F 250 2WD Pickup V8-302 5.0L VIN N FI (1985)
Intake Manifold: Service and Repair
Lower Intake Manifold
Pre-Service Procedures
The fuel charging assembly consists of the air throttle body, and the upper and lower intake manifolds. Prior to service or removal of the fuel charging
assembly, the following steps must be taken:
1. Open hood and install protective covers.
2. Disconnect negative battery lead and secure it out of the way.
3. Remove fuel cap at tank pressure.
4. Release pressure from fuel system.
Removal
1. Remove intake manifold/throttle body assembly and air cleaner assembly must be removed prior to lower intake manifold removal.
2. Drain the coolant system.
3. Remove distributor assembly, cap and wires. Mark position of distributor and rotor during removal so that they can be installed in their original
position.
4. Disconnect the electrical connections at the Engine Coolant Temperature (ECT) Sensor, Engine Temperature Sending Unit, Air Charge
Temperature (ACT) Sensor, and Knock Sensor (KS).
5. Disconnect the injector wiring harness from main harness assembly.
6. Remove Exhaust Gas Oxygen (EGO) sensor ground wire from intake manifold stud.
NOTE: The plated stud and ground wire must be Installed in the same position as which it was removed.
7. Disconnect fuel supply and return lines from fuel rails.
8. Remove upper radiator hose from thermostat housing.
9. Remove water bypass hose.
10. Remove heater outlet hose at intake manifold.
11. Remove air cleaner bracket by removing three attaching nuts. (Two nuts on intake manifold and one nut on exhaust manifold.)
12. Remove nut securing coil bracket and move bracket out of way.
13. Remove intake attaching bolts and studs, noting location of studs and bolts.
14. Remove lower intake manifold assembly.
Installation
1. Clean and inspect the mounting faces of the lower intake cylinder heads and cylinder block surfaces.