-63.502 mm (2.4996-2.5001"), and main bearingjournal widths of (No. 1) 27.58-27.89 mm (1.086-1.098"),(No. 2) 32.28-32.33 mm (1.27 1-1.273"), and (Nos. 3,4 and5) 30.02-30.18 mm (1.182-1.188").The crankshaft has a connecting rod journal diameter of53.17-53.23 mm (2.0934-2.0955") and a connecting rodjournal width of 27.18-27.33 mm (1.070- 1.076").For more crankshaft specifications, refer to 2.5L EngineSpecifications, 'Engine Assembly' section of this chapter.~~High Performance CrankshaftFactory engineered high performance crankshaft iscarefully inspected and magna-fluxed. Includes bearings.Stock stroke length. For 2.5L engine only.P4529646High performance crankshaft.C ran ks haf t2.5L POWER TECH IN-LINE 4 (CRANKSHAFT) 338.Bend the cotter pin as illustrated to fabricate the tool(Figure 2-13). With the cotter pin tool in place, rotatethe crankshaft so that the upper bearing insert willrotate in the direction of its locking tab.Note: Because there is no hole in the No. 2 mainjournal, use a tongue depressor or similar soft-facedtool to remove the bearing insert (Figure 2-1 3). Aftermoving the insert approximately 25 mm (I"), removeit by applying pressure under the tab.Using the same procedure just described, remove theremaining bearing inserts (one at a time) for inspection.CONNECTINGROD JOURNALCRANKSHAFT MAIN BEARINGSStreet Performance BearingsVMAIN BEARING CAPSJ8909-144These production style main bearings are made from AL6aluminum. Package includes complete engine set.Standard size. For 2.5L engine only.IFigure 2 - 12P4529648Street performance bearings.CollEuIRemoval1.Disconnect the battery negative cable.I2. Remove the spark plugs.3. Raise the vehicle.4.Remove the oil pan and oil pump as outlined in the'Oiling System' section of this chapter.5.Remove only one main bearing cap and lower insert ata time (Figure 2- 12).6.Remove the lower insert from the bearing cap.7.Remove the upper insert by loosening (DO NOTremove) all of the other bearing caps and inserting asmall cotter pin tool in the crankshaft journal oil hole.IFigure 2 - 13