4L60-E, 4L65-E Automatic Transmission Fluid Leak from Oil Pump or Bell Housing Area (Remove Burrs on Torque Converter Hub, Pump Drive Slots, Replace Torque Converter Hub-to-Oil Pump Seal Assem. (243))
| Subject: | 4L60-E, 4L65-E Automatic Transmission Fluid Leak from Oil Pump or Bell Housing Area (Remove Small Burrs On Torque Converter Hub, Pump Drive Slots and Replace Torque Converter Hub-to-Oil Pump Seal Assembly (243)) |
| Models: | 2006 Buick Rainier |
| 2006 Cadillac Escalade, Escalade ESV, Escalade EXT |
| 2006 Chevrolet Colorado, Corvette, Express, Silverado, SSR, TrailBlazer |
| 2006-2007 Chevrolet Avalanche, Suburban, Tahoe |
| 2006 GMC Canyon, Envoy, Savana, Sierra |
| 2006-2007 GMC Yukon |
| 2007 GMC Yukon XL |
| 2006 Pontiac GTO |
| 2006 HUMMER H2, H3 |
| 2006 Saab 9-7X |
| with 4L60-E or 4L65-E Automatic Transmission (RPOs M30 or M32) |
Condition
Some customers may comment on an automatic transmission fluid leak. Upon further investigation, the technician may find fluid leaking from the oil pump or bell housing area. This leak may be very slight with only dampness of one or two drops of ATF observed at the bottom of the bellhousing.
Cause
Investigation of 2006 transmissions has shown small scratches or cuts in the torque converter hub-to-pump seal (243). These scratches or cuts may be caused by small burrs on the torque converter hub, pump drive slots.
Correction
Verify that the leak is coming from the oil pump or bell housing area by the use of oil dye in the transmission. Refer to Fluid Leak Diagnosis in SI. Clean the transmission suspected area of all residual oil and drive the vehicle to see if the dye begins to appear. If this is a vehicle with very low mileage and it appears to have a small leak, it could have assembly oil in the bell housing which is not truly a leak.
Once the dye has started to appear, disassemble and inspect for small cuts in the torque converter hub-to-oil pump seal assembly (243). The cuts may be caused by small burrs on the torque converter hub, oil pump drive slots. The burrs can be seen or felt with your finger and if found, the burrs should be removed with a file. Also replace the oil pump seal assembly. Refer to the above illustration (1).Do not replace the torque converter for this concern.
The torque converter hub-to-oil pump seal assembly leak caused by these cuts is typically very small, causing only a few drops of fluid loss.
Parts Information
Part Number | Description | Qty |
|---|---|---|
24202535 | Oil Pump Seal Assembly | 1 |
Warranty Information (excluding Saab U.S. Models)
For vehicles repaired under warranty, use:
Labor Operation | Description | Labor Time |
|---|---|---|
K7100 | Seal, Transmission Oil Pump - Replace | Use Published Labor Operation Time |
K9508* | Inspect and/or Remove Burrs On Torque Converter Hub, Pump Drive Slots | 0.1 hr |
*This labor operation number is for bulletin use only. This number will not be published in the Labor Time Guide. | ||
Warranty Information (Saab U.S. Models)
For vehicles repaired under warranty, use:
Labor Operation | Description | Failed Object | Fault/Reason Code | Location Code | Warranty Type | Repair/Action Code | Labor Time |
|---|---|---|---|---|---|---|---|
4417002 Engine Code S | Pump Gasket and/or O-Ring Seal - R&R or Replace | 44170 | 50 | 0 | 01 | 01 | Use Published Labor Operation Time |
4417003 Engine Code M | -- | -- | -- | -- | -- | -- | Use Published Labor Operation Time |
4417004 | Inspect and/or Remove Burrs On Torque Converter Hub, Pump Drive Slots | -- | -- | -- | -- | -- | 0.1 hr |
