Charge pressure system with exhaust turbocharger, servicing Page 1 of 22
21-44
Charge pressure system with
exhaust turbocharger,
servicing
Rules for cleanliness
When working on the exhaust gas turbocharger,
pay careful attention to the following 5 rules:
Thoroughly clean all unions and the adjacent
areas before disconnecting.
Place removed parts on a clean surface and
cover. Use lint-free cloths.
Carefully cover or seal open components if
repairs cannot be carried out immediately.
Only install clean components: Only remove
replacement parts from packaging immediately
prior to installation. Do not use parts that have
been stored loose (e.g. in tool boxes etc.).
When the system is open: Do not work with
compressed air if this can be avoided. Do not
move vehicle unless absolutely necessary.
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Turbocharger, removing and installing -
Overview
Part I
1 -
30 Nm
Only use original bolt
Parts Catalog
2 -
Gasket
Always replace
3 -
Catalytic converter
4 -
30 Nm
Always replace
5 -
30 Nm
6 -
35 Nm
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7 -
Oil supply line
Tighten union nut to 23 Nm
From oil filter bracket -Item 24 -, Page
17-10
8 -
3.5 Nm
9 -
Heat shield
10 -
23 Nm
11 -
Exhaust manifold
Removing and installing Page 26-21
12 -
35 Nm
Always replace
Coat thread and head attachment area with
high temperature lubricant G 052 112 A3
13 -
10 Nm
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14 -
Banjo bolt - 30 Nm
15 -
Gasket
Always replace
Note installation position
16 -
Coolant return line
Tighten union nut to 30 Nm
17 -
30 Nm
Always replace
18 -
Gasket
Always replace
Note installation position
19 -
Banjo bolt - 35 Nm
20 -
Coolant supply hose/line
21 -
Banjo bolt - 35 Nm
Apply D 000 600 when installing
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22 -
10 Nm
Apply D 000 600 when installing
23 -
Gasket
Always replace
24 -
Oil return line
To oil pan
25 -
Gasket
Always replace
26 -
10 Nm
27 -
10 Nm
28 -
Turbocharger
Checking Page 21-8
29 -
25 Nm
30 -
Bracket
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Part II
1 -
Vacuum hose
To Recirculatiing valve for turbocharger -
N249-
2 -
Recirculating valve
Checking Page 21-24
3 -
Hose
To recirculating valve
4 -
Air duct hose
To connection on turbocharger
5 -
Hose
To ACF valve
6 -
line
To crankcase vent
7 -
10 Nm
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8 -
Hose
To crankcase breather line
9 -
Pressure regulating valve
For crankcase breather
10 -
Hose
To turbocharger
11 -
Hose
To vacuum unit for charge pressure
regulating valve
12 -
Wastegate Bypass Regulator valve -N75-
13 -
Angled connector
14 -
Hose
To turbocharger
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Turbocharger, removing and installing
Special tools and equipment
Hose clamps 3094
Removing
- Remove sound insulation -arrows-.
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- Loosen bolts securing ribbed belt tensioning roller for A/C compressor -
arrows-. Loosen belt and remove.
CAUTION!
The air conditioner refrigerant circuit must not be opened.
- Disconnect A/C compressor from bracket and secure to body with wire.
- Remove bracket for exhaust turbocharger -2-.
- Unscrew oil return line -1- from exhaust turbocharger and set aside.
- Loosen air duct hoses -4- and -5- on exhaust turbocharger.
- Remove banjo bolt -3- for pressure line.
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- Remove engine cover -arrows-.
- Remove air filter cover -arrow-.
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- Remove bolts -arrows-.
- Remove air duct -1- and -2-.
- Disconnect wiring connectors as follows:
1 - on ACF valve (in addition, remove ACF valve from air filter housing)
2 - on mass air flow sensor
3 - on Wastegate Bypass Regulator valve -N75-
- Move wiring aside and remove air filter housing -arrows-.
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- Remove secondary air inlet line by disconnecting hoses -arrows- and
removing bolts -1-.
- Remove right-hand heat shield on cylinder head.
- Remove hose of vacuum unit for wastegate bypass regulator valve -
N75- on exhaust turbocharger.
- Unbutton sleeve on coolant return hose.
- Clamp coolant return hose to exhaust turbocharger with hose clamp
3094.
- Loosen hose clamp -4- and remove coolant return hose from exhaust
turbocharger line.
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- Loosen bolts -1- and -3- of oil feed line.
- Remove oil feed line -5- at exhaust turbocharger.
Note:
The isolating element in the exhaust system must not be bent more than
10 or it may be damaged.
- Remove catalytic converter from exhaust turbocharger -6-.
- Remove exhaust turbocharger from exhaust manifold -2-.
- Swivel exhaust turbocharger to side, loosen mounting angle and banjo
bolt of coolant feed line on exhaust turbocharger.
- Remove exhaust turbocharger.
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Installing
Installation is carried out in the reverse order of
removal; note the following:
Note:
All cable ties which are released or cut open
when removing must be installed in the same
position when installing.
Secure all hose connections with the correct
hose clips (same as original equipment):
Parts Catalog
The hose connectors and hoses must be free of
oil and grease before assembling.
Always replace seals, gaskets and self-locking
nuts.
- Perform following operating steps before
tightening exhaust turbocharger:
-
Fasten coolant feed line loosely to bracket on
vacuum unit for wastegate bypass regulator
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Charge pressure system with exhaust turbocharger, servicing Page 15 of 22
valve.
- Tighten banjo bolt to 35 Nm and then tighten
securing bolt of bracket to 10 Nm.
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Note:
Fill the exhaust turbocharger with engine oil via
the oil supply connection.
- Install ribbed belt for A/C compressor Page
13-20 .
- Top up coolant Page 19-7 .
- Check oil level Page 17-35 .
Note:
After installing the turbocharger, run engine for
approx. 1 minute at idling speed; do not rev. up
immediately. This ensures the turbocharger is
properly lubricated.
Tightening torques
Component Nm
Coolant feed line to exhaust turbocharger
35
Bracket for coolant feed line to exhaust
turbocharger
10
Turbocharger to exhaust manifold
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Charge pressure system with exhaust turbocharger, servicing Page 17 of 22
35 1)
2)
1)
Replace bolts
2)
Coat thread and head attachment area with
high temperature lubricant G 052 112 A3
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Charge pressure system with exhaust turbocharger, servicing Page 18 of 22
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Component Nm
Turbocharger bracket to cylinder block 25
Turbocharger bracket to turbocharger 30
Catalytic converter to exhaust 30
turbocharger
Oil return line to turbocharger 10
Oil supply line to turbocharger 23
Bracket for oil feed line to cylinder head 23
Heat shield to line for secondary air inlet
3.5
Hose clamps for coolant hoses 2
Hose clamps for air duct hoses 3.5
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Charge air cooling system components,
removing and installing
Note:
Secure all hose connections with the correct
hose clips (same as original equipment):
Parts Catalog
Before a check or repair all hoses and lines
must be checked for correct seating and leaks.
1 -
Air duct
2 -
Rubber grommet
3 -
Hose
Between charge air cooler and air ducting
in front apron
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4 -
Air duct hose
Between intake manifold and charge air
cooler (intercooler)
5 -
O-ring
Replace, if damaged
6 -
Charge Air Pressure sensor -G31-
7 -
3 Nm
8 -
Rubber grommet
9 -
Bracket
Riveted to body
10 -
Rubber grommet
11 -
Charge air cooler
Removing and installing Page 21-62
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Charge air cooler (intercooler),
removing and installing
Removing
Lock carrier must be in service position
Page 13-1 .
- Remove air duct hose -1-.
- Disconnect connector -2- at Charge Air Pressure sensor -G31-.
- Remove air cowl in front of charge air cooler -arrows-.
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- Remove lower air duct hose to charge air
cooler.
- Take out charge air cooler from underneath.
Installing
Installation is carried out in the reverse order of
removal; note the following:
- Install lock carrier Page 13-1 .
Tightening torque
Component Nm
Hose clamps for air duct hoses
3.5
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