System Specifications
CYLINDER BLOCK
CRANKSHAFT
MAIN BEARING JOURNAL
CONNECTING RODS
PISTONS
PISTON PINS
PISTON RING
SURFACE VARIATION - HEAD-TO-BLOCK
Inspect all surfaces with a straightedge (2) if there is any reason to suspect leakage. If out-of-flatness exceeds 0.019 mm (0.00075 in.) times the span length in inches in any direction, either replace head or lightly machine the head surface. As an example, if a 12.0 inch span is 1.0 mm (0.004 in.) out-of-flat, allowable is 12 x 0.019 mm (0.00075 in.) equals 0.22 mm (0.009 in.). This amount of out-of-flat is acceptable. *Maximum of 0.2 mm (0.008 in.) for grinding is permitted.
MAIN BEARING CAP TORQUE AND SEQUENCE
1. Install each main bearing cap in proper sequence and direction. Tighten all bolts finger tight.
2. Tighten main bearing cap bolts 1-12 in the sequence shown to 20 Nm (15 ft. lbs.).
3. To ensure correct thrust bearing alignment move crankshaft all the way to the rear of its travel.
4. Then, move crankshaft all the way to the front of its travel. Wedge an appropriate tool between the rear of the cylinder block and rear crankshaft counterweight to hold the crankshaft in its forward position.
5. Tighten main bearing cap bolts 1-12 to 61 Nm (45 ft. lbs.) in the sequence shown.
6. Tighten main bearing cap bolts 1-12 to 115 Nm (85 ft. lbs.) in the sequence shown.
7. Tighten main bearing cap side bolts 1-12 to 27 Nm (20 ft. lbs.) in the sequence shown.
8. Tighten main bearing cap side bolts 1-12 to 54 Nm (40 ft. lbs.) in the sequence shown.
MEASURING CRANKSHAFT MAIN BEARING CLEARANCE IN-CAR
PLASTIGAGE METHOD
Engine crankshaft bearing clearances can be determined by use of Plastigage or equivalent. The following is the recommended procedure for the use of Plastigage:
1. Remove oil film from surface to be checked. Plastigage is soluble in oil.
2. The total clearance of the main bearings can only be determined by removing the weight of the crankshaft. This can be accomplished by either of two methods:
PREFERRED METHOD
1. Shimming the bearings adjacent to the bearing to be checked in order to remove the clearance between upper bearing shell and the crankshaft. This can be accomplished by placing a minimum of 0.254 mm (.010 inch) shim (e. g. cardboard, matchbook cover, etc.) between the bearing shell and the bearing cap on the adjacent bearings and tighten bolts to 14-20 Nm (10-15 ft.lb.)
- When checking No. 1 main bearing. Shim No. 2 main bearing.
- When checking No. 2 main bearing. Shim No.1 and No. 3 main bearing.
- When checking No.3 main bearing. Shim No. 2 and No. 4 main bearing.
- When checking No. 4 main bearing. Shim No. 3 and No. 5 main bearing.
- When checking No. 5 main bearing. Shim No. 4 and No. 6 main bearing.
- When checking No. 6 main bearing. Shim No. 5 main bearing.
NOTE: Remove all shims before reassembling engine
ALTERNATIVE METHOD
1. With the weight of the crankshaft being supported by a jack under the counterweight adjacent to the bearing being checked.
2. Place a piece of Plastigage across the entire width of the bearing shell in the cap approximately 6.35 mm (1/4 inch) off center and away from the oil holes. (In addition, suspect areas can be checked by placing the Plastigage in the suspect area). Torque the bearing cap bolts of the bearing being checked to the proper specifications.
3. Remove the bearing cap and compare the width of the flattened Plastigage with the metric scale provided on the package. Locate the band closest to the same width. This band shows the amount of clearance in thousandths of a millimeter. Differences in readings between the ends indicate the amount of taper present. Record all readings taken. Specifications Plastigage generally is accompanied by two scales. One scale is in inches, the other is a metric scale.
4. Plastigage is available in a variety of clearance ranges. The 0.025-0.076 mm (.001-.003 inch) is usually the most appropriate for checking engine bearing proper specifications.
HARMONIC BALANCER TORQUE
NOTE: Lubricate the threads of Crankshaft Damper Installer 9943 (2) using Mopar(R) Nickel Anti-seize Compound or equivalent, before beginning crankshaft damper installation.
1. Install crankshaft damper (1) using Crankshaft Damper Installer 9943 (2).
2. Install and tighten damper bolt to 176 Nm (130 ft. lbs.).
3. Install the crankshaft pulley. Tighten crankshaft pulley bolts to 23 Nm (200 in. lbs.).