A/T - ATF Leakage From Electrical Connector O Rings
Group 24Automatic Transmission
Bulletin Number
24 06 93 (3940)
Woodcliff Lake, NJ
May 1994
Product Engineering
This Service Information bulletin supersedes S.I. 24 O6 93 (3940) dated January 1994 which should be removed from your S.I. binder and discarded.
SUBJECT:
Leaking from the Transmission Electrical Connector
MODELS:
530iA/iTouring, 540iA, 740iA/iL
Situation:
Transmission fluid may be found in the electrical connector or there may be evidence of an oil leak in the area of the transmission electrical connector.
Cause:
Deformation of the O-rings on the electrical connector through exposure to heat or previous damage to the O-rings can lead to a leakage of fluid from this area. Only replacement of the O-rings is necessary; REPLACEMENT OF THE COMPLETE INTERNAL TRANSMISSION HARNESS IS NOT REQUIRED.
Solution:
In the event of a leakage complaint from this area, new 0-rings capable of withstanding higher temperatures should be installed.
SERVICE NOTES
- To remove and install the transmission electrical connector on the A5S 31 OZ transmission (530iA/iT), first remove the guide plate for the parking lock mechanism.
- Before placing the new 0-rings on the transmission electrical connector, coat them with transmission fluid.
- When installing the electrical connector, make sure that the flattened section of the connector faces the outside of the transmission housing.
- After replacing the O-rings, correct the transmission oil level as detailed below.
Fluid Level Checking Procedure
The oil level in replacement transmissions is correct and need not be checked, nor is it necessary to check the oil level during the Quality Certification services (QC I and QC II).
In the event of a complaint, checking the oil level may be useful if there is evidence of leakage or if it is suspected that work has already been undertaken on the transmission.
The following procedure supersedes any previously published procedure on oil level checking for the A5S 310Z or A5S 560Z and must be followed carefully to ensure a proper oil level.
1. The vehicle must be without load and standing on a flat, level surface. With the engine running switch on the low-beam headlights or the air conditioning. This will increase the idling speed and ensure that the transmission's oil pump supplies a sufficient volume of oil to reliably maintain all oil passages filled with oil.
2. The transmission temperature must be between 20°C and 30°C before beginning the checking procedure. Use the Service Tester or MoDiC to determine the transmission oil temperature.
3. Step on brake firmly, apply parking brake fully and move the gear selector lever several times in succession through each gear position, pausing briefly in each gear.
4. With the engine running and the selector lever in PARK or NEUTRAL position, remove the filler plug located in the bottom of the oil sump. Note that some oil will always be trapped above the plug and run out when the plug is removed: this is not an indication of proper filling or overfilling.
5. Add the specified oil until it starts to overflow.
6. With the engine running, reinstall oil filler plug (tightening torque = 100 N-m).
SPECIAL NOTES ON OIL LEVEL CHECKING
It is preferred to begin checking with an oil temperature of 20°C and be prepared to reinstall the oil filler plug at 30°C. The transmission will hold an extra 0.6 liter of oil this way versus topping up at 50°C.
If the oil temperature rises above 50°C during the checking procedure, the resulting oil level will be too low.
If there is a suction sound during the fill-up procedure air is being sucked in at the oil pick-up. This must be avoided as it will cause oil foaming resulting in a reduced oil level. If oil foaming is suspected, shut-off the vehicle and repeat the fill-up procedure after waiting a few hours for the oil to settle down.
Adding Oil (ATF) After Repairs
1. With the engine stopped, add oil to the transmission until it overflows.
2. Insert and tighten the filler screw, select PARK position and start the engine.
3. Remove oil filler plug and add oil until it overflows.
4. Check the oil level as detailed above.
Parts Information:
Description Part Number Quantity
O-rings 24 34 1 421 736 2
(green or white color)
Warranty Information:
Covered under the terms of the applicable BMW New Car Limited Warranty.
Defect Code: 24 35 02 48 00
Labor Operation: Renewing 0-ring on transmission plug
Main Work: 00 50 490
Associated Work: 00 51 550
NOTE:
Main Work:
Use this labor operation number when the only repair performed in the listed warranty repair.
Associated Work:
Use this labor operation number when other repairs or services are performed along with the listed warranty repair.
Under no circumstances should both labor operation numbers be claimed.
Model Main Work FRUs Associated Work FRUs
E32740iA/iL 15 13
E34540iA 15
E34 530iA/iT 17 15