Dodge Ram Truck 1500-2500-3500. Manual — part 1784
DISASSEMBLY
1. Mark position of support (2) in oil pump body (1)
for assembly alignment reference. Use scriber or
paint to make alignment marks.
2. Place pump body on two wood blocks.
3. Remove reaction shaft support bolts and separate
support (2) from pump body (1).
4. Remove pump inner (3) and outer gears (4).
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5. Remove o-ring seal (11) from pump body. Discard seal after removal.
6. Remove oil pump seal (1). Discard seal after removal.
CLEANING
Clean pump and support components with solvent and dry them with compressed air.
INSPECTION
Check condition of the seal rings and thrust washer on the reaction shaft support. The seal rings do not need to be
replaced unless cracked, broken, or severely worn.
Inspect the pump and support components. Replace the pump or support if the seal ring grooves or machined sur-
faces are worn, scored, pitted, or damaged. Replace the pump gears if pitted, worn chipped, or damaged.
Inspect the pump bushing. Then check the reaction shaft support bushing. Replace either bushing only if heavily
worn, scored or damaged. It is not necessary to replace the bushings unless they are actually damaged.
Oil Pump Assembly
1 - OIL SEAL
7 - BOLTS (6)
2 - VENT BAFFLE
8 - #1 THRUST WASHER (SELECTIVE)
3 - OIL PUMP BODY
9 - INNER GEAR
4 - GASKET
10 - OUTER GEAR
5 - REACTION SHAFT SUPPORT
11 - “O” RING
6 - SEAL RINGS
12 - TORQUE CONVERTER SEAL RING
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Clearance between outer gear and reaction shaft
housing should be 0.010 to 0.063 mm (0.0004 to
0.0025 in.). Clearance between inner gear and reac-
tion shaft housing should be 0.010 to 0.063 mm
(0.0004 to 0.0025 in.). Both clearances can be mea-
sured at the same time by installing the gears in the
pump body and measure pump component clearances
as follows:
1. Position an appropriate piece of Plastigage™
across both gears.
2. Align the plastigage to a flat area on the reaction
shaft housing.
3. Install the reaction shaft to the pump housing.
4. Separate the reaction shaft housing from the pump
housing and measure the Plastigage™ following
the instructions supplied with it.
Clearance between inner gear tooth (2) and outer gear (3) should be 0.051 to 0.19 mm (0.002 to 0.0075 in.). Mea-
sure clearance with an appropriate feeler gauge (1).
Clearance between outer gear and pump housing should be 0.10 to 0.229 mm (0.004 to 0.009 in.). Measure clear-
ance with an appropriate feeler gauge.
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ASSEMBLY
1. Lubricate pump gears (9, 10) with transmission fluid and install them in pump body (3).
2. Install thrust washer (8) on reaction shaft (5) support hub. Lubricate washer with petroleum jelly or transmission
fluid before installation.
3. If reaction shaft seal rings (6) are being replaced, install new seal rings on support hub. Lubricate seal rings with
transmission fluid or petroleum jelly after installation. Squeeze each ring until ring ends are securely hooked
together.
CAUTION: The reaction shaft support seal rings will break if overspread, or twisted. If new rings are being
installed, spread them only enough for installation. Also be very sure the ring ends are securely hooked
together after installation. Otherwise, the rings will either prevent pump installation, or break during instal-
lation.
4. Align and install reaction shaft support (5) on pump body (3).
5. Install bolts (7) attaching reaction shaft support to pump. Tighten bolts to 20 N·m (175 in. lbs.) torque.
Oil Pump Assembly
1 - OIL SEAL
7 - BOLTS (6)
2 - VENT BAFFLE
8 - #1 THRUST WASHER (SELECTIVE)
3 - OIL PUMP BODY
9 - INNER GEAR
4 - GASKET
10 - OUTER GEAR
5 - REACTION SHAFT SUPPORT
11 - “O” RING
6 - SEAL RINGS
12 - TORQUE CONVERTER SEAL RING
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