W350 1 Ton Pickup 4WD V8-360 5.9L VIN 1 4-bbl (1988)
Crankshaft Position Sensor: Service and Repair
REMOVAL
1.
Disconnect vacuum hose at the distributor vacuum control unit. Disconnect distributor pick-up lead wires at wiring harness connectors.
2.
Unfasten distributor cap retaining clips and lift off the distributor cap.
3.
Scribe a mark on the edge of the distributor housing to indicate the position of the rotor as a reference when reinstalling the distributor.
4.
Remove distributor hold down clamp screw and clamp, and carefully lift the distributor from the engine.
SHAFT AND BUSHING WEAR TEST
1.
Remove distributor rotor, by prying up with two screwdrivers under the upper part of the rotor.
2.
Clamp the distributor in a vise equipped with soft jaws and apply only enough pressure to restrict any moverment of the distributor during the test.
3.
Attach a dial indicator to the distributor housing so that the indicator plunger arm rests against the reluctor.
4.
Place one end of a wire loop around the reluctor sleeve just above the reluctor.
5.
Hook a spring scale in the other end of the wire loop.
6.
Apply a 7N (1.5 lb.) pull toward dial indicator and a 4N (1 lb.) pull away from the indicator and read the total movement of the plunger on the
indicator dial. If total indicator movement exceeds .15 mm (.006 in.) the distributor housing and shaft assembly must be replaced.
DISASSEMBLY
1.
Remove the two screws and lockwashers attaching the vacuum control unit to the distributor housing, disconnect the vacuum control arm from the
upper plate, and remove the control.
2.
Remove the reluctor by prying up from the bottom of the reluctor with two screwdrivers not more than 11 mm (7/16 in.) wide, using care to ensure
that no damage occurs to the reluctor teeth.
3.
Remove the two screws and lockwashers attaching the lower plate to the housing and lift off the lower plate, upper plate, and pick-up coil as an
assembly.
4.
If the side play measured during the SHAFT AND BUSHING WEAR TEST measured .15 mm (.006 in.) or more the housing, shaft, reluctor
sleeve, and governor weights must be replaced as an assembly as follows:
a.
Remove distributor shaft retaining pin and slide retainer off the end of the shaft.
b.
Use a file to clean burrs, from around the pin hole in the shaft and remove the lower thrust washer.
c.
Push the shaft up and remove the shaft through the top of the distributor body.
ASSEMBLY
1.
Test operation of governor weights and inspect weight spring for distortion if so equipped.
2.
Lubricate governor weights.
3.
Inspect all bearing surfaces and pivot pins for roughess, binding or excessive looseness.
4.
Lubricate and install upper thrust washer(s) on the shaft and slide shaft into the distributor body. Install shaft retainer and pin.
5.
Install lower plate, upper plate and pick-up coil assembly and install attaching screws.
6.
Attach vacuum advance unit arm to pick-up plate. Install vacuum unit attaching screws and washers.
7.
Position reluctor keeper pin into place on reluctor sleeve. Slide reluctor down reluctor sleeve and press firmly into place.
8.
Lubricate felt pad in top of reluctor sleeve with 1 drop of light engine oil and install the rotor.
INSTALLATION
1.
If engine has not been cranked with distributor removed proceed to step 2 for installation. If engine has been cranked with the distributor removed
proceed to step 3 for installation.
2.
Clean top of cylinder block to insure a good seal between the distributor base and engine block. Position distributor in the engine, making sure
O-ring is in groove of distributor housing and is in good condition. Align rotor with marks previously scribed on the distributor housing. Install
hold down screw finger tight.
3.
If engine has been cranked with distributor removed proceed with the following procedure:
a.
Rotate the crankshaft until the number one piston is at the top of its compression stroke. The mark on the crankshaft vibration damper should
be in line with the "O" TDC mark on the timing chain case cover.
b.
Rotate distributor rotor to position at number one on the distributor cap terminal.
c.
Lower the distributor into the opening, install hold down screw finger tight.
4.
Connect distributor pick-up leads and install distributor cap. Make sure all spark plug wires seat firmly in cap.
5.
Connect vacuum hose to distributor governor (if so equipped).
6.
Set timing, refer to ADJUSTMENTS PROCEDURES.
