Engine - High Altitude Conversion Package

84chrysler4 Models


1984 318-4V & 360-4V Heavy Duty Truck


Subject


High Altitude Conversion Package & Adjustment for Improved Engine Performance


Index


EMISSIONS


Date

11/12/84

No.


25-05-84


P-5036C


A package is now available to accommodate a customer who wishes to convert his 1984 low altitude vehicle for improved high altitude (over 4,000 feet above sea level) engine performance.

Vehicles with the low altitude package transferred to service in high altitude areas may exhibit undesirable driveability. However, the installation of a high altitude conversion package is voluntary and at the customer's expense.

The high altitude field conversion packages and procedures outlined below have been authorized on the following 1984 non-altitude equipped engine families in service at altitudes above 4,000 feet above sea level..

CONVERSION INSTRUCTIONS

Sea Level to Altitude

IMPORTANT: IN SOME OF THE CONVERSION PROCEDURES YOU WILL BE REQUIRED TO INSTALL A NEW VEHICLE EMISSION CONTROL INFORMATION UPDATE (VECIU) LABEL, PN 4275084.

FIGURE 1:

THIS LABEL HAS TWO AREAS THAT ARE IMPACT IMPRINTABLE WITH A TYPEWRITER (FIGURE 1).

IF YOU ARE REQUIRED TO READJUST TIMING, CURB IDLE SPEED, OR FAST IDLE SPEED TO A SPECIFICATION DIFFERENT THAN THE ORIGINAL VECI LABEL, THEN JUST TYPE IN THE NEW SPECIFICATION AFTER THE SUBJECT OPERATION. IF YOU ARE ASKED TO REFER TO THE ORIGINAL VECI LABEL SPECIFICATIONS, TYPE IN ON THE RIGHT HAND SIDE OF THE LABEL "REFER TO ORIGINAL VECI LABEL".

IN EVERY CASE WHERE THIS LABEL IS USED, TYPE IN AFTER - AUTHORITY OF - TECHNICAL SERVICE BULLETIN #25-05-84, AND YOUR DEALER CODE BELOW. LABEL PN 4275084 IS AVAILABLE FROM PARTS SUPPLY.

Conversion Procedure

1. On the 360-4V only, replace the secondary metering jets with PN 4293720.

2. Relieve the tension on the secondary air valve spring by one turn clockwise (both 318 and 360).

3. Adjust the secondary air valve opening to 1/2" (both 318 and 360).

4. Reset basic timing from 4~ to 8~ BTD on 360-4V and from 8~ to 12~ BTD on 318-4V.

5. Reset idle and propane speeds to sea level specifications at altitude.

6. Refer to 1984 Rear Wheel Drive Truck Service Manual for correct procedures for the above adjustments.


7. Type Vehicle Emission Control Information Update Label, PN 4275084, as shown in Figure 1 and install next to or near the original VECI label.

NOTE: VEHICLE SHOULD BE RETURNED TO ITS ORIGINAL CONDITION IF DRIVEN AT LOW ALTITUDE.

POLICY: Information only