Mercedes-Benz Sprinter / Dodge Sprinter. Manual — part 465

upper and lower side of the crescent (1) to the pres-
sure chamber (6) of the housing. The meshing of the
teeth prevents oil flowing from the delivery side to
the intake side. An external gear (3) is eccentrically
mounted in the pump housing. The external gear is
driven by the internal gear (4) which is connected to
the torque converter hub.

DISASSEMBLY

(1) Remove pump gears (1 and 2) (Fig. 186) from

pump housing.

(2) Remove the inner oil pump seal (1) (Fig. 187).
(3) Replace the outer oil pump O-ring (2) (Fig.

187).

INSPECTION

Before measuring any oil pump components, per-

form a thorough visual inspection of all the compo-

nents. If any sign of scoring, scratches, or other
damage is seen, replace the oil pump as an assembly.

SIDE CLEARANCE

Side clearance is the difference between the thick-

ness of the pump gears and the depth of the pocket
in the pump housing. Side clearance can be mea-
sured by laying a flat plate across the mounting face
of the pump housing, and measuring the distance
between the plate and the gears.

Acceptable side clearance:

• Inner gear: 0.064 mm (0.0025 in) max

• Outer gear: 0.069 mm (0.0027 in) max

TIP CLEARANCE

Tip clearance is the difference between the tip

diameters of the gear teeth and the corresponding
diameters of the pocket in the pump housing.

Tip clearance for the inner gear can be checked by

moving the inner gear into tight mesh (2) (Fig. 188)
with the outer gear as shown. Clearance between the
ID of the crescent feature of the housing and the OD
of the teeth of the inner gear (3) should then me
measured at a point 37 mm from the corner of the
crescent (1) feature, as shown below.

Acceptable tip clearance for inner gear:

• 0.85 mm (0.033 in) max

Fig. 186 Oil Pump Gears

1 - OUTER PUMP ROTOR
2 - INNER PUMP ROTOR

Fig. 187 Remove Oil Pump Seals

1 - INNER OIL SEAL
2 - OUTER OIL SEAL

Fig. 188 Oil Pump Measurement

1 - MEASURE 37MM FROM THE CORNER OF CRESCENT
2 - TIGHT MESH HERE
3 - MEASURE TIP CLEARANCE HERE

VA

AUTOMATIC TRANSMISSION NAG1 - SERVICE INFORMATION

21 - 155

ASSEMBLY

(1) Install new inner oil pump seal (1) (Fig. 189)

with Seal Installer 8902-A.

(2) Replace O-ring (2) (Fig. 189).

(3) Lubricate pump gears and place in the pump

housing. Insert pump gear (1) (Fig. 190) so that the
chamfer (arrow) points towards the pump housing.

OUTPUT SHAFT BEARING

REMOVAL

(1) Raise and support vehicle.
(2) Remove the propeller shaft (Refer to 3 - DIF-

FERENTIAL & DRIVELINE/PROPELLER SHAFT/
PROPELLER SHAFT - REMOVAL).

(3) Verify that the transmission is in PARK in

order to prepare for the removal of the output shaft
nut.

(4) Remove the nut holding the propeller shaft

flange to the output shaft and remove the flange.

(5) Remove the transmission rear oil seal with a

suitable slide hammer and screw.

(6) Remove the transmission output shaft washer.

Be sure to tag the washer since it is very similar to
the geartrain end-play shim and they must not be
interchanged.

(7) Remove the transmission rear output shaft

bearing retaining ring (1) (Fig. 191).

Fig. 189 Install New Oil Pump Seals

1 - INNER OIL SEAL
2 - OUTER OIL SEAL

Fig. 190 Oil Pump Gears

1 - OUTER PUMP ROTOR
2 - INNER PUMP ROTOR

Fig. 191 Remove Rear Output Shaft Retaining Ring

1 - RETAINING RING
2 - OUTPUT SHAFT BEARING

21 - 156

AUTOMATIC TRANSMISSION NAG1 - SERVICE INFORMATION

VA

(8) Position Bearing Remover 9082 (1) (Fig. 192)

over the inner race of the output shaft bearing.

(9) Slide the collar (3) (Fig. 193) on the Bearing

Remover 9082 (1) downward over the fingers (3) of
the tool.

CAUTION: Verify that the geartrain end-play shim
has remained on the output shaft and against the
park gear. The shim may be adhered to the bearing
inner race. Retrieve the shim from the bearing and
install over the output shaft and against the park
gear.

(10) Remove the output shaft bearing (3) (Fig.

194).

Fig. 192 Position Remover 9082 On Bearing

1 - BEARING REMOVER 9082
2 - TRANSMISSION CASE
3 - OUTPUT SHAFT BEARING

Fig. 193 Slide Remover 9082 Collar Downward

1 - BEARING REMOVER 9082
2 - TRANSMISSION CASE
3 - COLLAR
4 - FINGERS

Fig. 194 Remove Output Shaft Bearing

1 - BEARING REMOVER 9082
2 - TRANSMISSION CASE
3 - OUTPUT SHAFT BEARING

VA

AUTOMATIC TRANSMISSION NAG1 - SERVICE INFORMATION

21 - 157

INSTALLATION

CAUTION: Verify that the geartrain end-play shim is
properly installed over the output shaft and against
the park gear.

(1) Install output shaft bearing in the rear trans-

mission housing. Using Bearing Installer 9287 (1)
(Fig. 195), install the output shaft bearing (2) into
the transmission housing. The closed side of the
plastic cage must point towards the parking
lock gear.

(2) Install the retaining ring (1) (Fig. 196). Ensure

that the retaining ring is seated correctly in the
groove.

(3) Check that there is no play between the bear-

ing and the retaining ring using feeler gauge.

(4) There must be no play between the retaining

ring and the bearing. If the ring cannot be installed,

a thinner ring must be used. If there is play between
the ring and the bearing, a thicker ring must be
installed. Retaining rings are available in thick-
nesses of 2.0 mm (0.079 in.), 2.1 mm (0.083 in.), and
2.2 mm (0.087 in.).

(5) Install the output shaft washer onto the output

shaft.

(6) Install a new transmission rear seal into the

transmission case with Seal Installer 8902A (1) (Fig.
197).

(7) Verify that the transmission is in PARK in

order to prepare for the installation of the output
shaft nut.

(8) Install the propeller shaft flange onto the out-

put shaft and install an new flange nut. Tighten the
flange nut to 200 N·m (147.5 ft.lbs.).

Fig. 195 Install Output Shaft Bearing

1 - BEARING INSTALLER 9287
2 - BEARING
3 - TRANSMISSION CASE

Fig. 196 Install Rear Output Shaft Retaining Ring

1 - RETAINING RING
2 - OUTPUT SHAFT BEARING

Fig. 197 Install Output Shaft Seal

1 - SEAL INSTALLER 8902A
2 - TRANSMISSION CASE

Fig. 198 Align Staking Tool 9078

1 - PROPELLER SHAFT FLANGE
2 - STAKING TOOL 9078
3 - ALIGNMENT PIN
4 - OUTPUT SHAFT NOTCH

21 - 158

AUTOMATIC TRANSMISSION NAG1 - SERVICE INFORMATION

VA