JOHN DEERE ENGINE 4045TF270 (SN AC02633 AND UP) 4. Pull out the injection nozzle using the injection nozzle extractor kit (C), or by using the adapter and the slide grip. See Figure 4-40 on page 217. 5. Clean the injection nozzle hole using the injection nozzle cleaning tool. 6. Remove dirt from the hole with compressed air and cover the hole to keep out foreign materials. 7. Place the nozzle in solvent or clean diesel fuel until the nozzle is clean. Be sure that the carbon stop seal groove is fully immersed.
IMPORTANT:Do not scratch or damage the coating on the nozzle housing above the carbon seal groove. 8. Clean the nozzle tip with a brass wire brush after it has been immersed.
Testing the Fuel Injection Nozzles
ME12002
2. Position the nozzle tip below the top of beaker (D) and 30° from the bottom of beaker (D) to contain all spray in beaker (D), as nozzle spray pattern projects at an angle toward the nozzle center line. See Figure 4-41.
NOTICE: Rapidly operating the pump handle causes inaccurate cracking pressure readings and undue wear on the gauge. 3. Pump the handle several times to force air from the lines and determine the correct pump speed for fuel atomization (atomization is the conversion of bulk liquid into a spray or mist). See Figure 4-41. 4. Fully tighten all connections after forcing the air from the nozzle and line. See Figure 4-41. Checking the Opening Pressure 1. Actuate the nozzle tester (A) rapidly several times to quickly seal the valve. See Figure 441. 2. Open the gauge valve, actuate the nozzle tester (A), and increase the pressure until the measuring instrument needle drops rapidly. This pressure measurement is the nozzle opening pressure for a new or used nozzle. See Figure 4-41.
C
NOTICE: If the nozzle opening pressure is
A
B
D
Figure 4-41 Checking the Fuel Injection Nozzles
not within the specified range, re-adjust the pressure and the valve stroke BEFORE checking clatter and injection pattern, otherwise these measurements may be affected. New or overhauled nozzle with new inside parts
1. Connect Y900-3 and Y900-5 Adapters (C) and Y900-2 Fuel Line (B) (included with D01110AA Fuel Injection Nozzle Tester Adapter Set available from a John Deere dealer) to D01109AA OTC Portable Nozzle Tester (A), but do not fully tighten the connections. See Figure 4-41.
NOTICE: When using the JT25510 Bosch Bench Mounted Nozzle Tester, use the KJD10109 Fuel Line and connect line to tester and nozzle.
909768/BP1207
Opening pressure for adjustment
3698 – 260 psi (255 – 260 bar)
Opening pressure for check
Minimum 3568 psi (246 bar)
Used nozzle Opening pressure for check
Minimum 3408 psi (235 bar)
NOTICE: The actual nozzle opening pressure is not as important as an identical opening pressure for all nozzles. The opening pressure difference among the cylinders is a maximum 102 psi (7 bar).
218
Printed in U.S.A
