Crankshaft: Service and Repair

When the crankshaft bearing needs replacing, select and install a proper 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 of its journals are painted 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 the front of engine, beginning at No 1.





3. Select a proper bearing from the table on the basis of the identification data confirmed under steps 1 and 2.

Example:
- If the measured value of a crankshaft journal outer diameter is between 56.994 - 57.000 mm (2.2439 - 2.2441 inch), the journal is classified as "1" in the table in case the crankshaft is also replaced by a spare part, check the identification colors of the journals painted on the new crankshaft. If the color is yellow, for example, the journal is classified as "1 "
- Next, check the cylinder block bearing hole identification mark stamped on the cylinder block. If it is "0", read the "Bearing identification mark" column to find the identification mark of the bearing to be used. In this case, it is U1".





4. Install the bearings having an oil groove to the cylinder block.
5. Install the bearings having no oil groove to the bearing cap.
6. Install the bearing caps so that the arrow points to the timing belt side.





7. Before installing the bearing cap bolts, check that the shank length of each bolt meets the limit. If the limit is exceeded, replace the bolt. The maximum limit (A) is 71.1 mm (2.80 inch).
8. Apply engine oil to the threaded portion and bearing surface of the bolt.





9. Tighten the bolts to 25 Nm (18 ft. lbs.) in the tightening sequence shown.
10. Make a paint mark on the head of each bolt.
11. Make a paint mark on the bearing cap at the position 90 - 100° clockwise.
12. According to the tightening sequence, give a 90 - 100° turn to each bolt and make sure that the paint mark on the bolt and that on the cap are in alignment.

NOTE:
- If the bolt is turned less than 90°, proper fastening performance may not be expected. When tightening the bolt, therefore, be careful to give a sufficient turn to it.
- If the bolt is overtightened (exceeding 100°), loosen the bolt completely and then retighten it by repeating the tightening procedure from step 1.





13. After installing the bearing caps, make sure that the crankshaft turns smoothly and the end play is correct. If the end play exceeds the limit, replace No. 3 crankshaft bearings.
Standard value: 0.05 - 0.18 mm (0.0020 - 0.0071 inch).
Limit: 0.25 mm (0.0098 inch).





14. Installation the oil seal using crankshaft rear oil seal installation tool Nos. MD998776 and MB990938, or equivalent.





15. Apply Mitsubishi Genuine Part No. MD970389, or equivalent sealant, to the oil seal case.

NOTE:
- Be sure to install the case quickly while the sealant is wet (within 15 minutes).
- After installation, keep the sealed area away from the oil and coolant for approximately one hour.