M11 Series – Service Manual – 009-001   Accessory Drive

Remove the fuel pump.

Refer to Procedure 005-016.

Remove the air compressor, if equipped.

Refer to Procedure 012-014.

To mark the accessory drive pulley position:

• Remove the inspection hole plug (1) in the gear cover.
• Use the accessory driveshaft to rotate the engine until the camshaft
  gear timing mark (2) is visible through the inspection hole.

When the timing mark is visible through the inspection hole, cylinders No. one and six are at top dead center. The accessory drive pulley T-C mark
(3) and keyway (4) are at the 12-o’clock location.

Remove the pulley retainer capscrew.

Remove the accessory drive pulley.

NOTE: This is a slip-fit pulley and does

not require the use
of a puller.

Remove the five seal retaining capscrews, clamping ring, and accessory
oil drive seal.

Refer to Procedure 001-003.

Remove the six capscrews and the accessory drive assembly.

Clean the accessory drive to gear housing gasket surface.

Clean the accessory drive oil seal surface on the front of the gear
cover.

Measure the drive shaft end clearance.

If the shaft end clearance does

not meet these specifications, rebuild or replace the drive unit. Refer to the M11 Shop Manual, Bulletin No. 3666075.

Visually inspect the housing for cracks and non-uniform front and rear gasket sealing surfaces.

Replace the housing or the drive unit if cracks are found or the gasket sealing surfaces

cannot be made uniform using Scotch-Brite®
7448 or its equivalent.

Visually inspect the drive gear (1) for cracked or severely worn teeth.

Replace the drive gear or the drive unit if the drive gear is cracked or abnormally worn teeth are found.

Visually inspect the shaft surface (2). Pay special attention to the pulley hub to shaft shoulder contact area (3). Replace the shaft if scratches, scoring, or fretting is found.

Inspect the dowel pin for damage. Replace if required.

Visually inspect the rear thrust washer for cracks.

Replace the washer if cracks are found. Refer to the M11 Shop Manual, Bulletin No. 3666075.

CAUTION  Care must be used when installing the accessory drive gasket. If the gasket is twisted during the installation of the accessory drive, a leak path (1) will exist between the gasket and the oil passage port at point (2).

Use a small amount of grease or sealant to hold the gasket in place during installation. Use care

not to block the oil passage.

The accessory drive shaft dowel pin

must be at the 12 o’clock location when the accessory drive is installed. Make sure the camshaft gear timing mark “X” is visible through the inspection hole in the front
of the gear cover.

Use a new gasket to install the accessory drive assembly.

Install the six capscrews and tighten.

NOTE: The capscrew (1) located in the lower corner nearest the cylinder block

must be installed with a new copper sealing washer, Part No. 3882885,
and thread sealant, Part No. 3823494, applied to the threads.

Install the accessory drive oil seal.

Refer to Procedure 001-003.

Install the accessory drive pulley.

Refer to Procedure 009-004.

Install the inspection hole plug in the gear cover.

NOTE: The air compressor

must be timed to the accessory drive.

Install the air compressor, if equipped.

Refer to Procedure 012-014.

Install the fuel pump.

Refer to Procedure 005-016.

Operate the engine to normal operating temperature and check for leaks.