Usage:
SAE Standard Rotation Engine Illustration
SAE Opposite Rotation Timing Marks For G379 Engine
Auxiliary Drive at upper left turns counterclockwise (view from front) at 1.92 times engine speed.
(1) Water pump drive:
Turns clockwise (view from front) at 1.92 times engine speed.
Diameter of shaft bearing surface (journal) ... 31.636 ± 0.013 mm (1.2455 ± .0005 in.)
Bore in bearing in retainer ... 31.687 ± 0.051 mm (1.2475 ± .0020 in.)
Maximum permissible clearance between shaft bearing surface (journal) and bearing ... 0.20 mm (.008 in.)
(2) Bore in bearing in main idler gear ... 76.175 ± 0.038 mm (2.9990 ± .0015 in.)
Diameter of bearing surface (journal) of shaft ... 76.111 ± 0.013 mm (2.9965 ± .0005 in.)
Maximum permissible clearance between bearing and bearing surface (journal) of the shaft ... 0.25 mm (.010 in.)
End clearance ... 0.11 to 0.38 mm (.004 to .015 in.)
Maximum permissible end play for the gear ... 0.46 mm (.018 in.)
(3) Torque for 5/16" bolts that hold oil line flange ... 43 ± 4 N·m (32 ± 3 lb ft)
(4) Bore in bearings for small idler gears ... 50.800 ± 0.038 mm (2.0000 ± .0015 in.)
Diameter of bearing surface (journal) of shaft ... 50.749 ± 0.013 mm (1.9980 ± .0005 in.)
Maximum permissible clearance between bearing and bearing surface (journal) of shaft ... 0.20 mm (.008 in.)
End clearance for idler gears ... 0.08 to .036 mm (.003 to .014 in.)
Maximum permissible end play of idler gear ... 0.46 mm (.018 in.)
(5) Torque for bolt ... 45 ± 7 N·m (35 ± 5 lb ft)
(6) Oil pump drive:
Turns clockwise (view from front) at 1.5 times engine speed.
Bore in bearing for gear of oil pump ... 53.962 ± 0.051 mm (2.1245 ± .0020 in.)
Diameter of bearing surface (journal) on gear hub ... 53.861 ± 0.013 mm (2.1205 ± .0005 in.)
(7) Torque for 1/2" bolts that hold main idler shaft ... 120 ± 7 N·m (90 ± 5 lb ft)
(8) Crankshaft gear.
(9) Bore in bearing for balance gear ... 40.731 ± 0.048 mm (1.6036 ± .0019 in.)
Diameter of bearing surface (journal) of shaft ... 40.635 ± 0.005 mm (1.5998 ± .0002 in.)
Maximum permissible clearance between bearing and bearing surface (journal) of shaft ... 0.15 mm (.006 in.)
End play of balance gear ... 0.10 to 0.30 mm (.004 to .012 in.)
Maximum permissible end play of balance gear ... 0.48 mm (.019 in.)
(10) Torque for 1/2" bolts that hold small idler shafts ... 120 ± 7 N·m (90 ± 5 lb ft)
Torque for 3/8" bolts that hold small idler shafts ... 55 ± 5 N·m (40 ± 4 lb ft)
(11) Torque for five 1/2" bolts that hold plate to block ... 120 ± 7 N·m (90 ± 5 lb ft)
(12) Left side lower or auxiliary water pump drive:
Turns counterclockwise (view from front) at 1.55 times engine speed.
Bore in bearing for auxiliary water pump shaft ... 31.687 ± 0.051 mm (1.2475 ± .0020 in.)
Diameter of bearing surface (journal) of shaft ... 31.636 ± 0.013 mm (1.2455 ± .0005 in.)
Maximum permissible clearance between bearing and bearing surface (journal) of shaft ... 0.20 mm (.008 in.)