17. Camshaft Sprocket Bolts - GMC G Service Manual

6A5-16 7.4 LITER V8
3. Air cleaner.
4. Grille.
5. Air conditioning condenser from its mounting and
swing it forward.
6. Fan, shroud, and radiator. Refer to ENGINE COOL­
ING (SEC. 6B1) and RADIATOR (SEC. 6B2).
7. Generator and bracket.
8. Rocker arm covers, as outlined previously.
9. Fuel line (carbureted engines).
10. Water pump. Refer to ENGINE COOLING (SEC.
6B1).
11. Torsional damper, as outlined previously.
12. Front cover, as outlined previously.
13. Distributor. Refer to ENGINE ELECTRICAL (SEC.
6D).
14. Intake manifold, as outlined previously.
15. Pushrods and hydraulic lifters, as outlined previously.
16. Fuel pump and pushrod (carbureted engines).
• Align the timing marks (figure 24).

17. Camshaft sprocket bolts.

18. Camshaft sprocket and timing chain. The sprocket is
a light interference fit on the camshaft. Tap the
sprocket on its lower edge to loosen it.
19. Crankshaft sprocket (if required). Use J 1619 (figure
25).
20. Camshaft.
• Install two or three 5/16-18 bolts 100-125 mm
(4-5 inches) long into the camshaft threaded
holes. Use these bolts to handle the camshaft
(figure 26).
• Pull the camshaft from the block. Use care to
prevent damage to the camshaft bearings.
Cleaning, Inspection and Repair
Clean, inspect and repair or replace the camshaft and
related components, as outlined in the proper unit repair
manual.
The unit repair manual also describes camshaft bearing
replacement.
M Install or Connect (Figures 24, 25, and 26)
Tool Required:
J 22102 Crankshaft Sprocket Installer
• Coat the camshaft lobes and journals with a high
quality engine oil supplement (GM Engine Oil Supple­
ment or equivalent).
1. Two or three 5/16-18 bolts 100-125 mm (4-5 inches)
long into the camshaft threaded holes. Use these
bolts to handle the camshaft.
2. Camshaft to the engine (figure 26). Handle the cam­
shaft carefully to prevent damage to the camshaft
bearings.
3. Crankshaft sprocket (if removed). Use J 22102 (figure
25). Make sure the timing mark faces outside.
4. Camshaft sprocket and timing chain.
] Important
• Line up the timing marks on the camshaft
sprocket and crankshaft sprocket (figure 24).
5. Camshaft sprocket bolts.
H O Tighten
• Bolts to 27 N*m (20 ft. lbs.).
6. Fuel pump and pushrod (carbureted engines).
7. Hydraulic lifters and pushrods, as outlined previously.
I ? | Important
• Replace all hydraulic lifters, crankcase oil and
filter, and add GM Engine Oil Supplement (or
equivalent) to the engine oil whenever a new
camshaft is installed.
\<fi\ Adjust
• Valves, as outlined previously.
8. Intake manifold, as outlined previously.
9. Distributor. Refer to ENGINE ELECTRICAL (SEC.
6D).
10. Front cover, as outlined previously.
11. Torsional damper, as outlined previously.
12. Water pump. Refer to ENGINE COOLING (SEC.
6B1).
13. Fuel line (carbureted engines).
14. Rocker arm covers, as outlined previously.
15. Generator and bracket.
16. Fan, shroud, and radiator. Refer to ENGINE COOL­
ING (SEC. 6B1) and RADIATOR (SEC. 6B2).
17. Air conditioning condenser.
18. Grille.
19. Air cleaner.
20. Engine cover (G-Van).
21. Battery negative cable.
• Fill the cooling system with the proper quantity and
grade of coolant.
Figure 24 — Timing Marks