157019 Removing and installing cylinder head
WM 157019 Removing and installing cylinder head
Technical values
Preliminary work
Information
- If more extensive work is planned, e.g. if the entire cylinder head is to be replaced, the exhaust manifolds, fuel injectors, high-pressure pump or vacuum pump must also be removed.
1. Remove the engine. -> 100119 Removing and installing engine 100119 Removing and installing engine
2. Remove the engine and place it on the assembly support. -> 343527 Removing and mounting transmission or -> 373427 Removing and mounting Porsche Doppelkupplung (PDK) 373427 Removing and mounting Porsche Doppelkupplung (PDK) and -> 1001IN Securing engine on engine support (mounting bracket) 1001IN Securing engine on assembly support (mounting bracket)
3. Loosen the turbocharger on turbo engines. -> 213019 Removing and installing turbocharger Service and Repair
4. Remove intake-air distributor. -> 244619 Removing and installing intake-air distributor Service and Repair
5. Remove the fuel distribution pipe. -> 243019 Removing and installing fuel distribution pipe Removal and Replacement
6. Remove the timing-case cover. -> 153319 Removing and installing timing-case cover Removal and Replacement
7. Remove timing chain. -> 153519 Removing and installing timing chains Removal and Replacement
8. Remove deflector rail. -> 154719 Removing and installing guide and tensioning rails Service and Repair
9. Remove camshafts. -> 150520 Removing and installing camshafts 150520 Removing and installing camshafts
Removing cylinder head
1. Remove vent line.
1.1. Unscrew fastening screws -1-.
1.2. Unclip vent line -2- from the cable duct and remove it -arrow-.
Vent line
2. Expose the engine wire harness close to the vacuum pump. => Engine wire harness close to vacuum pump => Engine wire harness at the rear right
Engine wire harness close to vacuum pump
Engine wire harness at the rear right
3. Unclip the engine wire harness close to the high-pressure pump.
3.1. Unclip the engine wire harness at the retaining clips -arrows A-.
3.2. Unscrew the screw socket -arrow B-.
Engine wire harness close to high-pressure pump
4. Lift the wire harness up and out at the cylinder heads -arrow-
Engine wire harness
5. Remove mounting saddle at the front -8- (cylinder bank 1 to 4 shown). This hides the cylinder head screws underneath.
Camshafts, cylinder bank 1 to 4
6. Remove front M8 screw securing the cylinder head of cylinders 1 to 4 to the crankcase. -3-
Cylinder head 1 to 4
7. Remove cylinder head screws in the opposite order to the tightening sequence shown => Tightening sequence for cylinder head. Remove cylinder head. If necessary, remove the valve lifters now and lay them aside in the correct order.
Tightening sequence for cylinder head
8. Remove cylinder head gasket.
9. Remove cylinder head for cylinders 5 to 8 in the same way. => Cylinder head 5 to 8
Cylinder head 5 to 8
Installing cylinder head
Information
If cold or excessively low-tempered components are sealed to each other by applying sealant, leaks can occur because of condensed water forming or components distorting. Components must be uniformly at least => Temperature: 17°C.
Information
- All sealing surfaces must be clean and free of grease!
- It is essential to work carefully!
- Tightening sequences and tightening torques must be observed!
Information
The tightening specifications for the basic engine are stored centrally. -> 1001IN Tightening torques, tightening sequences, assembly overviews [1][2]Specifications. Tightening torques and assembly instructions for other assemblies (e.g. chassis, electrics, transmission or body) or for peripheral engine equipment can be found in the corresponding documents.
1. Replace cylinder head gasket.
2. Place cylinder head gasket correctly, i.e. according to specifications, onto the straight pins on the engine crank housing. This must be done in such a way that the marking Top' is legible -see illustration-.
Cylinder bank 1 -4
Cylinder bank 5 - 8
3. Fit cylinder head. Insert cylinder head screws (screws can be re-used). For tightening specifications, see -> 1001IN Tightening torques, tightening sequences, assembly overviews [1][2]Specifications
Cylinder head 1 to 4
Cylinder head 5 to 8
4. Fit front M8 screw to secure the cylinder head of cylinders 1 to 4 to the crankcase. -3-
Cylinder head 1 to 4
5. Fit the mounting saddle at the front -8- (cylinder bank 1 to 4 shown).
Camshafts, cylinder bank 1 to 4
6. Secure wire harness to the engine.
6.1. Position and lay engine wire harness on the engine housing -arrow-.
6.2. Tighten fastening screws.
Securing engine wire harness on engine housing
7. Clip in engine wire harness at the rear right using the retaining clip -arrow-.
Clipping in engine wire harness at the rear right
8. Clip in engine wire harness close to the vacuum pump.
8.1. Clip in engine wire harness using the retaining clip -arrow A-.
8.2. Slide engine wire harness onto the holder -arrow B-.
Clipping in engine wire harness close to the vacuum pump
9. Clip in engine wire harness close to the high-pressure pump.
9.1. Screw in and tighten the screw socket -arrow A-.
9.2. Clip in engine wire harness using the retaining clips -arrows B-.
Clipping in engine wire harness close to the high-pressure pump
10. Install vent line.
10.1. Position vent line -1- and clip it into the cable duct -arrow-.
10.2. Fit the fastening screws -2-.
Vent line
Subsequent work
1. Fit deflector rail. -> 154719 Removing and installing guide and tensioning rails Service and Repair
2. Install camshafts. -> 150520 Removing and installing camshafts 150520 Removing and installing camshafts
3. Fit timing chain. -> 153519 Removing and installing timing chains Removal and Replacement
4. Fit timing-case cover. -> 153319 Removing and installing timing-case cover Removal and Replacement
5. Set the timing. -> 150516 Setting timing for camshafts Procedures
6. Fit the fuel distributor pipe. -> 243019 Removing and installing fuel distributor pipe Removal and Replacement
7. Fit intake-air distributor. -> 244619 Removing and installing intake-air distributor Service and Repair
8. Fit the turbocharger on V8 turbo engines. -> 213019 Removing and installing turbocharger Service and Repair
9. Take the engine from the assembly support and connect it to the transmission. -> 343527 Removing and mounting transmission or -> 373427 Removing and mounting Porsche Doppelkupplung (PDK) 373427 Removing and mounting Porsche Doppelkupplung (PDK)
10. Install the engine. -> 100119 Removing and installing engine 100119 Removing and installing engine