Usage:
SAE Standard Rotation Engine Illustrated
Auxiliary Drive 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 journal ... 1.245-1.246 in.(31,52-31,65 mm)
Bore in water pump shaft bearing ... 1.248-1.249 in.(31,62-31,65 mm)
Maximum permissible clearance between shaft and bearing ... .008 in.(0,203 mm)
SAE Opposite Rotation Engine Timing Marks for G379 and D379 Engines
(2) Bore in main idler gear bearing ... 3.000-3.001 in.(76,20-76,23 mm)
Diameter of shaft journal ... 2.996-2.997 in.(76,09-76,12 mm)
Maximum permissible clearance between bearing and journal ... .010 in.(0,254 mm)
End clearance ... .003-.009 in.(0,076-0,229 mm)
Maximum permissible end clearance of gear ... .018 in.(0,457 mm)
(3) Torque of oil line flange 5/16" bolts ... 29-35 lb. ft.(4,0-4,8 mkg)
(4) Bore in bearings for small idler gears ... 2.000-2.001 in.(50,80-50,83 mm)
Diameter of shaft journal ... 1.9975-1.9985 in.(50,736-50,750 mm)
Maximum permissible clearance between bearing and journal ... .008 in.(0,203 mm)
Maximum permissible end clearance of idler gear ... .018 in.(0,457 mm)
(5) Oil pump drive:
Turns clockwise (view from front) at 1.5 times engine speed.
Bore in oil pump gear bearing ... 2.125-2.126(53,97-54,00 mm)
Diameter of bearing journal ... 2.120-2.121 in.(53,85-53,87 mm)
(6) Torque for main idler shaft mounting bolts ... 85-95 lb. ft.(11,8-13,1 mkg)
(7) Crankshaft gear.
(8) Torque for 1/2" mounting bolts for small idler shafts ... 85-89 lb. ft.(11,8-13,1 mkg)
Torque for 3/8" mounting bolts for small idler shafts ... 36-44 lb. ft.(5,0-6,1 mkg)
(9) Torque for plate to block bolts 1/2" ... 85-95 lb. ft.(11,8-13,1 mkg)
(10) Left side lower or auxiliary water pump drive:
Turns counterclockwise (view from front) at 1.55 times engine speed.
Bore in auxiliary water pump shaft bearing ... 1.248-1.249 in.(31,70-31,72 mm)
Diameter of shaft bearing journal ... 1.245-1.246 in.(31,62-31,65 mm)
Maximum permissible clearance between bearing and shaft ... .008 in.(0,203 mm)
(11) Bore in balance gear bearing ... 1.6019-1.6025 in.(40,688-40,705 mm)
Diameter of shaft journal ... 1.5996-1.6000 in.(40,630-50,640 mm)
Maximum permissible clearance between bearing and journal ... .006 in.(0,152 mm)
End clearance of balance gear ... .0060-.0135 in.(0,152-0,343 mm)
Maximum permissible end clearance of balance gear ... .019 in.(0,48 mm)