11 12 800 Cleaning cylinder heat intake channels and intake plenum (N47, N57)
Special tools required:
Necessary preliminary tasks:
- Disconnect NEGATIVE BATTERY LEAD
- Remove intake plenum. See 11 61 550 REMOVING AND INSTALLING/REPLACING AIR INTAKE PLENUM (N47 D20 O1) .
- Remove electric fan if necessary. See 17 11 035 REMOVING AND INSTALLING/REPLACING FAN COWL WITH ELECTRIC FAN (N47 D20 O1, B47) .
- Remove underbody protection. See 51 47 490 REMOVING AND INSTALLING/REPLACING FRONT UNDERBODY PROTECTION or 51 47 491 REMOVING AND INSTALLING/REPLACING REAR UNDERBODY PROTECTION .
- Remove stiffening plate if necessary
Cleaning intake plenum:
Wear safety goggles and protective gloves.
Dismantle intake plenum (remove exhaust-gas recirculation valve, throttle valve, swirl-flap controller, preheating control unit and charging pressure sensor if necessary).
Prepare cleaning bath with 1 part BMW UNIVERSAL CLEANER (see Section 3.2) and 2 parts water.
Place intake plenum in cleaning bath. Leave to soak at least 1 hr.
Crank engine to cylinder no. 1 TDC setting:
Crank engine with special tool 11 6 480 to TDC firing position of cylinder no. 1.
Remove protective cap of gear case cover.
Crank engine at central bolt with special tool 11 6 480
Use special tool 11 5 320 to block the crankshaft in the TDC firing position Cylinder 1.
Special tool 11 6 480 must be removed before starting engine.
The cam on the intake camshaft (E) points obliquely upwards at cylinder No. 1.
The cam on the exhaust camshaft (A) points obliquely outward to the left at cylinder No. 1.
Cam (2) on exhaust camshaft points obliquely outward to the left at cylinder No. 1.
Figure N47.
Cleaning intake ports:
When cleaning the intake ports, it must be ensured that the intake valves of the corresponding cylinder are closed.
Start with the 1st cylinder when cleaning the intake ports.
The following are required:
- Blasting tool 81 29 2 208 034
- Walnut shell granulate
- Vacuum cleaner
During the blasting process, only pull the wands out of the vacuum adapter until the mark becomes visible.
Blasting wand for swirl ports:
Vacuum adapter for tangential swirl port:
- 2 356 966
Vacuum adapter for swirl port:
- 2 356 967
Open blasting tool (1) and pour in 2 liters of granulate (2).
Close the device again.
Close main valve (1) on blasting tool (2).
Connect compressed air (3).
Cleaning the swirl port of 1st cylinder:
Prior to the blasting process, clean the front area of both intake ports (1) of first cylinder with a suitable tool (e.g. plastic scraper, brushes 83 19 2 298 237).
Screw together blasting wand 2 356 969 (1) and actuator (2).
Open blasting tool and pour in 2 l granulate.
Close the device again.
In stage one, only compressed air flows through the blasting wand.
In stage two (operation is fully pressed), granulate is added (blasting process).
Connect vacuum adapter 2 356 967 to vacuum cleaner. Hold vacuum adapter 2 356 967 against swirl port at no. 1 cylinder.
Open the main valve on the blasting tool and switch the vacuum cleaner on.
Risk of damage!
Second person required to assist.
Blasting wand may only be pulled out until the mark becomes visible.
Wear safety goggles.
Insert blasting wand 2 356 969 into adapter 2 356 967.
Open the actuator valve (1).
Slide locking lever (1) to the front in direction of arrow.
Operate compressed-air valve (2) at stage one; compressed air can now flow in.
Fully operate valve (3) at stage two; walnut shell granulate is now injected.
Clean intake port, rotating the blasting wand and moving it vertically up and down.
Blasting wand may only be pulled out until the mark becomes visible.
When you notice that the container is becoming empty, continue operation for at least 10 seconds at stage one in order to swirl up and draw off the remaining granulate.
Close operation valve. Close main valve, check pressure drop at the pressure gauge.
Evaluate result if necessary.
If necessary, repeat procedure.
Cleaning the tangential swirl port of 1st cylinder:
Open blasting tool and pour in 2 l granulate.
Close the device again.
Connect vacuum adapter 2 356 966 to vacuum cleaner. Hold vacuum adapter 2 356 966 on swirl port of first cylinder.
Open the main valve on the blasting tool and switch the vacuum cleaner on.
Risk of damage!
Second person required to assist.
Blasting wand may only be pulled out until the mark becomes visible.
Wear safety goggles.
Insert blasting wand 2 356 969 into adapter 2 356 966.
Open the actuator valve (1).
Slide locking lever (1) to the front in direction of arrow.
Operate compressed-air valve (2) at stage one; compressed air can now flow in.
Fully operate valve (3) at stage two; walnut shell granulate is now injected.
Clean intake port, rotating the blasting wand and moving it vertically up and down.
Blasting wand may only be pulled out until the mark becomes visible.
When you notice that the container is becoming empty, continue operation for at least 10 seconds at stage one in order to swirl up and draw off the remaining granulate.
Close operation valve. Close main valve, check pressure drop at the pressure gauge.
Evaluate result if necessary.
If necessary, repeat procedure.
Cleaning the other cylinders:
Remove special tool for securing the crankshaft.
Proceed in the standard firing order while using the same procedure to clean the swirl ports at the remaining cylinders.
Firing order:
- 1 3 4 2 (4-cylinder engine)
- 1 5 3 6 2 4 (6-cylinder engine)
During this process, crank engine at central bolt with 00 9 120 and 11 6 480 by 180° (4-cylinder engine) or 120° (6-cylinder engine).
Cleaning intake plenum:
Wear safety goggles and protective gloves.
Remove the intake plenum from the cleaning bath.
Clean plenum openings and swirl flaps with brush set (1) part number: 83 19 2 298 237.
Clean throttle valve, exhaust-gas recirculation valve, mixing tube and add-on parts with brush set if necessary.
Parts: Replace all gaskets.
Then clean the plenum with a parts washer or a high-pressure cleaner.
Observe country-specific waste disposal regulations.
Crank motor at central bolt at least twice.
Assemble engine.
Clear diagnostic fault entries from fault memory.