M11 Series – Service Manual – 006-025   Static Injection Timing

Remove the rocker lever cover. Refer to Procedure 003-011 (Rocker Lever Cover) in Section 3.

Remove the injector from cylinder Number 1. Refer to Procedure 006-026 (Injector) in Section 6.

NOTE: It is not necessary to remove all injectors; however, engine rotation will be easier with all injectors removed.

The timing tool, Part Number 3824942, can be installed without removing the rocker housing.

Install the piston plunger rod (1) in the injector bore of Number 1 cylinder.

Align the swivel bracket (2) with the injector hold-down capscrew hole.

Install capscrew, Part Number 3823600, through the swivel bracket. The capscrew is included with the timing tool kit.

CAUTION  Do not tighten the capscrew too tightly. The capscrew can be damaged.

Tighten the capscrew (3) enough to hold the timing fixture rigidly.

Position the timing tool push tube plunger bracket (4) on the backside of the center bracket (5).

Use the alignment tool (6), Part Number 3376180, to align the push rod plunger rod (7).

Be sure to tighten the clamp handle (8) after the plunger rod is aligned, and remove the alignment tool.

Install the injector push rod (9) between the injector camshaft follower and the plunger rod.

The push rod (9) must be vertically aligned with the plunger rod. If it is not, incorrect timing values will result. Be careful not to drop the push rod into the engine.

CAUTION  Use the accessory driveshaft to rotate the crankshaft. If another method is used, the injection timing will not be correct, or the engine can be damaged.

Determine the piston top dead center (TDC) on the compression stroke by rotating the accessory driveshaft clockwise.

The piston is on the compression stroke when both plungers move in an upward direction at the same time. Top dead center is indicated by the maximum clockwise indicator position of the piston travel indicator pointer.

CAUTION  Both indicators must have a travel range of at least 6.35-mm [0.250-in], or the indicators will be damaged.

Position the gauge contact tip in the center of the plunger rod, and lower the gauge to within 0.63-mm [0.025-in] of the fully compressed position.

Set the dial indicator over the piston plunger rod to zero “0” when the piston plunger rod has reached maximum upward movement (TDC).

Rotate the accessory driveshaft back and forth, before and after the zero “0” indicator reading, for approximately 3 degrees to be sure the piston is at top dead center.

Rotate the accessory driveshaft clockwise to 90-degrees after top dead center (ATDC).

The piston plunger will be at the “L10 90 degree” mark on the timing fixture.

Position the push rod dial indicator contact tip in the center of the plunger rod, and lower the gauge to with in 0.63 mm [0.025 in] of the fully compressed position.

Set the push rod dial indicator to zero “0.”

Rotate the accessory driveshaft counterclockwise to top dead center.

Continue to rotate the accessory driveshaft counterclockwise until the crankshaft is at 45-degrees before top dead center (BTDC). This step is necessary to remove gear backlash in the engine.

Rotate the accessory driveshaft clockwise slowly until the piston travel gauge is at 5.160-mm [0.2032-in] before top dead center.

If the crankshaft is rotated beyond the 5.160-mm [0.2032- in] BTDC position, the crankshaft must be rotated counterclockwise back to the 45-degrees before top dead center mark.

Read the push rod travel gauge counterclockwise from zero “0.” This travel represents the injection timing value. In the example shown, the value is 1.98-mm [0.078-in].

To verify the correct injection timing for a particular engine, check the Control Parts List (CPL) number on the engine dataplate. Refer to the CPL Manual, Bulletin 3379133. Timing codes are listed as two alphabetical characters.

If the indicator reading is lower than the specification, the timing is advanced.

If the indicator reading is higher than the specification, the timing is retarded.

NOTE: The push rod must be vertically aligned with the plunger, or incorrect timing values will result. Repeat the procedure if in doubt.

Injection timing can be changed by removing the camshaft gear and installing an offset key. Refer to Procedure 001-012 (Camshaft Gear (Camshaft Installed)) in Section 1.

The accompanying table lists offset keys by part number and degree of offset.

Never advance injection timing beyond the specification limits. The engine’s durability will be diminished.

If the arrow on the key is pointing toward the engine, the timing is retarded.

If the arrow is pointing away from the engine, the timing is advanced.

After installing a new timing key, always recheck the timing to be sure the timing is within the specifications.

Install the injector(s). Refer to Procedure 006-026 (Injector) in Section 6.

Install the rocker lever cover. Refer to Procedure 003-011 (Rocker Lever Cover) in Section 3.