Balance Unit Assembly

Balance Unit Assembly





Balance Unit Assembly and Associated Parts

Disassembly
1. Remove the oil pan.
2. Remove the oil pan support.





3. Remove the oil strainer (1) from oil pump and the oil baffle plate (2).

Adjustment





1. Turn crankshaft in engine rotational direction to alignment mark (2) 1st cylinder "TDC".





2. In this crankshaft position, the flattened side (arrows) of both balancer shafts must face downward and must be on a horizontal line.





3. Screw measuring device J-43038 (3) with long knurled bolt (1) into 1st balancer shaft (intake side) and tighter hand-tight measuring arm (5) must point in "9 o'clock" direction shown in this illustration.
Install dial gauge holder with dial gauge (4) on cylinder block.





4. Place pre tensioned probe (6) of gauge on measuring arm of measuring device J-43038.
The probe must be set precisely between the notch marks, square to the plane surface (7).





5. Determine the left and right stops by turning the knurled bolt (2).
Set the dial of the gauge to zero.
Use the knurled bolt (2) to move the 2nd balancer shaft (exhaust side) back and forth. Again -simultaneously read off the tooth backlash from the gauge.
The permissible tooth backlash is: 0.02 mm to 0.06 mm (0.0008 to 0.0024 inch).





6. The tooth backlash must be measured in 4 different positions -turn the crankshaft further at the fastening bolt of the timing belt drive gear by 45° in the engine rotational direction until the measuring arm (2) is at "6 o'clock".





7. Then loosen the knurled bolt (1) fix the measuring arm at "9 o'clock" again and repeat the measurement.
8. If the value determined in one of the 4 measurements lies outside the tolerance 0.02 mm to 0.06 mm (0.0008 to 0.0024 inch), the tooth backlash must be adjusted.








9. Remove balance unit from cylinder block/crankshaft bearing caps and remove with balancer piece. The balancer piece has a number (code), for easy assignment. The tooth backlash can be adjusted by using a balancer piece with a different thickness.

Note: The next larger or smeller balancer alters the tooth backlash by 0.02 mm (0.0008 inch).
Example for selection of balancer piece: The installed balancer piece with the code "70 " gave a tooth backlash of 0.08 mm (0.0031 inch).
If a balancer piece with the code "67" is now installed, the tooth backlash will be approximately 0.06 mm (0.0024 inch).

Caution: Only one balancer piece may be installed.

Reassembly





1. Turn crankshaft in engine rotational direction to alignment mark (2) 1st cylinder "TDC".





2. Turn balancer shafts until the flattened sides (arrows) of both balancer shafts face downward and are on a horizontal line.
3. Install selected balancer piece (2) with balancer shaft unit to cylinder block/crankshaft bearing cap -tighten all fixing bolts to the specified torque.
Torque: 30 Nm (22 ft. lbs.)

CAUTION: Take great care not to chip or dent teeth when meshing gearsets on assembly.

4. After installing the balancer shaft unit, recheck the tooth backlash and readjust if necessary.

Note: If the balancer shaft unit has to be replaced, use the thickest balancer piece with the code "85" for the initial assembly -this guarantees tooth backlash in all conditions.

5. Install oil strainer to oil pump with new seal ring and insert fixing bolts with locking agent to the specified torque.
Torque: 8 Nm (69 inch lbs.)





6. Install oil pan support.
Torque: 20 Nm (14 ft. lbs.)
^ Adjust surfaces of the cylinder block and the oil pan support.
7. Install oil pan.
Torque: 8 Nm (69 inch lbs.)