Unit pumps, one for each cylinder, boost minimum fuel pressure to 24,500 kPa (3553 psi) for purposes of injection. The fuel passes through a high-pressure line, a transfer tube inserted into the wall of the cylinder head, and finally into the nozzle holder, where it is injected into a specially-designed swirl cup in the head of the piston.
Attach the adapter J 46384
and impact extractor J 46375
. Thread the narrow end of the adaptor onto the internal threading in the head of the nozzle holder. Thread the impact extractor onto the wide end of the adaptor. See Figure
Do not attempt to take apart the nozzle holder. If there is a problem, replace the nozzle holder.
Using the impact extractor, pull out the nozzle holder.
Remove the impact extractor and adaptor from the nozzle holder.
Take the heat isolator off the nozzle holder. See Figure
. Discard the old O-ring.
1. Nozzle Holder
4. Transfer Tube
2. Heat Isolator
5. Thrust Bolt
Heat Isolator Removal
Nozzle Holder Installation
Install the nozzle holder as follows:
Lubricate the new O-ring with a light coat of grease and install it on the nozzle holder.
Using the heat isolator installer J 46393
, press the new heat isolator onto the nozzle.
Position the new heat isolator over the nozzle.
Place the receptacle from the heat isolator installer over the head of the nozzle holder and the pressure-fit cap over the heat isolator. See Figure
and see Figure
Heat Isolator Installer Components (J 46393)
Place this entire assembly in a vise and close the vise enough to pressure-fit the heat isolator around the nozzle. See Figure
3. Nozzle Holder
2. Heat Isolator
Pressure-Fitting the Heat Isolator onto the Nozzle
Open the vise and remove the two parts of the heat isolator installer from the nozzle holder. Check that the heat isolator is firmly pressed onto the nozzle.
Take care that the nozzle holder is installed correctly and is aligned properly with respect to the transfer tube.