K 2500 Truck 4WD V8-454 7.4L VIN J SFI (1997)
Intake Manifold: Service and Repair
Intake Manifold Removal
NOTE: The lower intake manifold gaskets and seals are reusable. Replace only if the gaskets and seals are damaged.
1. Remove the upper intake manifold.
2. Remove the air conditioning lines at the A/C compressor. Refer to Heating and Air Conditioning.
3. Remove the distributor. Mark the relationship of the distributor housing and the rotor for proper replacement. Refer to Powertrain Management.
4. Drain the coolant. Refer to Cooling System.
5. Remove the upper radiator hose at the thermostat housing. Refer to Cooling System.
6. Remove the heater hose.
7. Remove the wafer pump bypass hose.
8. Remove the fuel line brackets and the fuel rail. Refer to Powertrain Management.
9. Remove the lower intake manifold bolts.
10. Remove the lower intake manifold and the gaskets
11. Clean old pieces of gasket from the gasket surfaces.
12. Clean excessive carbon buildup from the exhaust passages.
13. Clean scale and deposits from the coolant passages.
14. Clean excessive carbon deposits from the Exhaust Gas Recirculation (EGR) passages.
