Hummer H1 (1992-1998). Manual - part 42

2 - 3 5 . 3 . (6.2L or 6.5L)  FUEL INJECTION PUMPS (DB2829-4523, DB2829-4879, or

DB2831-5149) CALIBRATION USING FUEL INJECTION PUMP TEST STA N D

(FTIS) MODEL A8022 (Cont’d)

2-140.16          Change 1

16.

Position throttle arm positioner assembly (3) on bedplate (7) and throttle lever (1).

NOT E

When installing advance indicator, ensure the flat on pointer end
engages into the cam ring slot on fuel injection pump.

17.

Remove two screws (6), timing cover (5), and gasket (4) from fuel injection pump (2) and install
advance indicator with two screws (6).

18.

Remove screw plug from advance indicator block and install quick-connect on advance indicator
block (8).

19.

Attach one end of rubber hose assembly to quick-connect and the other hose assembly end to
auxiliary pressure quick-connect plug on front panel of test stand.

20.

Connect positive red test lead to DC power supply socket marked (+) on test stand, and attach the
alligator clip end of red test lead to the electric shutoff solenoid terminal (9) on fuel injection
pump (2).

21.

Connect black lead to DC black socket marked “P” on test stand and connect alligator clip end of
black lead to ground terminal (10) on fuel injection pump (2).

22.

After installation and hookup of the fuel injection pump has been completed, inspect pump, all
hoses, and related hardware connections before beginning pump calibration. Review operation test
procedures for the FTIS prior to calibrating the fuel injection pump.

2

3

4

5

6

1

7

6

ADVANCE

INDICATOR

2 - 3 5 . 3 . (6.2L or 6.5L)  FUEL INJECTION PUMPS (DB2829-4523, DB2829-4879, or

DB2831-5149) CALIBRATION USING FUEL INJECTION PUMP TEST STA N D

(FTIS) MODEL A8022 (Cont’d)

Change 1           2-140.17

TEST STAND

FRONT PANEL

AUXILIARY PRESSURE

QUICK-CONNECT

QUICK-DISCONNECT

SCREW PLUG

TEST STAND

8

9

2

10

RUBBER HOSE

ASSEMBLY

DC POWER SUPPLY

SOCKET

DC BLACK SOCKET

BLACK TEST LEAD

POSITIVE RED TEST LEAD

2-140.18          Change 1

2 - 3 5 . 3 . (6.2L or 6.5L)  FUEL INJECTION PUMPS (DB2829-4523, DB2829-4879, or

DB2831-5149) CALIBRATION USING FUEL INJECTION PUMP TEST STA N D

(FTIS) MODEL A8022 (Cont’d)

b.

Test Stand Setup Procedures

1.  Cathode Ray Tube (CRT) Monitor
2.  Injection Pump/Auxiliary Selector
3.  DC Supply Selector
4.  Printer Switch
5.  Accumulator Switch
6.  Low-Limit Thumbwheel
7.  Outlet Number
8.  Number of Outlets
9.  Stop

10.  Mode Selector
11.  Ratio Switch
12.  Units Switch
13.  Hi-Limit Thumbwheel
14.  Stroke
15.  Pump Rotation Selector

16.  Speed Select Control
17.  Main Drive Off
18.  Main Drive On
19.  Lube Oil System Off
20.  Calibration Fluid System Off Pushbutton
21.  Nominal Temperature Thumbwheel
22.  Stop
23.  Reservoir Bulkhead Selector
24.  Calibration Fluid System On Pushbutton
25.  Lube Oil System On
26.  Calibration Fluid System
27.  Calibration Fluid Pressure
28.  Lube Pressure

Change 1          2-140.19

2 - 3 5 . 3 . (6.2L or 6.5L)  FUEL INJECTION PUMPS (DB2829-4523, DB2829-4879, or

DB2831-5149) CALIBRATION USING FUEL INJECTION PUMP TEST STA N D

(FTIS) MODEL A8022 (Cont’d)

1.

Set test stand in accordance with the following checklist and instructions in steps 2 through 25.

ITEM

SETTING

Bypass Valve

Open Position

Calibration Fluid System

On

Fluid Selector Valve

Injection Pump

Accumulator Switch

Right

Fluid Shutoff Valve

On

Mode Selector

Auto

Ratio Switch

1:2

Units Switch

mm

3

/stroke

Stroke 

50

Throttle

WOT

Number of Outlets

8

Outlet Number

Between 1 and 8

Low-Limit Thumbwheel

10.0

Hi-Limit Thumbwheel

Limit Thumbwheel 40.0

Pump Rotation Selector

Counterclockwise

Temperature Select

Bulkhead

Nominal Temperature Thumbwheel

44.7

Master Power Switch

On

DC Supply Selector

17.6 Volts Energize Electric Shutoff Solenoid (ESO)

Lube Pressure

4.5 to 5.5 psi

Lube Oil System

Pushbutton On

Main Drive

Pushbutton On

Printer Switch

On

Speed Select Control

Increase/Decrease Control

2.

Set fuel injection pump per calibration chart specifications and settings in para. 2-33, 2-34, or 2-35.

3.

Secure throttle positioner arm in Wide Open Throttle (WOT) position.

4.

Turn calibration fluid pressure regulator fully counterclockwise.

5.

Press calibration fluid system on pushbutton.

6.

Adjust calibration fluid pressure regulator knob clockwise until 4.5-5.5 psi (31-38 kPa) is indicated
on the Cathode Ray Tube (CRT) monitor. Apply 17.6 volts by adjusting the variable DC voltage
supply knob to energize the electric shutoff solenoid.

CAUTION

Be aware that under no circumstances should the transfer pump
pressure exceed 130 psi (896 kPa). Excess pressure will damage
pump.

7.

Turn on main drive system by pressing main drive on pushbutton and holding button depressed for
a minimum of three seconds. Increase pump speed to approximately 150 rpm to prime transfer
pump and bleed air from the high-pressure fuel line nuts at each test nozzle.

8.

Increase pump speed to 1000 rpm. Ensure throttle lever is secured in WOT position. Run pump
approximately 10 minutes to warm the calibration fluid to 110°-115°F (43.3°-46.1°C) and bleed all
air from test stand and fuel pump. Observe transfer pump pressure reading on CRT monitor. It
should be 70-76 psi (483-524 kPa).