Kit C
"Modification of 1983 model year U.S. cars with low-altitude/high-altitude specifications."General
The 1983 U.S. vehicles intended primarily for use in high-altitude areas must be equipped with new high-altitude kit contained the altitude switch or the altitude compensator.
The high-altitude kit installation procedure is as described below. In addition, the procedure for remodification of vehicle from high-altitude specifications to low-altitude specifications is also described.
Figure 1:
(REMARKS)
1983 MY vehicle equipped with former highaltitude kit can be modified using this kit. The procedure for this modification is also described. Applicable text is enclosed in frame. On the other hand, the operations that have been already performed with the former kit are indicated by putting an asterisk (*) at the top of the steps, and these steps may be skipped.
HIGH-ALTITUDE KIT C (483337410) Used on 4WD, 4WD-AT vehicles for 49 states.
1. Component Parts
NOTE: High-altitude kits vary with the type of vehicle. Prior to installation, be sure to read the instruction manual supplied with the kit thoroughly.
When modifying 1983 MY vehicle equipped with former high-altitude kit (483337400) using above kit:
A. Vehicles equipped with Float Chamber Ventilation (FCV; formed by vacuum switching valve (*1);, air control vacuum valve (*2) of Fig. 3, etc.)
^ Following parts out of the parts shown in Fig. 1 are required.
(1) Altitude compensator
(2) Topping screw (3 pcs.)
(3) Hose assembly
(4) Hose assembly
(5) Hose assembly
(6) Hose (5.5 X 12 X 35 X 35) (2 pcs.)
(7) Cap
(10) Clip band (5 pcs.)
(14) Installation manual
*Required modification steps (1), (2)-A and (4) of "2. Installation Procedures.
B. Vehicles without FCV *Required parts shown in Fig. 1
(1) Altitude compensator
(2) Tapping screw (3 pcs.)
(3) Hose assembly
(4) Hose assembly
(5) Hose assembly
(7) Cap
(8) Hose assembly
(9) Hose assembly
(10) Clip band (6 pcs.)
(14) Installation manual
^ Required modification steps (1), (2)-B and (4) of "2. Installation Procedures.
2. Installation Procedures
NOTE: Numbers enclosed with a circle in the following explanation mean the parts shown in Fig. 1
Figure 2:
(1) Installation of altitude compensator and hose
1) Mount the altitude compensator (1) to the rear side of the R.H. strut mount by means of three tapping screws (2)
2) Connect the hose assemblies (3),
(4) and (5) to the altitude compensator (1). (See Detail A.)
3) As shown in Fig. 2, route the hose assemblies (3), (4) and (5) along the heater control hose to the engine side.
4) Run the hose assemblies (3) and
(5) through the clamp located at the air horn section of air cleaner. (See Detail B.)
5) Run the hose assembly (3) through the clamp on the air cleaner body, (See Detail C.)
6) Clip the hose assemblies (3), (4) and (5) together with the heater control hose at three points, using clip bands (10) (3 pcs.). (See Fig. 2.)
Figure 3:
(2) Hose installation on engine
A. Vehicles equipped with Float Chamber Ventiltion (FCV; formed by vacuum switching valve (*1), air control vacuum valve (*2), etc.)
1) Remove rubber caps from the nipple "D" and sections "E" and "F" of the connector located at the rear of the air cleaner.
In the case of vehicles with former high-altitude kit (483337400) already mounted, remove the hose connecting between the nipple "D" and the connector section "E" and the hose connecting between the connector section "F" and the air control valve section "G" instead of per - forming step 1) above. In addition, fit the cap (7) to the air control section "G".
2) Connect the hose (6) (2 pcs.) to the connector section "E" and section "F" respectively.
3) Connect the hose assemblies (3), (4) and (5) coming from the altitude compensator (1) as follows:
^ Hose assembly (3) to the nipple "D"
^ Hose assembly (4) (marked white) to the hose (6) whose other end is connected to the connector section "F"
^ Hose assembly (5) to the hose (6) whose other end is connected to the connector section "E"
4) Clip the hose assemblies (3), (4) and
(5) and the purge hose together, and the hose assemblies (3), (4) and (5) and the AAV control hose together at one point each using the clip bands (2. pcs.) (See Fig. 3.)
Figure 4:
B. Vehicles without FCV
1) Remove rubber caps from the nipple "I" located at the rear of the air cleaner and from the nipples "H" and "J" located on the front and rear of the carburetor.
In the case of vehicle equipped with former high-altitude kit (483337400), remove the hose connecting the nipple "H" with the nipple "I" and the hose connecting the nipple "J" with the nipple "K", instead of performing step 1) above. In addition, put the cap (7) to the nipple "K".
2) Connect the hose assemblies (8) and
(9) to the nipples as follows:
^ Hose assembly (8) to the nipple "J"
^ Hose assembly (9) to the nipple "H"
3) Connect the hose assemblies coming from the altitude compensator (1) as follows:
^ Hose assembly (3) to the nipple "I"
^ Hose assembly (4) to the hose assembly (8)
^ Hose assembly (5) to the hose assembly (9)
4) Clip the hose assembly (8) and the PCV hose together, and the hose assemblies (3), (4) and (5) and the purge hose together and the AAV control hose together, at one point each, using the remaining three clip bands. (See Fig. 4.)
Fig. 5:
^ Replacement and addition of EGR Leak Orifice
Fig. 5:
*(5) Affixing high-attitude label On vehicles equipped with this high-altitude kit, affix the highaltitude label to the reverse side of the engine hood, at the position shown in Fig. 6.
Fig. 5:
3. High-altitude to low-altitude modification procedure To remodify the vehicle, modified to highaltitude specification by use of kit C, into lowaltitude vehicle, proceed as follows:
NOTE: Keep the altitude compensator as mounted to the body and keep the piping as installed.
1) Replace the EGR leak orifice with lowaltitude specifications shown below. (See Fig. 5.)
Vehicle type Orifice diameter
4WD vehicles with manual transmission 0.5 mm
4WD vehicles with automatic transmission ( Rubber cap)
^ 4WD vehicles with manual transmission Remove the hatched positioning hose shown in Fig. 5, put the grooveless orifice, contained in the orifice set (12) into the hose (4 X 9 X 25 X 25) (11), and install the hose to the same position as the removed hose.
^ 4WD vehicles with automatic transmission Remove the two rubber caps, put the orifice with a groove around it, contained in the orifice set (12) into the hose (4 X 9 X 25 X 25) (11) and install the hose to the same position as the removed hose.
(4) Checking and adjusting engine idling speed Check to see that the engine idling speed is within the range shown in the following table and adjust if necessary.
Engine idle speed (rpm)
4WD vehicles with manual 700 +/- 100
transmission:
4WD vehicles with automatic 800 +/- 100
transmission:
[at neutral (or N) or P position]
Figure 6:
2) Check to see that the engine idling speed is within the specified range and adjust if necessary.
Engine idle speed (rpm)
4WD vehicles with manual transmission: 700 +/- 100
4WD vehicles with automatic transmission: 800 +/- 100
[at neutral (or N) or P position]
3) Remove the high-altitude label from the reverse side of the engine hood.
(See Fig. 6.)