ATF Supply
ATF Supply
CAUTION!
Only the same versions of ATF pump and ATF supply may be used - they are recognized by aligning oil bores. If versions are mixed, ATF pump can not build up pressure.
2 - Locking washer
• Checking for deformation
4 - ATF pump housing
• Checking contact surfaces for grooves and signs of wear => [ Checking components of ATF pump for grooves
and signs of wear ]
• Checking brass sleeve for wear => [ Checking brass sleeve of ATF pump housing for
wear ]
5 - Ring gear
• Checking contact surfaces for grooves and signs of wear => [ Checking components of ATF pump for grooves
and signs of wear ]
6 - ATF pump wheel
• Checking contact surfaces for grooves and signs of wear => [ Checking components of ATF pump for grooves
and signs of wear ]
• Check yoke in ATF pump wheel => [ Check yoke in ATF pump wheel ]
8 - Intermediate panel
• Checking contact surfaces for grooves and signs of wear => [ Checking components of ATF pump for grooves
and signs of wear ]
10 - ATF supply
• Checking volume controlling valve of ATF pump for freedom of movement => [ Checking volume controlling valve in ATF pump ]
14 - Stator shaft
• Checking brass sleeves for wear => [ Checking brass sleeves of stator shaft for
wear ]
• Checking splines for wear
• Must be securely seated in ATF supply housing, replace both components if loosely seated
16 - Rectangular rings for clutch "B"
• Checking for wear => [ Checking rectangular rings item for wear ]
17 - Rectangular ring for clutch "A"
• Checking for wear => [ Checking rectangular ring item for wear ]
18 - Axial needle bearing
• Perform visual check for damage: Axial needle bearing and their contact surfaces must be like new, replace if necessary
Checking brass sleeve of ATF pump housing for wear
- Check contact surface of brass sleeve - arrow - for wear.
• Contact surface must not be heavily scored and/or show blue discoloration.
In case of deep grooves and/or blue color:
- Replace ATF pump.
If no blue discoloration and only small grooves are detected, proceed as follows:
- Sandpaper (600 grit, oiled) contact surface 1 to 2 times.
- Carefully wipe off with a clean rag and check contact surface.
• Contact surface must now be like new.
If scores cannot be removed in this manner:
- Replace ATF pump.
- Check torque converter hub - arrow - for wear.
If wear on torque converter can be recognized:
- Replace torque converter.
Checking components of ATF pump for grooves and signs of wear
- Check contact surfaces of the following components for grooves and signs of wear:
2 ATF pump housing
3 Ring gear
4 ATF pump wheel
5 Intermediate panel
• Surfaces of contact surfaces must be matt or shiny but without any sign of groove.
• A malfunctioning ATF pump will cause delays in drive and shifting procedures.
Check yoke in ATF pump wheel
- Check whether coupling plates - arrows - on ATF pump wheel show pressure marks or are broken off, replace ATF pump if necessary.
Causes:
A Torque converter not completely inserted during transmission or engine installation
B Centering sleeve for torque converter not inserted in crankshaft
CAUTION!
Always check for broken coupling plates and remove.
Checking volume controlling valve in ATF pump
Check volume controlling valve as follows:
- Move valve piston against spring pressure.
• Valve piston must move freely in both directions of movement - arrow -.
• Valve must not have grooves.
• No shavings must be jammed in opening - 1 -.
• If valve piston is stuck or opening - 1 - is plugged, there will possibly be no actuation.
Checking brass sleeves of stator shaft for wear
- Check contact surfaces of brass sleeves - arrows - at inside of stator shaft for wear.
• Contact surfaces must not be heavily scored and/or show blue discoloration.
In case of deep grooves and/or blue color:
- Replace stator shaft.
If no blue discoloration and only small grooves are detected, proceed as follows:
- Sandpaper (600 grit, oiled) contact surface 1 to 2 times.
- Carefully wipe off with a clean rag and check contact surface.
• Contact surfaces must now be like new.
If scores cannot be removed in this manner:
- Replace stator shaft.
Checking rectangular rings item - 16 - for wear
• Always replace rectangular rings. However, conclusions can be drawn from the signs of wear of the rectangular rings regarding the quality of contact surface for rectangular rings. Evaluating the rectangular rings for wear is therefore essential.
If rectangular rings show strong axial wear of more than 0.3 mm - arrow 1 - (slight wear of outer edges is normal):
- Replace stator shaft.
If rectangular rings show strong radial wear of more than 0.3 mm - arrow 2 - (for comparison, measure thickness of new rectangular ring):
- Replace cylinder "B".
Checking rectangular ring item - 17 - for wear
• Always replace rectangular ring. However, conclusions can be drawn from the signs of wear of the rectangular ring regarding the quality of contact surface for rectangular rings. Evaluating the rectangular ring for wear is therefore essential.
If rectangular ring shows strong axial wear of more than 0.3 mm - arrow 1 - (slight wear of outer edges is normal):
- Replace stator shaft.
If rectangular ring shows strong radial wear of more than 0.3 mm - arrow 2 - (for comparison, measure thickness of new rectangular ring):
- Replace cylinder "A".