GMC G Service Manual page 1101

J 25034-B
Figure 4 — Removing the Pulley
GEAR DRIVEN PUMP
REPLACEMENT
H Remove or Disconnect (Figure 6)
Tool Required:
J 29664 Manifold Cover Set
1. Air cleaner.
] Important
• Cover the air intake with J 29664 to prevent
foreign material from falling into the manifold
(Figure 7).
2. Vacuum hose from the pump inlet.
3. Bolt and bracket holding the drive assembly to the
engine block.
L00184
1. 27 N-m (20 ft. lbs.)
Figure 6 — Gear Driven Vacuum Pump Assembly
4. Pump and drive assembly.
NOTICE: Do not run the engine without the vac­
uum pump installed. Since the oil pump is pow­
ered by the vacuum pump drive gear, no oil
would circulate through the engine. The engine
could be damaged.
I W Inspect
• Gasket on the pump assembly. Replace if necessary.
H Install or Connect (Figure 6)
1. New pump assembly making sure that the gear on
the drive assembly meshes with the gear on the
engine camshaft.
l ^ l Adjust (Figure 8)
• Rotate the pump so the inlet tube faces the front
of the engine.
• Pump should be on a 20-degree angle.
2. Bolt and bracket.
I ^ \ l Tighten
• Bolt to 27 N«m (20 ft. lbs.).
3. Vacuum hose to the inlet port.
4. Air cleaner.
• Remove J 29664 from the air cleaner inlet
(Figure 7).
• Install the air cleaner.
VACUUM PUMPS 6H-5
B-05873