GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2003 🢒 TopKick C-Series (Conventional) C6/C7/C8 🢒 Engine 🢒 Engine Mechanical - 7.8L 🢒 Disassembled Views
Figure 1:

Cylinder Block and Components
Object Number: 736787 Size: LF
(1)Cylinder Block
(2)Piston and Connecting rod
(3)Upper Connecting Rod Bearing
(4)Lower Connecting Rod Bearing
(5)Thrust Washer
(6)Thrust Washer
(7)Lower Crankcase
(8)Crankshaft Bolt
(9)Lower Crankshaft Main Bearing
(10)Oil Slinger
(11)Crankshaft
(12)Upper Crankshaft Main Bearing
(13)Connecting Rod Bolt
(14)Connecting Rod Cap
Figure 2:

Oil Pump and Components
Object Number: 736663 Size: LF
(1)Oil Pump Drive Gear
(2)Oil Pump Body
(3)Oil Pump Relief Valve Assembly
(4)Cotter Pin
(5)Drive Gear
(6)Driven Gear and Shaft
(7)Washer
(8)Idler Gear A
(9)Idler Gear Shaft
(10)Oil Pump Mounting Bolt
(11)Oil Pump Assembly
(12)Idler Gear B Shaft
(13)Snap Ring for Pilot Bearing
(14)Spacer
(15)Pilot Bearing
(16)Crankshaft Bolt
(17)Flywheel
(18)Crankshaft Rear Oil Seal
(19)Flywheel Housing
(20)Idler Gear B
(21)Oil Slinger
(22)Bracket
(23)Bolt
(24)Bolt
(25)Bracket
(26)Oil Pan
(27)Bolt for Oil Pick Up Tube
(28)Bolt for Oil Pick Up Tube
(29)Oil Pick Up Tube
(30)O-ring for Oil Pick Up Tube
Figure 3:

Timing Gear Layout
Object Number: 1682107 Size: MF
(1)Camshaft Gear
(2)Align Mark
(3)Idler Gear B
(4)Align Mark
(5)Air Compressor Gear
(6)Idler Gear D
(7)Crankshaft Gear
(8)Oil Pump Gear
(9)Supply Pump Gear
(10)Idler Gear A
(11)Idler Gear C