Group 15 Cylinder Head Valve Train

WARNING: This page is about a different variant/trim than selected.

Fig 1: Valves Components Location - Naturally Aspirated Engines

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Valves, naturally aspirated engines

1	Inlet valve
2	Intake valve seat ring (intake)
3	Valve guide
4	Lower valve spring seat (intake)
5	Valve-stem seal
6	Set of valve springs (intake)
7	Upper valve spring seat (intake)
8	Valve collet
9	Upper valve spring seat (exhaust)
10	Valve spring (one exhaust valve spring)
11	Lower valve spring seat (exhaust)
12	Exhaust valve
13	Valve seat ring (exhaust)

Fig 2: Valves Components Location - Turbo Engines

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Valves, turbo engines

1	Inlet valve
2	Intake valve seat ring (intake)
3	Valve guide
4	Lower valve spring seat (intake)
5	Valve-stem seal
6	Set of valve springs (intake)
7	Upper valve spring seat (intake)
8	Valve collet
9	Upper valve spring seat (exhaust)
10	Valve spring (two exhaust valve springs for turbo engines)
11	Lower valve spring seat (exhaust)
12	Valve seat ring (exhaust)
13	Exhaust valve

Fig 3: Cylinder Head 1 To 4 Components Location With Torque Specification

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Cylinder head 1 to 4

1	Cylinder head 1 to 4
2	Cylinder-head gasket 1 to 4
3	Screw M8 > Tightening torque 23 Nm (17 ft lb.)
4	Lid
5	Stopper
6	Stopper
7	Restrictor for valve lift adjustment > Tightening torque 2 Nm (1.5 ft lb.)
8	Cylinder head screws => For tightening specifications, see Tightening sequence for cylinder head
9	Spark plug; > tightening torque 25 Nm (18.4 ft lb.) for re-installation; > tightening torque 30 Nm (22.1 ft lb.) for new installation
	Electrode gap of spark plug FGR5NQE>, check value 1.6 mm +/- 0.05 mm
	Electrode gap of spark plug FR6NPP >, check value 0.7 mm + 0.1 mm

Fig 4: Cylinder Head 5 To 8 Components Location With Torque Specification

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Cylinder head 5 to 8

1	Cylinder head 5 to 8
2	Screw plug > Tightening torque 5 Nm (3.7 ft lb.)
3	Spark plug; > tightening torque 25 Nm (18.4 ft lb.) for re-installation; > tightening torque 30 Nm (22.1 ft lb.) for new installation
4	Cylinder-head gasket 5 to 8
5	Stoppers
6	Restrictor for valve lift adjustment > Tightening torque 2 Nm (1.5 ft lb.)
7	Stoppers
8	Lid
9	Cylinder head screws => For tightening specifications, see Tightening sequence for cylinder head

Fig 5: Cylinder Head Screws Tightening Sequence With Torque Specification

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Tightening sequence for cylinder head

1 to 10

1st Adjustment torque > Tightening torque 30 Nm (22.1 ft lb.) ; 2. Adjustment torque > Tightening torque 50 Nm (36.9 ft lb.) ; 2 Loosen turns > Turning angle 720° ; 1. Passage > Tightening torque 30 Nm (22.1 ft lb.) ; 2. Passage > Tightening torque 30 Nm (22.1 ft lb.) ; 3. Passage and final tightening (torque angle) > Torque angle 110°

Fig 6: Cylinder 1 To 4 Closures Components Location With Torque Specification

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Cylinder 1 to 4 closures

1	Screw plug > Tightening torque 5 Nm (3.7 ft lb.)
2	Threaded bolt => fit with medium-strength securing liquid. Visible length 17 mm (naturally aspirated engine) and 26 mm (turbo engine) (when screwed into cylinder head)
3	Screw plug (on naturally aspirated engine instead of on turbocharger oil pipe) > Tightening torque 15 Nm (11.1 ft lb.)
4	Sealing ring
5	Sealing ring
6	Screw plug for secondary-air duct > Tightening torque 15 Nm (11.1 ft lb.)
7	Sealing ring
8	Screw plug > Tightening torque 8 Nm (5.9 ft lb.)
9	Stopper
10	Oil bearing surfaces on camshafts with engine oil

Fig 7: Catches For Cylinders 5 To 8 Components Location With Torque Specification

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Catches for cylinders 5 to 8

1	Stopper
2	Screw plug > Tightening torque 8 Nm (5.9 ft lb.)
3	Sealing ring
4	Screw plug for secondary air duct > Tightening torque 15 Nm (11.1 ft lb.)
5	Sealing ring
6	Sealing ring
7	Screw plug (on the aspirator instead of the turbocharger oil pipe) > Tightening torque 15 Nm (11.1 ft lb.)
8	Threaded bolt => fit with medium-strength securing liquid. Visible length 17 mm (naturally aspirated engine) and 26 mm (turbo engine) (when screwed into cylinder head)
9	Oil bearing surfaces on camshafts with engine oil

Fig 8: Valve Cover Gaskets Components Location With Torque Specification - Cylinders 1 To 4

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Valve cover gaskets, cylinders 1 to 4

1	Valve cover for cylinders 1 to 4 (align over rod ignition modules)
2	Oil cap
3	Aluminium screw M6 x 20; Hall sender (phase encoder); always renew aluminium screws > Initial torque 4 Nm (3 ft lb.) and > Final torque 90°
4	Hall sender
5	Sealing ring
6	Cylinder head cover gasket
7	Cylinder head cover gasket, inner
8	Seal for hydraulic valve for camshaft control

Fig 9: Valve Cover Cylinder Seals 5 To 8 Components Location With Torque Specification

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Valve cover cylinder seals 5 to 8

1	Valve cover for cylinders 5 to 8 (align over rod ignition modules)
2	Hall sender
3	Aluminium screw M6 x 20; Hall sender (phase encoder); always renew aluminium screws > Initial torque 4 Nm (3 ft lb.) and > Final torque 90°
4	Sealing ring
5	Cylinder head cover gasket
6	Cylinder head cover gasket inner
7	Seal for hydraulic valve for camshaft control

Fig 10: Valve Cover Screws Tightening Sequence - Cylinders 1 To 4

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Tightening sequence for valve cover for cylinders 1 to 4

Fig 11: Valve Cover Screws Tightening Sequence - Cylinders 5 To 4

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Tightening sequence for valve cover for cylinders 5 to 8

Fig 12: Rod Ignition Modules And Valve Cover Components Location With Torque Specification - Cylinders 1 To 4

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Rod ignition modules and valve cover for cylinders 1 to 4

1	Valve cover for cylinder bank 1 to 4 (align over rod ignition modules)
2	Rod ignition module
3	Aluminium screw M6 x 20; rod ignition module; always renew aluminium screws; > Initial torque 4 Nm (3 ft lb.) and > Final torque 90°
4	Aluminium screw M6 x 30; Rod ignition module; always renew aluminium screws; > Initial torque 4 Nm (3 ft lb.) and > Final torque 90°
5	Cover plate
6	Steel screw on eyelet > Tightening torque 23 Nm (17 ft lb.)
7	Eyelet
8	Aluminium screw M8 x 35 (to torque support); always renew aluminium screws; > Initial torque 10 Nm (7.4 ft lb.) and > Final torque 90° Steel screw to lifting eye!

Information

The eyelets must not be inadvertently secured using aluminium screws! => Aluminium screws would break off and the suspended engine would fall down!

Fig 13: Rod Ignition Modules And Valve Covers Components Location With Torque Specification - Cylinder Bank 5 To 8

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rod ignition modules and valve covers, cylinder bank 5 to 8

1	Valve cover for cylinder bank 5 to 8 (align over rod ignition modules)
2	Eyelet
3	Steel screw on eyelet > Tightening torque 23 Nm (17 ft lb.) Information The eyelets must not be inadvertently secured using aluminium screws! => Aluminium screws would break off and the suspended engine would fall down!
4	Aluminium screw M6 x 30; rod ignition module; always renew aluminium screws; > Initial torque 4 Nm (3 ft lb.) and > Final torque 90°
5	Rod ignition module
6	Aluminium screw M6 x 20; rod ignition module; always renew aluminium screws; > Initial torque 4 Nm (3 ft lb.) and > Final torque 90°
7	Sheetmetal holder
8	Cover plate

Fig 14: Camshafts Components Location With Torque Specification - Cylinder Bank 1 To 4

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Camshafts, cylinder bank 1 to 4

1	Camshaft (exhaust)
2	Camshaft (intake)
3	Hydraulic valve for variable valve lift control (VVS)
4	Screw M5 x 12 > Tightening torque 6 Nm (4.4 ft lb.)
5	Switching tappet (oil with engine oil)
6	Bucket tappet (oil with engine oil)
7	Stopper
8	Mounting saddle 1 to 4
9	Stopper
10	Bearing locations (oil with engine oil)
A	Direction of travel

Fig 15: Camshaft Mount Components Location With Torque Specification - Cylinder Bank 1 To 4

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Camshaft mount, cylinder bank 1 to 4

1	Screw M6 x 35 > Tightening torque 13 Nm (9.6 ft lb.)
2	Housing
3	Dowel sleeve
4	Housing (intake)
5	Housing (exhaust)
6	Screw M6 x 70 > Tightening torque 13 Nm (9.6 ft lb.)
7	Bearing surfaces (oil with engine oil)
A	Direction of travel

Fig 16: Camshafts Components Location With Torque Specification - Cylinders 5 To 8

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Camshafts, cylinders 5 to 8

1	Switching tappet (oil with engine oil)
2	Bucket tappet (oil with engine oil)
3	Camshaft (intake)
4	Hydraulic valve for variable valve lift control
5	Screw M5 x 12 > Tightening torque 6 Nm (4.4 ft lb.)
6	Camshaft (exhaust)
7	Stopper
8	Mounting saddle, cylinders 5 to 8
9	Stopper
10	Bearing surfaces (oil with engine oil)
A	Direction of travel

Fig 17: Camshaft Mount Components Location With Torque Specification - Cylinders 5 To 8

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Camshaft mount, cylinders 5 to 8

1	Dowel sleeves
2	Housing (intake)
3	Screw M6 x 70 > Tightening torque 13 Nm (9.6 ft lb.)
4	Housing
5	Screw M6 x 35 > Tightening torque 13 Nm (9.6 ft lb.)
6	Housing (exhaust)
7	Bearing surfaces (oil with engine oil)
A	Direction of travel

Fig 18: Camshaft Adjustment Components Location With Torque Specification

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Camshaft adjustment

1	Screw, M12 Tighten fully after setting valve timing! ; Screw must be renewed; pre-tightening 1st step > Tightening torque 10 Nm (7.4 ft lb.) ; initial tightening 2nd step > Tightening torque 30 Nm (22.1 ft lb.) ; initial tightening 3rd step (torque angle) > Torque angle 100° ; loosening process 1st step > Turning angle 90° ; loosening process 2nd step > Torque angle 360° ; final tightening 1st step > Tightening torque 30 Nm (22.1 ft lb.) ; initial tightening 2nd step (torque angle) > Torque angle 135°
2	Camshaft controller with integrated hexagon for countering
3	Hydraulic valve for camshaft adjustment (NVS)
4	Screw M5 x 12 > Tightening torque 6 Nm (4.4 ft lb.)

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Camshaft identification on V8 turbo engine

A	Cylinders 1 to 4
B	Cylinders 5 to 8
1	Exhaust camshaft identification (green)
2	Intake camshaft identification (blue)
3	Intake camshaft identification (blue)
4	Exhaust camshaft identification (green)

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Camshaft identification on V8 naturally aspirated engine

A	Cylinders 1 to 4
B	Cylinders 5 to 8
1	Exhaust camshaft identification (green)
2	Intake camshaft identification (white)
3	Intake camshaft identification (white)
4	Exhaust camshaft identification (green)

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Camshaft bearing cover identification

All markings can be read from the exhaust side/main diagram applies symmetrically for both cylinder heads

1	Matching number for cylinder head/intake camshaft housing, cylinder 1 (E1)
2	Matching number for cylinder head/bearing cover intake camshaft, cylinder 2 (E2)
3	Matching number for cylinder head/bearing cover intake camshaft, cylinder 3 (E3)
4	Matching number for cylinder head/bearing cover intake camshaft, cylinder 4 (E4)
5	Matching number for cylinder head/bearing cover exhaust camshaft camshaft, cylinder 1 (A1)
6	Matching number for cylinder head/bearing cover exhaust camshaft camshaft, cylinder 2 (A2)
7	Matching number for cylinder head/bearing cover exhaust camshaft camshaft, cylinder 3 (A3)
8	Matching number for cylinder head/bearing cover exhaust camshaft camshaft, cylinder 4 (A4)
Arrow	Direction of travel

Fig 19: Timing Chain And Sprockets Components Location With Torque Specification

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Timing chain and sprockets

1	Double-chain camshaft drive
2	Camshaft sprocket with integrated hexagon for countering
3	Screw, M12 Tighten fully after setting valve timing! ; screw must be renewed; 1st pass > tightening torque 10 Nm (7.4 ft lb.) ; 2nd pass > tightening torque 50 Nm (36.9 ft lb.) ; final tightening (torque angle) > Torque angle 90°
4	Deflector rail
5	Screw M8 x 35 > Tightening torque 32 Nm (23.6 ft lb.)
6	Camshaft-to-camshaft guide pad
A	Direction of travel

Fig 20: Oil Pump Chain Drive Components Location

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Oil pump chain drive

1	Crankshaft sprocket
2	Friction plates/diamond washers can be re-used
3	Oil pump drive chain
4	Drive in spring wedge with a plastic hammer
5	Oil pump

Fig 21: Timing Chain And Chain Guide Components Location With Torque Specification

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Timing chain and chain guide

1	Screw-on peg > Tightening torque 35 Nm (25.8 ft lb.)
2	Screw-on peg > Tightening torque 20 Nm (14.8 ft lb.)
3	Guide rail
4	Tensioning rail
5	Chain tensioner with sealing ring; always replace sealing ring > Tightening torque 60 Nm (44.3 ft lb.)
6	Pin (for locking the oil pump tension rail)
A	Direction of travel

Fig 22: Chain Housing Cover Seals Components Location

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Chain housing cover seals

1	Chain housing cover
2	Chain housing cover seal, outer right (filling openings with sealant, see 6)
3	Inner chain housing cover seal
4	Chain housing cover rib seal
5	Chain housing cover seal, outer left (filling openings with sealant, see 6)
6	Applying sealant to control chain housing; Loctite 5900 (000.043.204.35 status 10/08)

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Applying sealant (filling openings in metal seal)

1	When chain housing cover is fitted, apply sealant to joint before fitting valve covers
2	When chain housing cover is fitted, apply sealant to joint before fitting valve covers

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Applying sealant before fitting valve covers

1	When chain housing cover is fitted, apply sealant to joint before fitting valve covers
20	mm Length of sealant applied to joint

Information

In case of repair, two aluminium screws must be changed to steel screws -15 and 30- with aluminium washers -Arrows- .

>SY, 1533 ENGINE SYMPTOM - LOOSE/BROKEN SCREWS AND OIL LEAKS IN THE AREA OF THE CHAIN HOUSING COVER AND/OR CAMSHAFT PHASER (SY 210/21) .

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Steel screw with aluminium washer

Fig 23: Chain Housing Cover Screws Tightening Sequence With Torque Specification

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Tightening specifications for chain housing cover

1-30	Tightening sequence
1-4	Aluminium screw M6 x 55
5 + 6	Aluminium screw M8 x 55
7-12	Aluminium screw M6 x 30
13 + 14	Aluminium screw M6 x 55
15	Steel screw M6 x 30 with aluminium washer 6.4 x 14 x 3 mm
14-28	Aluminium screw M6 x 30
29	Aluminium screw M6 x 55
30	Steel screw M6 x 30 with aluminium washer 6.4 x 14 x 3 mm
1-4 + 7-	Aluminium screw M6 > Initial tightening 4 Nm (3 ft lb.) > Final tightening + 90° >
14 + 16- 29	Minimum torque angle + 50° > Maximum torque angle + 95° > Lower torque limit 5.2 Nm (3.8 ft lb.) > Upper torque limit 9 Nm (6.6 ft lb.)
5 + 6	Aluminium screw M8 > Initial tightening 10 Nm (7.4 ft lb.) > Final tightening + 90°
15 + 30	Steel screw M6 x 30 > Tightening torque 10 Nm (7.4 ft lb.)

Location	Description	Type	Basic value	Tolerance
Maximum offset of chain housing cover		Length	0.1 mm

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Measuring offset

Fig 24: Chain Tensioner, Joint Flange Components Location With Torque Specification

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Chain tensioner, joint flange

1	Joint flange (oil sealing lip with engine oil); align with sleeve or vibration balancer/replace
2	Aluminium screw M6 x 20; Always renew aluminium screws; > Pre-tensioning 4 Nm (3 ft lb.) and > Final tensioning 90°
3	Aluminium screw M6 x 55; Always renew aluminium screws; > Pre-tensioning 4 Nm (3 ft lb.) and > Final tensioning 90°
4	Sealing ring; always replace
5	Chain tensioner > Tightening torque 60 Nm (44.3 ft lb.)