Crankshaft Main Bearing(s) - Installation

INSTALLATION





NOTE: Before the Crankshaft can be installed, the proper thickness upper and lower main bearings along with the proper thickness thrust plate have to be selected. Below are tables followed by directions to help you determine the appropriate thickness upper and lower main bearing shell halves and thrush plate.

UPPER BEARING SHELL SELECTION









The top bearing shell halves are assigned to the specific journal of the crankshaft by means of a colored ring on the rear of the upper bearing shell half and numbers or center punch marks, which are stamped into the crankcase near the bearing cap. Only the assigned color and numerical combinations may be fitted together. EXAMPLE: You see the number 2 or two punch marks stamped into the cylinder block, you need to use the Yellow bearing shell half for the upper bearing shell.

LOWER BEARING SHELL SELECTION









The bottom halves of the bearing shells are assigned to the specific journal of the crankshaft by means of a letter engraved on the journal of the crankshaft. Each letter represents a color of the necessary bearing shell. EXAMPLE: If the first letter engraved on the crankshaft is a "r", than the first lower main bearing shell half is the Red main bearing shell half.

THRUST PLATE SELECTION









Thrust plates are assigned to the bearing caps by using the numbers "1" and "0" or "N1" or "N0". These numbers are also engraved on the journal of the crankshaft, usually following the lower bearing identification letters.

NOTE: When installing the bearing shell halves, it is important to keep the order of the colors which is engraved on the journal of the crankshaft.

NOTE: Clean all the journals with solvent and dry thoroughly before installing bearings.

1. Fit the upper main bearing shells with oil holes and oil grooves (6) into the engine block's main journals.
2. Fit the thrust washers (7) into the engine block.
3. Coat the surface of bearings lightly with engine oil.
4. Position the crankshaft in the engine block.
5. Fit the lower main bearing shells (5) into the main bearing journal caps (4).

NOTE: When doing this, ensure that the anti-twist locks of the bottom bearing shell halves are located in the recesses of the bearing caps.

CAUTION: The crankshaft main bearing journal cap bolts M8X75 and M10X90 must always be replaced otherwise there is a risk of fracture.

6. Install the main bearing journal caps (4).




7. Follow the torque sequence shown for the crankshaft main bearing journal cap bolts.
8. Main bearing journal caps must be tightened in two stages.
- Stage one for m8 bolts, 20 Nm (15 ft. lbs.).
- Stage two for m8 bolts, rotate 90° clockwise.
- Stage one for m10 bolts, 30 Nm (22 ft. lbs.).
- Stage two for m10 bolts, rotate 90° clockwise.

9. Turn the crankshaft to check for unobstructed movement.




CAUTION: Connecting rod bolts exceeding 47.6 mm in length must be replaced.

10. Install the connecting rod caps and the bolts to the connecting rod as marked. Piston and Connecting Rod - Installation.
11. Install the oil pump. Engine Oil Pump - Installation.
12. Install the upper oil pan. Engine Oil Pan - Installation.
13. Install the timing chain. Installation.
14. Install a new crankshaft rear radial seal. Installation.