Oil Pump: Disassembly

Fig 1: Reaction Support, Pump Body & Bolts

Courtesy of DAIMLERCHRYSLER CORP.

When disassembling the transaxle it is necessary to inspect the oil pump for wear and damage.

1. Remove the six reaction shaft support-to-pump body bolts (1). See Fig 1.
   Fig 2: Reaction Shaft Support

   Courtesy of DAIMLERCHRYSLER CORP.

   1 - PUMP BODY

   2 - PUMP GEARS

   3 - REACTION SHAFT SUPPORT

2. Remove reaction shaft support (3) from pump body (1). See Fig 2.
   Fig 3: Oil Pump Assembly Components

   Courtesy of DAIMLERCHRYSLER CORP.

   1 - PUMP BODY

   2 - OUTER GEAR

   3 - INNER GEAR

   4 - REACTION SHAFT SUPPORT

   5 - SEAL RINGS (4)

   6 - REACTION SHAFT

   7 - CRESCENT

3. Remove the pump gears (2,3) and check for wear and damage on pump body (1) and gears. See Fig 3.
   Fig 4: Measuring Outer Gear-To-Pocket Clearance

   Courtesy of DAIMLERCHRYSLER CORP.

   1 - FEELER GAUGE

   2 - OUTER GEAR

   3 - PUMP BODY

4. Re-install the gears (2) and check clearances. See Fig 4.
5. Measure the clearance between the outer gear and the pump pocket (1). Clearance should be 0.089-0.202 mm (0.0035-0.0079 in.).
   Fig 5: Measuring Outer Gear-To-Crescent Clearance

   Courtesy of DAIMLERCHRYSLER CORP.

   1 - FEELER GAUGE

   2 - OUTER GEAR

   3 - CRESCENT

   4 - INNER GEAR

6. Measure clearance between outer gear (2) and crescent (3). Clearance should be 0.060-0.298 mm (0.0023-0.0117 in.). See Fig 5.
   Fig 6: Measuring Inner Gear-To-Crescent Clearance

   Courtesy of DAIMLERCHRYSLER CORP.

   1 - FEELER GAUGE

   2 - OUTER GEAR

   3 - CRESCENT

   4 - INNER GEAR

7. Measure clearance between inner gear (4) and crescent (3). See Fig 6. Clearance should be 0.093-0.385 mm (0.0036-0.0151 in.).
8. Position an appropriate piece of Plastigage across both pump gears.
9. Align the Plastigage to a flat area on the reaction shaft support housing.
10. Install the reaction shaft to the pump housing. Tighten the bolts to 27 N.m (20 ft. lbs.).
11. Remove bolts and carefully separate the housings. Measure the Plastigage following the instructions supplied.
12. Clearance between both gear end faces and the reaction shaft support should be 0.020-0.046 mm (0.0008-0.0018 in.).