BMW Tech Tip: Hard Shifts/Leak at Torque Converter Seal

BMW Tech Tip: Hard Shifts/Leak at Torque Converter Seal

BMW owners may complain of difficult shifting. An inspection performed by a trained technician may also uncover noise coming from the transmission oil pump or a transmission fluid leak from the radial seal on torque converter. Refer to the following tech tip for helpful service pointers.

AFFECTED MODELS:
• Z3 with GM5 from 6/00 up to 7/01;
• E39 with GM5 from 9/99 up to 7/01;
• E46 and E46xi with GM5 from 6/98 up to 7/01.

SITUATION:
1. All shifts are very hard.
2. Noise from transmission oil pump.
3. Hard shifts with FC30 (mechanical torque converter clutch monitoring) in EGS fault memory. A combination of 1 through 3 above.
4. Transmission fluid leak from radial seal on torque converter.

CAUSE:
Situation 1 through 3: Improper alignment of sliding seal in pump; from start of production to July 2001, transmission serial numbers 55000-209255.

Situation 4: Improper alignment of the torque converter guide sleeve in pump; from start of production to transmission serial number 413022.

CORRECTION:
Determine the affected parts; replace as necessary.

PROCEDURE:
1. Remove the transmission oil pan and check the condition of the oil. The oil shouldn’t smell burnt or be excessively contaminated with wear particles.

2. Remove the transmission and check the torque converter for ease of movement. The torque converter should rotate easily.

3. Remove the torque converter and check the sliding surface of radial oil seal on the torque converter shaft for signs of wear (grooves).

4. If the above checks are OK, replace the transmission torque converter housing with oil pump, using a special torque converter housing repair kit, P/N 24 40 7 520 492. Refer to repair instructions 24 40.

5. If the torque converter shaft is grooved, replace the transmission torque converter housing with oil pump (P/N 24 40 7 520 492), and torque converter (refer to EPC). Refer to repair instructions 24 40.

6. If the transmission oil smells burnt, is heavily contaminated with wear particles or the torque converter is difficult to turn, replace the transmission.

For additional information, visit www.alldata.com.

Technical service bulletin courtesy of ALLDATA.

You May Also Like

Marketing To High-Value Customers

Neglecting vehicles could lead to more costly repairs for customers down the line. This video is sponsored by Continental.

Courtesy of Tire Review

I’m sure you appreciate every customer that does business with your shop, but there’s no secret that some are more high-value than others.

For example, let’s say someone comes into your shop looking to spend the least amount of money possible. Saving money is essential in today’s world, but these customers may not know the value of maintaining their vehicles despite the cost. Neglecting vehicles like this could lead to more costly repairs for customers down the line.

Updated John Bean Website Provides More Information

Redesign makes it easier to locate more in-depth information.

Stertil-Koni Reports Record Lift Orders, Sales in 2022 

Superior engineering, customer support and real-world performance fuel accelerated growth.

Prevent Cold Stress with 3 Steps for Choosing Winter PPE

Protect workers from hypothermia, frostbite, and other dangerous illnesses.

New Digital Lifting Points Guide from ALI

Electronic guide makes it easy to find OEM lifting point information.

Other Posts

Auto Techcelerators Joins Opus IVS

Combination opens new opportunities for innovation and productivity advances in ADAS services processes.

OIL EATER Launches Overnight Stain Remover

Pulls out oil stains in 3 effortless steps: apply, dry & sweep away.

New Master Series HL1000 and PL 500 from NEBO Lights

The HL1000 Headlamp and Task Light provide up to 1,000 lumens of bright light and various hands-free lighting option.

Snap-on Butane Torches Offer Unmatched Versatility

The torches allow maximum flexibility in a compact design.

Snap-on butane torches single-handedly offer techs a reliable and portable 350- to 820-watt heat source for quick jobs in and out of the shop.