JOHN DEERE ENGINE 4045TF270 (SN AC02633 AND UP)
ME12002
Setting the Opening Pressure
Correcting the Opening Pressure
1. Close the pressure gauge valve of the nozzle tester (A). See Figure 4-45.
NOTICE: Only complete these steps if opening pressure measurements are not within the acceptable range of measurements. See “Setting the Opening Pressure.” A
B
A
Figure 4-45 Testing Opening Pressure C
2. Rapidly actuate the pump to flush the nozzle.
D
3. Rapidly actuate the pump to increase the pressure until the nozzle opens. The gauge quickly drops after the nozzle opens.
Figure 4-46 Setting Opening Pressure
4. Record the opening pressure measurement.
2. Insert the nozzle into positioning clip and secure positioning clip into a vice. See Figure 4-43.
5. Refer to the following table for acceptable fuel injection nozzle RE48786 opening pressure measurements: New or overhauled nozzle w ith new inside parts 3698 – 260 psi O pening pressure for (255 – 260 bar) adjustm ent O pening pressure for Minim um 3568 psi check (246 bar) Used nozzle O pening pressure for check
Minim um 3408 psi (235 bar)
O pening pressure difference am ong cylinders Maxim um pressure difference = 102 psi (7 bar)
6. If measurements are not acceptable, complete the steps in “Correcting the Opening Pressure.”
1. Remove the nozzle from the tester.
3. Remove lift adjusting lock nut (D). See Figure 4-46. 4. Loosen pressure set screw lock nut (A). 5. Remove the nozzle from the positioning clip and vice. 6. Connect the nozzle to the tester, with the nozzle tip facing downward. 7. Unscrew stroke set screw (B) (two or three rotations) until there is no more contact with stroke set screw (B) when turning pressure set screw (C). 8. Screw pressure set screw (C) clockwise (to the right) to increase opening pressure, or unscrew pressure set screw (C) counter-clockwise (to the left) to decrease opening pressure. 9. Check that the opening pressure is at the high limit of the opening pressure measurement. See step 5, of “Setting the Opening Pressure.” 10. Write down the opening pressure measurement. 11. If measurements are not acceptable, repeat steps 1 through 10 of this procedure.
909768/BP1207
222
Printed in U.S.A
