Oil Pan: Service and Repair
WM 175019 Removing and installing oil pan
Tools
Technical values
Preliminary work
WARNING
Hot fluid
- Danger of scalding
-> Let the fluid cool down.
-> Wear personal protective gear.
Information
Specifications for wrench sizes (a/f specifications) for screw heads are described as follows:
- Torx screws: (E.) for external Torx, (T.) for internal Torx.
- Hexagon-head bolts (internal and external hexagon): Wrench size (a/f)
1. Drain engine oil.
=> 170155 Changing engine oil and oil filter.
2. Drain coolant.
=> 193817 Draining and filling coolant (includes bleeding the system).
Information
- Grease O-rings, hoses and lines in the cooling system with Kluber plus Gel (Part No. 000.043.205.93).
3. Remove coolant guide -1- for the coolant pump.
3.1. Unscrew six external Torx screws (E10, M6 x 25) -2- and remove coolant guide.
3.2. Collect the remaining emerging coolant.
3.3. Clean moulded seals and coat with Kluber plus Gel.
Only replace moulded seals if they are damaged.
Lower coolant guide
Removal
Removing oil pan (lower part)
NOTICE
Dirt and contamination
- Risk of damage to units or components
-> Protect components from dirt and contamination.
-> Clean or replace dirty components.
1. Remove lower part of oil pan.
1.1. Unscrew 23 inner Torx screws (T30) M6 x 25.
Screws on lower part of oil pan
2. Remove the oil pan.
2.1. Check moulded seal and replace it if necessary. Replace O-rings on the sprue cones.
Moulded seal and O-rings for lower part of oil pan
3. Clean and degrease sealing faces (using solvent naphtha or metal cleaner for example). Allow parts to dry off well.
Removing oil pan (upper part)
NOTICE
Dirt and contamination
- Risk of damage to units or components
-> Protect components from dirt and contamination.
-> Clean or replace dirty components.
1. Remove joint flange for oil regulating valve.
1.1. Pull off cable plug.
1.2. Unscrew two outer Torx screws (E10) M6 x 20.
1.3. Replace O-ring.
Joint flange for oil regulating valve
2. Remove oil pressure pipe.
2.1. Unscrew three outer Torx screws (E10) M6 x 16.
2.2. Pull out pressure pipe and replace O-ring on the pipe and on the oil pump.
Oil pressure pipe for oil pan
3. Remove air/oil separator.
3.1. Unscrew five outer Torx screws (E10) M6 x 20. Move the separator and line into vertical position at the belt side and then pull out the connecting line at the oil pump.
3.2. Replace O-ring on the line going to the oil pump.
Oil/air separator on oil pan
4. Remove suction tube and oil deflector (watertight sheetmetal panel).
4.1. Unscrew one inner Torx screw (T30) M6 x 25 and pull suction tube out of the oil pump. Replace O-ring.
4.2. Unscrew one outer Torx screw (E10) M6 x 20 and pull off the oil deflector. Replace two O-rings.
Suction tube and oil deflector
5. Remove oil pressure control valve.
=> 172619 Removing and installing oil pressure control valve.
Oil pressure control valve
5.1. Unscrew cap screw (M36 x 1.0 x 12) using special tool socket-wrench insert 9753.
Oil pressure control valve with special tool
5.2. Pull valve using relay puller 9235 if necessary.
6. Remove upper part of oil pan.
6.1. Unscrew 11 inner Torx screws (T30) M6 x 25.
6.2. Unscrew 10 inner Torx screws (T30) M6 x 25.
Screws on upper part of oil pan
7. Lift up upper part and turn it clockwise until it can be lifted up over the oil pump.
7.1. Be careful with the moulded seal - check this and replace it if necessary.
7.2. Clean and degrease sealing faces (using solvent naphtha or metal cleaner for example). Allow parts to dry off well.
Installation
Installing oil pan (upper part)
1. Fit and position upper part of oil pan.
1.1. Check that the moulded seal is seated correctly.
1.2. Screw in and tighten 21 inner Torx screws (T30) M6 x 25.
1.3. Tighten screws according to tightening specifications. Screws 1-4 must be re-tightened.
=> Tightening torque: 13 Nm (9.5 ftlb.)
Upper part of oil pan
2. Install oil pressure control valve.
=> 172619 Removing and installing oil pressure control valve.
2.1. Tighten cap screw (M36 x 1.0 x 12) using special tool socket-wrench insert 9753.
Oil pressure control valve
=> Tightening torque: 40 Nm (30 ftlb.)
3. Install suction tube and oil deflector (watertight sheetmetal panel).
3.1. Fit oil deflector with new O-rings and secure in place with an outer Torx screw (E10) M6 x 20.
3.2. Fit suction tube with a new O-ring on the oil pump and secure with an inner Torx screw (T30) M6 x 25.
=> Tightening torque: 13 Nm (9.5 ftlb.)
Suction tube and oil deflector
4. Install air/oil separator.
4.1. Fit line with a new O-ring in vertical position into the oil pump and then turn it towards the upper part of the oil pan until the separator is positioned (horizontally) at the screw points.
4.2. Fit and tighten five outer Torx screws (E10) M6 x 20. Also tighten one outer Torx screw for the oil deflector.
=> Tightening torque: 13 Nm (9.5 ftlb.)
Oil/air separator on oil pan
5. Fit oil pressure pipe.
5.1. Place new O-ring on the oil pump. Attach pressure pipe with new O-ring to the crankcase and fit it on the oil pump.
5.2. Fit and tighten three outer Torx screws (E10) M6 x 16.
Oil pressure pipe for oil pan
=> Tightening torque: 13 Nm (9.5 ftlb.)
Installing oil pan (lower part)
1. Fit moulded seal on the lower part of the oil pan and fit O-rings on the sprue cones.
Moulded seal and O-rings for lower part of oil pan
2. Fit lower part of oil pan.
2.1. Fit lower part of oil pan and check that the seal is seated correctly.
2.2. Screw in 23 inner Torx screws (T30) M6 x 25.
2.3. Screw in and tighten screws evenly according to tightening specifications => Lower part of oil pan. Screws 1, 2, 5 and 6 must be re-tightened.
=> Tightening torque: 13 Nm (9.5 ftlb.)
Lower part of oil pan
Subsequent work
1. Install coolant guide -1-.
1.1. Fit and tighten six external Torx screws (E10, M6 x 25) -2- uniformly.
=> Tightening torque: 13 Nm (9.5 ftlb.)
Lower coolant guide
2. Fill in coolant and bleed the cooling system.
=> 193817 Draining and filling coolant (includes bleeding the system).
3. Fill in engine oil.
=> 170155 Changing engine oil and oil filter.
4. Start the engine and let it heat up until the operating temperature is reached (oil temperature is at least 80° C). The oil temperature and oil pressure can be checked using the PIWIS Tester 9718.
4.1. Inspect the oil pan for leaks.
4.2. Check oil level.
=> 170101 Checking engine-oil level.
4.3. Check oil pressure.
=> 170301 Checking oil pressure.