Oil Pump: Disassembly

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

1. Remove the reaction shaft support-to-pump body bolts. See Fig 1.
   Fig 1: Reaction Support-to-Pump Body Bolts

   Courtesy of DAIMLERCHRYSLER CORP.

   1 - BOLT (6)

   2 - PUMP BODY

   3 - REACTION SHAFT SUPPORT

2. Remove reaction shaft support from pump housing. See Fig 2.
   Fig 2: Reaction Shaft Support

   Courtesy of DAIMLERCHRYSLER CORP.

   1 - PUMP BODY

   2 - PUMP GEARS

   3 - REACTION SHAFT SUPPORT

3. Remove the pump gears and check for wear and damage on pump housing and gears. See Fig 3.
   Fig 3: Oil Pump Assembly

   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

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

   Courtesy of DAIMLERCHRYSLER CORP.

   1 - FEELER GAUGE

   2 - OUTER GEAR

   3 - PUMP BODY

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

   Courtesy of DAIMLERCHRYSLER CORP.

   1 - FEELER GAUGE

   2 - OUTER GEAR

   3 - CRESCENT

   4 - INNER GEAR

7. Measure clearance between inner gear and crescent. See Fig 6. Clearance should be 0.093-0.385 mm (0.0036-0.0151 in.).
   Fig 6: Measuring Inner Gear-to-Crescent

   Courtesy of DAIMLERCHRYSLER CORP.

   1 - FEELER GAUGE

   2 - OUTER GEAR

   3 - CRESCENT

   4 - INNER GEAR

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. See Fig 1. 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.).