Table of Functions & Checks and Adjustments Information

Table of Functions



EGR = 0 NO EGR recirculation condition
CHECKS AND ADJUSTMENTS


LOAD SENSOR INJECTOR HOLDER ASSEMBLY INSTALLATION


The load sensor must be handled with care (DO NOT HIT IT).

The injector nozzle assembly in this unit must not be removed from the special injector holder assembly. If it should require replacement, a new fusable link module must also be installed.


INJECTION PUMP ADJUSTMENT

Adjustment procedure for initial timing is unchanged.


Setting: 8~ +/- 75~ B.T.D.C. cylinder No. 4 (0.51 + 0.10 mm.).

Pump piston should be at 0.5 mm. after BDC (Bottom Dead Center).

ELECTRICAL AND VACUUM HOSE SCHEMATIC FOR 1984 CALIFORNIA EGR

Refer to Section 12 of 505 workshop manual.


TESTING THE 1984 CALIFORNIA EGR SYSTEM OPERATION


Use the LED EGR tester (P.N. 90.23) only.

DO NOT USE A TEST LIGHT

- Connect the red reference wire (red LED) in parallel to Wire No. 13 of the vacuum electrovalve.

- Connect the green reference wire (green LED) in parallel to Wire No. 25 of the atmosphere electrovalve.

- Connect the white reference wire (power supply) in parallel to Wire No. 12A of the electrovalve.

- If necessary, ground Wire 47B of the EGR thermocontact to simulate a warm engine.
- Run engine.

- Verify that both electrovalves energize:

Vacuum E.V. energized: red LED "ON": vacuum applied.

Atmosphere E.V. energized: green LED "ON": vacuum dumped, - Visually check diaphragm movement of EGR valve while testing.



To test electronic control box connector plug, first disconnect it from the control box. Remove the upper section of the connector to perform resistance and voltage checks.

Reminder: resistance checks are performed with the ignition key

"OFF".
Voltage Tests

These checks should be made with the ignition key in the "RUN" position.


CONNECTOR PLUG PIN #s READINGS

#4 and #8 At least 11.4
#4 and #12 At least 11.4
#4 and #24 At least 11.4



CHARACTERISTICS OF R131 - R131/1 VE PUMP:

The 1984 Diesel injection pump differs from the earlier models in that it incorporates a cold start advance mechanism. A thermocontact located on the cylinder head will allow cold start advance until the coolant reaches 22~C + 3~ - 2~ or (71.6~F + 5.4~, - 3.6~ In the cooling off process, the cold start advance will not be authorized until the engine coolant temperature has dropped below 10~C + 3~, - 2~ or 50~F + 5.4~, - 3.6~.



A more detailed description of the operating principle will appear in the usual updates of the U.S. 505 Shop Manual.