BMW Coupes and Sedans 1970-1988 Repair Guide

Fluid Pan

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REMOVAL & INSTALLATION



1970-82 Models

Under normal conditions, it is not required to remove the drain pan from the transmission. The transmission oil may be drained and refilled at the required intervals using the drain plug. However, if the pan is leaking, a damaged pan gasket is suspected, or if the transmission fluid appears brownish in color, the pan should be removed. The procedure for removing the pan is as follows:

  1. Drive the vehicle for 3-5 miles (5-8 km) to warm up the transmission fluid. Park the vehicle on a level surface. Shut off the engine.
  2.  
  3. Raise and safely support the front of the vehicle on jackstands.
  4.  
  5. Place a drip pan (minimum 2 quart capacity) beneath the drain pan. Remove the transmission level dipstick. Unscrew and remove the transmission drain plug, taking care not to get scalded by the hot fluid.
  6.  
  7. Inspect the drained oil. If the oil has a "burned" smell or is dark brown in color, the transmission should be inspected. Also, if the oil contains tiny iron or aluminum particles (fluid is gray in color), the transmission may need service.
  8.  
  9. On the ZF 22 type transmission, disconnect the oil filler neck at the oil pan, then remove the retaining bolt and bracket at each corner and remove the pan and gasket. On ZF 12 and ZF 20 type transmissions, remove the mounting bolts, noting the location of the 2 clips, and remove the pan and gasket.
  10.  
  11. If desired, service the strainer.
  12.  

To install:
  1. Clean the gasket surfaces, then replace the gasket. Reinstall the pan. On ZF 22 transmissions, place the magnetic disc next to the filter screen in the pan, making sure the retaining brackets are installed with the shorter leg going inside the groove on the pan. Tighten the bolts in small increments in a crisscross pattern to the values found on the pan torque chart.
  2.  
  3. With the car parked on a level surface, and the selector lever in PARK, fill the transmission slowly until the fluid level is 1 / 4 above the minimum mark on the dipstick. Consult 8789CH01_2.xml Routine Maintenance for the proper type of fluid to use and approximate quantities.
  4.  
  5. Start the engine and let it reach normal operating temperature. Check the fluid level with the selector lever in PARK. If the fluid level is not between the marks on the dipstick, add fluid in small amounts until the level is correct.
  6.  

Fluid quantity is slightly more than a pint from one mark to the other.

1983-88 Models
  1. Raise and safely support the vehicle on a level plane. Place a drain pan under the transmission pan. Remove the dipstick, if equipped. On vehicles with locking dipsticks, tilt the top of the dipstick to unlock.
  2.  
  3. Remove the oil filler tube from the pan.
  4.  
  5. Remove the sump pan drain plug, if equipped, and catch the draining fluid.
  6.  
  7. Note the positions of the pan holder at each bolt, then loosen and remove the bolts.
  8.  
  9. Remove the pan and gasket. Remove the screws from the filter. Check that the O-ring from the filter did not stick to the transmission valve body.
  10.  

To install:
  1. Install the new filter and O-ring. Tighten the hardware to 6 ft. lbs. (8 Nm).
  2.  
  3. Clean the pan and magnets. Replace the pan gasket and install the pan on the transmission. Tighten the bolts to 4.5-5.0 ft. lbs. (6-7 Nm).
  4.  
  5. Attach the oil filler tube, if disconnected, and tighten to 71 ft. lbs. (98 Nm).
  6.  
  7. Replace the gasket or crush washer on the drain plug if equipped and tighten to tighten to 11-12 ft. lbs. (15-17 Nm) for transmissions with a grade M10 drain plug, 18 ft. lbs. (25 Nm) on transmissions with a grade M18 drain plug.
  8.  
  9. Fill the transmission with the proper amount of automatic transmission fluid through the dipstick tube, on vehicles with dipsticks, or through the fill plug on transmissions without a dipstick. The transmission will take approximately 3.2 quarts (3.0 liters) of fluid.
  10.  
  11. Check the fluid level once completed.
  12.  

FILTER SERVICE



  1. Drain and remove the oil pan as described in this section.
  2.  
  3. Remove the bolts retaining the strainer to the valve body.
  4.  
  5. Remove the strainer, and clean it in trichloroethylene or equivalent cleaner fluid. Allow to dry.
  6.  

To install:
  1. Install the strainer and gently retighten the mounting bolts in a crisscross pattern. The valve body to transmission bolts should be tighten to 7-8 ft. lbs. (9-10 Nm). The screws which retain the strainer should be tighten to 4-5 ft. lbs. (5-6 Nm).
  2.  
  3. Replace the oil pan as described in this section.
  4.  

 
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