Oil Check Valves, Replacing
Oil Check Valves, Replacing
Note:
^ If irregular valve noise occurs repeatedly during short Journeys and disappears after extended driving, the oil check valves must be replaced.
^ All cable yes which are released or cut open when removing the engine must be replaced in the same position when installing the engine.
^ Catch drained-off coolant in a clean container for re-use or disposal.
^ Replace all gaskets and seals.
Removing
- Unscrew bolts -arrows- and remove engine cover panels -A...C-.
- Remove cover above air cleaner.
- Remove noise insulation -arrows-.
- Drain coolant.
- Remove bumper.
- Move lock carrier to service position.
- Remove viscous fan (counter-hold with pin wrench 3212).
Note: Viscous fan has left-hand thread.
- Mark direction of rotation of ribbed belt.
- Loosen ribbed belt by turning to right using a 17 mm ring spanner until two holes are aligned with each other-arrow- and hold in position with mandrel 3204.
Note: Mark direction of rotation of ribbed belt. The belt can break if it runs in the opposite direction when reinstalled.
- Remove ribbed belt.
- Disconnect water hoses -1- and -2-.
- Remove coolant reservoir (arrows).
- Unplug connector for coolant level monitor.
- Remove cover panel from cylinder head cover (cylinder bank 4-6).
- Pull off hose -1- to vacuum reservoir.
- Remove air duct -arrows-.
WARNING: Fuel system is under pressure. Before opening the system, place a cloth around the connection. Then release pressure by carefully loosening the connection.
- Disconnect fuel supply line and fuel return line -1- and -2- , and move fuel lines clear.
- Pull hose off EVAP valve -3-.
- Fit clamp (special tool 3094) on hose from power steering reservoir to power steering pump.
- Disconnect power steering hose -arrow-.
- Release hose clamp -arrow-.
- Remove intake pipe-1-.
Note:
^ All hose connections are secured with clips.
^ Charge air system must be free of leaks.
^ Replace all seals and gaskets.
- Unplug connector from air recirculation valve -2-.
- Unplug connector for camshaft timing control -1- (cylinder bank 4..6).
- Unplug connectors from injectors -2 (cylinder bank 4..6).
- Pull crankcase breather -4- off cylinder head cover (cylinder bank 4..6).
- Unplug connectors from injectors -2- (cylinder bank 1..3).
- Pull off hose -5- going to turbocharger intake side.
- Unclip solenoid valve for charge pressure control -1-.
- Pull connector off EVAP valve -2-.
- Pull connector off throttle unit -1-.
- Pull connector off charge air sensor -2
- Pull off crankcase breather -3-.
- Pull connector off intake air temperature sender-4-.
- Remove pressure pipes-1-.
Note: Observe position of retaining strips -2-.
- Remove tensioner -1- for ribbed belt.
- Remove toothed belt guards -2- (left and right).
- Remove toothed belt guard -3(center).
- Turn crankshaft TDC by hand. Marks-A- and -B- must be aligned.
Note: Turn over the engine at the central bolt on the crankshaft..
- Check position of camshafts: larger holes in securing plates on camshaft sprockets must align opposite one another on inside. If not, turn crankshaft one revolution further.
- Remove sealing plug from cylinder block, left.
TDC drilling in crankshaft must be visible (or able to be felt) in line with sealing plug hole.
- Screw clamping bolt 3242 for crankshaft into sealing plug hole and tighten.
Note:
^ Mark the direction of rotation of the toothed belt with chalk or felt pen before removing. A used belt can break if it rotates in the wrong direction when refitted.
^ The toothed belt tensioning element is oil damped and can therefore only be compressed slowly by applying constant pressure.
- Using a hex key, turn toothed belt tensioning roller-1- clockwise 8 mm in direction of arrow until tensioning lever -2- compresses tensioning element -3- sufficiently to enable special tool T 400 11 to be fitted in drilling and in plunger.
- Insert special tool T 400 11 and release toothed belt tensioning roller.
- Insert camshaft clamp 3391 in securing plates of two camshafts.
- Loosen both camshaft bolts and unscrew approximately 5 turns.
- Take out camshaft clamp 3391.
- Pull off both camshaft sprockets with special tool T40001.
- Unbolt rear left toothed belt guard -arrows-.
- Detach intake manifold using special tool 3249.
- Unbolt cylinder head lifting bracket with coolant pipe -arrows- from cylinder head.
- Unbolt coolant pipe at front of cylinder head -arrows- and remove.
- Remove water pipe and auxiliary water pump.
- Remove cover on oil check valves.
- Replace oil check valves -1- (25 Nm).
Note: The oil distribution pipe -2- for the spray jets for piston cooling is also located in the opening.
Installing
Install in the opposite order to removing. When installing, note the following points:
- Install lock carrier.
- Install bumper.
- Fill with coolant.
Tightening Torques (Part 3 Of 9):
Tightening Torques (Part 4 Of 9):
Tightening Torques