Suzuki XL7 2007 Service Manual page 1573

Dye and Black Light Method
A fluid dye and black light kit is available from various
tool manufacturers.
1. Follow the manufacturer's instructions in order to
determine the amount of dye to use.
2. Install the dye. Refer to "Transmission Fluid Check".
3. Detect the leak with the black light.
4. Make the necessary repairs.
Find the Cause of the Leak
Pinpoint the leak and trace the leak back to the source.
You must determine the cause of the leak in order to
repair the leak properly. For example, if you replace a
gasket, but the sealing flange is bent, the new gasket will
not repair the leak. You must also repair the bent flange.
Before you attempt to repair a leak, check for the
following conditions, and make repairs as necessary:
Gaskets
• Fluid level/pressure is too high
• Plugged vent or drain-back holes
• Improperly tightened fasteners
• Dirty or damaged threads
• Warped flanges or sealing surface
• Scratches, burrs, or other damage to the sealing
surface
• Damaged or worn gasket
• Cracking or porosity of the component
• Improper sealant used, where applicable
• Incorrect gasket
Seals
• Fluid level/pressure is too high
• Plugged vent or drain-back holes
• Damaged seal bore
• Damaged or worn seal
• Improper installation
• Cracks in component
• Manual or output shaft surface is scratched, nicked, or
damaged
• Loose or worn bearing causing excess seal wear
Automatic Transmission:
Possible Points of Fluid Leaks
Control Valve Body Cover (29)
• Incorrectly tightened control valve body cover bolts
• Improperly installed or damaged control valve body
cover sealant
• Damaged control valve body cover or mounting face
Case Leak
• Lube Fill Plug (70)
• Wiring connector O-ring seal (46)
• Damaged manual shift shaft seal assembly (713)
• Loose or damaged fluid cooler pipe fitting seals (87)
• Loose fluid pressure test hole plug (66)
• Porous casting
Leak at the Torque Converter End
• Converter leak in the weld area
• Converter seal lip cut. Check the converter hub for
damage
• Converter seal bushing moved forward and damaged
• Converter seal garter spring missing from the seal
• Porous casting of the transmission case or the fluid
pump
Leak at the Vent
• Overfilled system
• Water or coolant in the fluid. The fluid will appear
milky
• Transmission case porous
• Plugged vent (815)
• Drain-back holes plugged
5A-163