Contents: Selection of crankshaft main bearing…⤓ Installing crankshaft main bearing…⤓ Crankshaft axial clearance ⤓ Installing the rear crankshaft oil…⤓
Selection of crankshaft main bearing shells
Note: If the liner needs to be replaced, select and install the correct size liner.
If the crankshaft is supplied as a spare part, identify the color or symbol marks of the crankshaft main journals, which are stamped in the location shown in the figure. If identification of the crankshaft by marks is not possible (marks are missing), then measure the diameter of each crankshaft main journal.
Identify the symbolic identification marks on the cylinder block (dimension groups of bore diameters for main bearings), which are stamped in the location shown in the figure, in the direction from the front to the rear of the block. The mark for journal No.1 is located on the front side of the engine (on the timing belt side).
The crankshaft main bearing shells are identified by color and/or symbol marks, which are located as shown in the figure.
 |  |
In accordance with the specific marks on the crankshaft (or the measurements of the main journals) and the identification marks on the cylinder block, select the correct main bearing shells according to the table provided.
Installing crankshaft main bearing shells
Install the upper crankshaft main bearing shell into the cylinder block. The upper crankshaft main bearing shell has a groove for supplying lubricant.
Install the lower crankshaft main bearing shell into the crankshaft bed.
Install thrust half rings on both sides of main bearing No.3 with the grooves facing outward (towards the counterweight cheek).
Installing the crankshaft bed
Before installing the mounting bolts, check that the rod length for each bolt does not exceed the maximum permissible value. If the limit is exceeded, replace the bolt.
Maximum permissible value (no more than): 71.1 mm.
Install the crankshaft bed onto the cylinder block so that the arrow on it is located on the timing belt side.
Apply engine oil to the bolt threads and under the bolt heads.
Tighten the crankshaft bed mounting bolts to the specified tightening torque in the sequence shown in the illustration.
Tightening torque: 25±2 Nm.
Apply a color mark to the head of each bolt and tighten the crankshaft bed (bearing cap) bolts an additional 90° (1/4 turn) in the sequence shown above.
Caution! If the bolt is turned at an angle less than 90°, the crankshaft bed will not be secured sufficiently.
Attention! If the bolt is turned at an angle of more than 100°, unscrew the bolt and repeat the tightening procedure.
Make sure the crankshaft rotates smoothly.
(The text of the article was obtained from the website MitsubishiMan.ru)
Check the crankshaft axial clearance.
Table for selection of crankshaft main bearing shells (Engine 4G63-7)
Table for selection of crankshaft main bearing shells (Engine 4G64)
Table for selection of crankshaft main bearing shells (Engine 4G69)
Crankshaft axial clearance
Nominal:
- Engine 4G63-7: 0.05–0.25 mm.
- 4G64 engine: 0.05–0.18 mm.
- 4G69 engine: 0.05–0.25 mm.
Maximum permissible:
- Engine 4G63-7: 0.25 mm.
- Engine 4G64: 0.25 mm.
- Engine 4G69: 0.40 mm.
Installing the rear crankshaft oil seal
Using a special mandrel, install the new seal into its housing.
Installing the crankshaft rear oil seal housing
Apply the specified sealant to the oil seal housing in the areas shown in the figure.
MITSUBISHI GENUINE Sealant Part # MD 970389, Three Bond 1207F or equivalent.
Apply a thin layer of engine oil to the working lip of the oil seal around its entire circumference.
Note: Install the seal housing within 15 minutes after applying the sealant.
After installation, do not allow oil or coolant to come into contact with the sealant-coated surfaces of the seal housing.
Install the oil seal housing onto the cylinder block and tighten its mounting bolts to the specified torque.
Tightening torque: 11±1 Nm.