ENGINE - Continued
Injectors - Continued
Inspect injector for external damage; cracked or damaged follower, or body; uneven movement of
control rack etc.
Perform tests on injector as detailed in TEST following. If the injector is to be replaced, check new
injector has passed all tests detailed in TEST following before installing in truck.
Inspect the beveled seat of the injector tube in the cylinder head. Remove any carbon deposits with
reamer J5286-9. Use care to remove only the carbon so that the proper clearance between the injector
body and the cylinder head is maintained. Pack the flutes of the reamer with grease to retain the carbon
removed from the tube. If the injector tube is leaking refer to Injector Tube Repair following.
Fill the injector with clean fuel oil be adding fuel to the inlet filter cap until it runs out of the outlet filter
Insert injector into the injector tube with the dowel pin in the injector body alined with the locating hole in
the cylinder head.
Slide over the injector control rack lever so that it registers with the injector rack.
Install the injector clamp, special washer (with curved side toward injector clamp), and bolt. Tighten bolt
to 25 ft lb (34 Nm) while operating the control rack. Do not overtighten the bolt. Make sure the clamp
does not interfere with the injector follower spring or the exhaust valve springs.
Move the rocker arm assembly into position and secure the rocker arm assembly to the cylinder head by
tightening the bolts to 100 ft lb (136 Nm).
Remove the shipping caps and install the fuel pipes. Use socket J8932-01 to tighten the connections to
15 ft lb (20 Nm). Do not bend the fuel pipes or overtighten the nuts.
Adjust the valve clearance as detailed in para. 2-19.7 and adjust the injector timing as detailed in
Injector removed from truck, see REMOVAL preceding.
JP-4 is a highly volatile fuel. Extraordinary care must be taken when servicing components that use this
fuel. The truck shall be grounded to an approved grounding point if it contains JP-4.