HOUSING 3332998 - Caterpillar

Tool List
The following tools can be used to install a new spring in a unit injector without removing the injector from the cylinder head.
Spring Replacement Procedure
Illustration 1. Dimensions for fabricated spring compression plate. Thickness = 9.50 mm (.375 in). Deburr sharp edges. Note (A): Holes are for use with injector forcing screw holes (injector group in or out of the engine). Note (B): Holes are for use while the injector group is in the engine.1. Use the procedures in the Service Manual to remove the rocker arm assembly.2. Remove bolts and washers (1) and clamp (2).
Illustration 2. Location of components.3. Center compression plate (3) over the injector and install two 3/8 in - 16 threaded rods (5) in the cylinder head through the holes for the clamp. Install 3/8 in nuts and washers (4) on rods (5).
Illustration 3. Location of components.4. Turn nuts (4) down evenly on both sides while holding tappet assembly (6) in the up position as spring (10) is being compressed. Hold tappet assembly (6) in the up position with a suitable tool placed through the spring coils and under tappet retainer pin (9).
Illustration 4. Location of components.5. Remove keepers (7) and carefully loosen compression plate (3). The tappet assembly should only move as far as tappet retainer pin (9) allows. Remove retainer (8).6. Install new spring (10). Install retainer (8). Use a suitable tool, placed through the coils of the spring to raise tappet assembly (6) to its highest position. Use compression plate (3) to compress the new spring and install spring retainers (7). Be sure that the spring is installed with the dampening coil down. The blue painted coils are at the opposite end of the spring from the dampening coil.7. Use the procedures and specifications in the Service Manual to install injector clamp (2) and install the rocker arms.8. Repeat this procedure for the remaining cylinders.9. Use the procedures and specifications in the Service Manual to set the bridge and valve clearances as well as the injector timing.