Crankshaft Bearing Installation
INSTALLATION SERVICE POINTS
>A<CRANKSHAFT BEARING INSTALLATION
(1) When replacing the bearings, select the bearing according to the identification marks which are embossed on the crankshaft and cylinder block.
(2) The identification mark for the diameter of the cylinder block bearing hole is embossed as shown in the diagram, starting from the No. 1 mark at the front of the engine. Select and install the bearings according to these marks.
(3) Select the bearing from the above table after checking the identification marks according to steps (1) and (2).
1. If the crankshaft and journal outer diameter is 60.000 mm (2.3622 inches), the classification will be "0" and the identification mark will be "0".
2. if the identification mark for the diameter of the cylinder block bearing hole is "I", select bearing "1" according to the rationale in the previous step.
(4) Install the bearing halves with oil groove on the cylinder block side.
(5) Install the bearing halves without oil groove on the bearing cap side.
(6) Install the thrust bearings on both sides of the No. 3 bearing with the grooves facing outward.
>B
(1) Install the bearing cap with the arrow mark toward the timing belt.
(2) Apply engine oil to the threaded portions and bearing surfaces of the bolts.
(3) Tighten the bearing cap bolts to the specified torque in the tightening sequence shown in the illustration.
(4) After installation of the crankshaft bearing, check the crankshaft end play. If the end play exceeds the limit, replace the crankshaft bearing.
Standard value: 0.05 - 0.25 mm (0.0020 - 0.0098 inches)
Limit: 0.3 mm (0.012 inches)
>C
(1) Using the special tool, press-fit a new crankshaft rear oil seal into the oil seal case.
>D
(1) Apply specified sealant to the area shown in the illustration.
Specified sealant: MITSUBISHI GENUINE Part No. MD970389 or equivalent
(2) Apply a small amount of engine oil to the entire circumference of the oil seal lip section, and place the oil seal on the cylinder block.
INSPECTION
CRANKSHAFT JOURNAL OIL CLEARANCE
The crankshaft oil clearance can be measured easily by using a Plastigage, as follows:
(1) Remove oil and grease and any other foreign material from the crankshaft journal and bearing inner surface.
(2) Install the crankshaft.
(3) Cut the Plastigage to the same length as the width of the bearing and place it on the journal in parallel with its axis.
(4) Gently place the crankshaft bearing cap over it and tighten the bolts to the specified torque.
(5) Remove the bolts and gently remove the crankshaft bearing cap.
(6) Measure the width of the smashed Plastigage at its widest section by using a scale printed on the Plastigage bag.
Standard value: 0.02 - 0.04 mm (0.0008 - 0.0016 inches)
Limit: 0.1 mm (0.004 inches)
CYLINDER BLOCK
(1) Visually check for scratches, rust and corrosion. Use also a flaw detecting agent for the check. If defects are evident, correct, or replace.
(2) Using a straight edge and feeler gauge, check the block top surface for warpage. Make sure that the surface is free from gasket chips and other foreign matter.
Standard value: 0.05 mm (0.0020 inches)
Limit: 0.1 mm (0.004 inches)
(3) If the distortion is excessive, correct within the allowable limit or replace.
Grinding limit: 0.2 mm (0.008 inches)
The total thickness of the stock allowed to be removed from cylinder block and mating cylinder head is 0.2 mm (0.008 inches) at maximum.
(4) Check cylinder walls for scratches and seizure. If defects are evident, correct (bored to oversize) or replace.
(5) Using cylinder gauge, measure the cylinder bore and cylindricity. If worn badly, correct cylinder to an oversize and replace piston and piston rings. Measure at the points shown in illustration.
Standard value:
Cylinder I.D. 83.50 - 83.53 mm (3.2874 - 3.2886 inches)
Cylindricity: 0.01 mm (0.0004 inches)
CYLINDER BORING
(1) Determine the oversize piston on the basis of the largest bore cylinder.
(2) Two types of oversize pistons (0.50 mm and 1.00 mm) are available. The standard measuring points for the piston outside diameter are at the positions shown in the illustration.
(3) Based on the measured piston outside diameter, calculate the boring finish dimension.
[Boring finish dimension] = [Piston outside diameter] + [0.02 - 0.04 mm (0.0008 -.0016 inches) clearance to cylinder] - [0.02 mm (0.0008 inches) honing margin]
(4) Bore each cylinder to the calculated boring finish dimension.
(5) Hone to the final finish dimension (piston outside diameter + clearance between piston outside diameter and cylinder).
(6) Check the piston to cylinder clearance.
Standard value: 0.02 - 0.04 mm (0.0008 - 0.0016 inches)