Balance Shaft: Service and Repair

1. Disassemble balance shaft drive as described under ``Camshaft, Replace.''
2. Disassemble camshaft drive as described under ``Camshaft, Replace.''

Fig. 7 Balance shaft drive components exploded view.:

3. When removing and installing balance shaft drive, refer to Fig. 7.
4. When installing balance shaft housing, proceed as follows:
a. Tighten all hexagon head bolts and hexagon nuts finger tight.
b. Install bearing housing with new lightly oiled O-ring without tightening attaching nuts.

Fig. 8 Balance shaft housing cover attaching bolt tightening sequence.:

c. Torque bolts in sequence, Fig. 8. Torque M6 bolts to 6 ft.lbs. Torque M8 stud nuts in two steps to 11 and 22 ft.lbs. Torque M8 bolts in two steps to 11 and 14 ft.lbs. Check movement of balance shaft between each tightening step.
5. Refer to ``Camshaft, Replace'' for assembling camshaft drive, assembling balance shaft drive, installing balance shaft drive gears, and installing and adjusting balance shaft drive belt.

COMPENSATING SHAFT DRIVE
REPLACE

Fig. 9 Exploded view of compensating shaft.:

Balance shaft drive used on earlier models was replaced in mid-1985 by a compensating shaft drive, Fig. 9. For all operations concerning compensating shaft other than those mentioned, follow operations as described for balance shaft.
1. Crankcase upper and lower sections and bearing bridges of compensating shaft are matched and must be installed as set with code numbers matching exactly.
2. When bearing bridges are correctly installed, codes of both bridges should be readable from front.
3. Right side bearing bridges are stamped with a 1 and the left side with a 2.
4. Bearing bridge for left compensating shaft has an oil feed bore for oil supply to turbocharger. When installing compensating shaft cover, it is extremely important to ensure seal is inserted in take-up bore of bearing bridge on naturally aspirated and turbocharged engines.