Crankshaft and Cylinder Block Removal and Installation

CRANKSHAFT AND CYLINDER BLOCK





REMOVAL AND INSTALLATION

CAUTION: On the flexible flywheel equipped engines, do not remove any of the bolts "A" of the flywheel shown in the illustration. The balance of the flexible flywheel is adjusted in an assembled condition. Removing the bolt, therefore, can cause the flexible flywheel to be out of balance giving and resulting in damage.

Required Special Tools:
- MB990938: Handle
- MD998776: Crankshaft Rear Oil Seal Installer

Installation Service Points
>>A<< Crankshaft Thrust Bearing Installation





1. Install the two thrust bearings in the number 3 bearing bore in the cylinder block. For easier installation, apply engine oil to the bearings; this will help hold them in position.
2. The thrust bearings must be installed with their groove side toward the crankshaft web.

>>B<< Crankshaft Bearing Installation





When bearing replacement is required, select and install the correct bearing by the following procedure.
1. Measure the crankshaft journal diameter and confirm its classification from the following table. In the case of a crankshaft supplied as a service part, identification colors/ marks of its journals are painted/stamped at the positions shown in the illustration.








2. The cylinder block bearing bore diameter identification marks are stamped at the position shown in the illustration from left to right, beginning at No.1.





For example, if the crankshaft journal outside diameter ID color is "Yellow" and cylinder block bearing bore ID mark is "1," select a bearing whose ID mark is "2" or ID color is "Yellow" for number 1, 2, 4 and 5, and a bearing whose ID mark is "1" or ID color is "Green" for number 3. If there is no ID color paint on the crankshaft, measure the journal outside diameter and select a bearing appropriate for the measured value.





3. Install the bearings having an oil groove to the cylinder block.
4. Install the bearings having no oil groove to the bearing cap.

>>C<< Bearing Cap / Bearing Cap Bolt Installation





1. Install the bearing caps so that the arrow points to the timing belt side.
2. Before installing the bearing cap bolts, check that the shank length of each bolt meets the limit. If it exceeds the limit, replace the bolt.
Limit (A): 71.1 mm (2.79 inches)
3. Apply engine oil to the threaded portion and bearing surface of the bolt.





4. Tighten the bolts to 25 ± 2 Nm (18 ± 1 ft. lbs.) in the tightening sequence shown.





5. Make a paint mark on the head of each bolt.
6. Make a paint mark on the bearing cap at the position 90 degree angle from the paint mark made on the bolt in the direction of tightening the bolt.

CAUTION:
- If the bolt is overtightened, loosen the bolt completely and then retighten it by repeating the tightening procedure from step 4.
- If the bolt is turned less than 90 degree angle, proper fastening performance may not be achieved. Be sure to turn the bolt exactly 90 degree angle.

7. Turn each bolt 90 degree angle in the tightening sequence specified in. step 4, and make sure that the paint marks on the bolt and cap are aligned.





8. Make sure that the crankshaft turns smoothly and the end play is correct. If the end play exceeds the limit, replace the number 3 crankshaft bearings.
Standard value: 0.05 - 0.25 mm (0.002 - 0.009 inch)
Limit: 0.40 mm (0.0015 inch)

>>D<< Oil Seal Installation





Using special tools MD998776 and MB990938, press-fit the oil seal in the case.

>>E<< Sealant Application To Oil Seal Case





1. Apply sealant MITSUBISHI Genuine Part number MD970389 or equivalent to the gasket surface of oil seal case.

NOTE: Be sure to install the case quickly while the sealant is wet (within 15 minutes).

2. Apply engine oil to the oil seal lip, and then install the oil seal case onto the cylinder block.

NOTE: After installation, keep the sealed area away from the oil for approximately one hour.