MBE 900 – Section 1.4 Front Radial Seal

Section 1.4
Front Radial Seal

The crankcase front radial seal is one of two seals used to retain the lubricating oil in the crankcase.‪

Section 1.4.1
Front Radial Seal Removal

Remove the front radial seal as follows:‪

1. Park the vehicle on a level surface, set the parking brakes, and chock the tires.
2. Open the hood.

   PERSONAL INJURY ‪
   To avoid injury from scalding, drain the radiator when the engine and coolant are cool.‪

3. Drain the radiator if necessary, to remove coolant system components for access to the seal.
4. Remove the upper and lower radiator hoses, and the radiator overflow hose if necessary, for access to seal.
5. Remove the fan shroud bolts.
6. Remove the fan.
7. Remove the fan clutch and the poly-V belt.
   1. Move the fan shroud out of the way.
   2. Remove the poly-V belt. Refer to "8.2.1 Poly-V Belt Removal" .
   3. Remove the fan clutch.
8. Remove the coolant pump pulley.
9. Remove the belt tensioner. Refer to "8.2.3 Belt Tensioner Removal" .
10. Remove the vibration damper. See Figure "Front Radial Seal and Vibration Damper Location" . Refer to "1.9.1 Vibration Damper Removal" .
    

    1. Bolt‪	3. Front Radial Seal‪
    2. Vibration Damper/Pulley‪

    Figure 1. Front Radial Seal and Vibration Damper Location

11. Attach the front seal puller J-46383 to the front radial seal.

    Note: Use a drill bit covered in grease to prevent metal shavings from entering the engine.

    1. Using a drill bit covered in grease, drill three holes into the seal. To locate the holes, look for the indentations in the cover of the radial seal. See Figure "Indentations in the Radial Seal" .
       

       1. Radial Seal‪

       Figure 2. Indentations in the Radial Seal

    2. Install three self-tapping screws through the front seal puller J-46383 and into the holes drilled on the front of the radial seal. See Figure "Installing Self-Tapping Screws" .
       

       1. Self-Tapping Screw (3 qty)‪

       Figure 3. Installing Self-Tapping Screws

12. Turn the bolt in the center of the puller clockwise until the front radial seal is removed.

Section 1.4.2
Front Radial Seal Installation

Install the front radial seal as follows:‪

Note: Do not lubricate the radial seal.

1. Fit the guide sleeve of the front seal installer J-46388 onto the crankshaft. Then push the new radial seal over the guide sleeve. See Figure "Installing the Front Radial Seal" . Make sure the sealing lip of the radial seal is pointing toward the oil pump. Seal must be installed dry.
   

   1. Front Radial Seal‪

   2. Sleeve Guide for Seal‪

   Figure 4. Installing the Front Radial Seal

2. Put the front seal installer J-46388 over the sleeve guide, and using a hammer, install the front seal. Make sure the seal is set back 1.5 mm (0.06 in.) from the face of the oil pump housing. See Figure "Correct Installation of the Radial Seal (cross-section view)" .
   

   Figure 5. Correct Installation of the Radial Seal (cross-section view)

3. Install the vibration damper on the crankshaft. Tighten the M14 x 1.5 bolts in three stages. For detailed information, refer to "1.9.2 Vibration Damper Installation" .
4. Install the belt tensioner. Refer to "8.2.4 Belt Tensioner Installation" .
5. Install the coolant pump pulley and the fan clutch.
6. Install the poly-V belt. Refer to "8.2.2 Poly-V Belt Installation" .
7. Move the fan shroud back into place.
8. Install the fan. Then install the fan shroud.
9. Install the upper and lower radiator hoses, and the radiator overflow hose.

   PERSONAL INJURY ‪
   To avoid injury before starting and running the engine, ensure the vehicle is parked on a level surface, parking brake is set, and the wheels are blocked.‪

   PERSONAL INJURY ‪
   Diesel engine exhaust and some of its constituents are known to the State of California to cause cancer, birth defects, and other reproductive harm.‪ Always start and operate an engine in a well ventilated area. If operating an engine in an enclosed area, vent the exhaust to the outside. Do not modify or tamper with the exhaust system or emission control system.

10. Fill the system with coolant, then start the engine and check the coolant system for leaks.
11. Close the hood, and remove the chocks from the tires.