Conversion of Low Altitude System to High Altitude
FIGURE 1 - EGR VALVE VACUUM CONTROL ASSEMBLY:
Dealers in high altitude areas should encourage owners who have moved to high altitude counties to purchase the service adjustment procedure outlined below, which is considered an owner maintenance expense. See attachment for a list of counties which the Environmental Protection Agency has designated as high altitude counties. Diesel timing should be checked or adjusted at the same approximate altitude at which the vehicle will be driven.
FIGURE 1 - EGR VALVE VACUUM CONTROL ASSEMBLY:
1. Replace the EGR vacuum control valve assembly (Figure 1) with the assembly shown in the parts information.
2. Install timing meter J-33075 or equivalent, set pump timing -4~, and set idle speed to specifications.
3. Remove air cleaner and air crossover assemblies and install screen covers J-26996-2.
FIGURE 2 - INSTALLATION OF PRESSURE TAP PLUG AND SEAL:
4. Install shop towel in the intake manifold valley area under the injection pump head to absorb any fuel leakage. Remove housing pressure tap plug and seal located on the rear of the pump (Figure 2).
5. Using the parts contained in kit, P/N 22516487 or equivalent, assemble lock nut and new seal ("O" ring) to metering valve stop screw.
6. Install assembly in injection pump until lock nut contacts pump housing. Tighten lock nut.
7. Place transmission in park, turn A/C off and start engine.
8. Loosen lock nut and slowly turn metering valve stop screw clockwise until idle speed drops approximately 10 rpms.
9. Turn metering valve stop screw counterclockwise 2-1/2 turns and tighten lock nut.
10. Check installation for fuel leaks and remove shop towel from intake valley.
11. Turn engine off.
12. Remove timing meter and screened covers from intake manifold and reinstall parts removed.
FIGURE 3 - VEHICLE EMISSION CONTROL INFORMATION UPDATE:
13. Type or print with ballpoint pen the dealer code and date in the space provided on the supplemental emission control label, P/N 14057201 or equivalent, Figure 3 (part of kit). The label must be placed next to the existing underhood emission control information label to the extent possible. The label should not be affixed to any equipment that can be easily detached from the vehicle. Wash off the area with soap and water, dry thoroughly, and apply the new label.
PARTS INFORMATION P/N Part
1. EGR Vacuum Control Valve Assembly High Altitude
Application - All models 22515542 or equivalent
2. Kit Contents 22516487 or equivalent
Part Quantity
Lock nut 1
Seal 1
Metering Valve Screw 1
Label, P/N 14057201 or equivalent 1
(See Figure 3)
SUGGESTED TIME
The suggested time to perform High Altitude adjustment and part replacement procedure listed above is 0.4 hour labor.