1. DLLA138P2355 Injector Nozzle Technical Support
1.1. DLLA138P2355 Injector Nozzle Installation Precautions
(1) Clean the injector nozzle in an ultrasonic cleaner for 3-5 minutes before installation, so as to make the stains, dust, rust-proof oil oxides, paraffin base, naphthenic base, intermediate base, salt, lead naphthenate, zinc naphthenate, sodium petroleum sulfonate, barium petroleum sulfonate, calcium petroleum sulfonate, tallow diamine trioleate, rosinamine on the surface of the injector nozzle fall off.
(2) Use compressed air to clean the cleaning fluid attached to the surface of the injector nozzle after cleaning, and clean it up to the standard of use.
1.2. DLLA138P2355 Injector Nozzle Inspection
(1) Check whether there is deformation, cracking, thread damage, quenching, leakage and rust in the guide sleeve, spring, gasket and tight cap of the nozzle. The tight cap of the nozzle must be replaced after being disassembled for more than 5 times, as shown in the following.
Pic No.1
(2) Replace the tight cap of the nozzle and the copper gasket of the injector nozzle.
(3) Check whether the gap between the nozzle needle and the nozzle shell is within the standard range and whether it reaches the standard for use.
- All parts should be examined for wear under a microscope at least 20 times larger
- Nozzle tight cap deformation, cracking, thread damage, quenching, leakage, will lead to black smoke vehicle cap, fuel injector damage.
- Injector opening pressure greater than or less than the specified range may cause injector damage.
- Failure to replace wearing parts in time during maintenance may lead to fuel injector damage.
1.3. DLLA138P2355 Injector Nozzle Test Measurement
(1) Nozzle opening pressure test
Test whether the opening pressure range of the nozzle is within the range specified in the injector maintenance manual (to be verified), if not within the normal range, adjust the nozzle spring to adjust the gasket
- If the value is greater than normal, reduce the oil nozzle spring adjusting gasket; if the value is less than normal, increase the oil nozzle spring adjusting gasket.
(2) Stroke Measurement of Nozzle Needle Valve
Use a measuring tool to measure whether the stroke of the nozzle needle valve is within the range (15-45um) specified in the injector maintenance manual. If not, adjust the stroke of the nozzle to adjust the gasket.
Pic No.2
If the value is greater than normal, thicken the gasket for oil-nozzle needle valve lift adjustment; if the value is less than normal, reduce the gasket for oil-nozzle needle valve lift adjustment.
1.4. DLLA138P2355 Injector Nozzle Installation
(1) Tightening torque of injector nozzle
The torque lever and tightening moment specified in the injector maintenance manual must be installed when the injector nozzle is installed. (50Nm)
Pic No.3
The tightening torque of the nozzle cap must be installed in accordance with the tightening torque specified in the injector maintenance manual.
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