Valve Train Overview

Fig 1: Identifying Valvetrain, Assembly Overview

Courtesy of AUDI OF AMERICA, LLC

1. Mounting Pins or Input Shaft
   • Vehicles without mechanical vacuum pump: mounting pins for th drive chain sprocket.
   • Vehicles with mechanical vacuum pump: driveshaft for mechanical vacuum pump.
2. High Pressure Pump Drive Chain Sprocket
   • Different versions
3. Valve Stem Seal
   • Replacing, refer to VALVE STEM SEALS, REMOVING AND INSTALLING .
4. Valve Spring
   • The larger diameter faces toward the cylinder head.
5. Valve Spring Retainer
6. Valve Retainer
7. Bolt
   • 8 Nm
8. Control Housing
   • Removing and Installing, refer to CAMSHAFTS, REMOVING AND INSTALLING .
   • Check the control housing strainer for soiling before Installation, refer to Fig 8.
   • When Installation, lightly lubricate compression ring contact surface in control housing.
   • Disassembling and Assembling, refer to Fig 7.
9. Flat Ring
   • 3 per camshaft
   • Replace if leaking.
   • When replacing compression rings, do not spread too widely.
   • Install with gaps offset 120°
   • when Installation, lightly lubricate compression ring contact surface at camshafts and carefully slide control housing -item 8- over compression ring.
10. Nut
    • Exhaust camshaft tightening sequence, refer to Fig 6.
    • Intake camshaft tightening sequence, refer to Fig 5.
11. Bearing Cap
    • Installed position, refer to Fig 4.
    • Installation order, refer to Fig 4.
12. Intake Camshaft
    • Identification, refer to Fig 2.
    • Removing and Installing, refer to CAMSHAFTS, REMOVING AND INSTALLING .
    • Axial Play, Measuring, refer to CAMSHAFT, MEASURING AXIAL CLEARANCE .
    • Radial Play, Measuring, refer to CAMSHAFT, MEASURING RADIAL CLEARANCE .
    • Run-out maximum 0.01 mm
13. Exhaust Camshaft
    • Identification, refer to Fig 2.
    • Removing and Installing, refer to CAMSHAFTS, REMOVING AND INSTALLING .
    • Axial Play, Measuring, refer to CAMSHAFT, MEASURING AXIAL CLEARANCE .
    • Radial Play, Measuring, refer to CAMSHAFT, MEASURING RADIAL CLEARANCE .
    • Run-out maximum 0.01 mm
14. Roller Rocker Lever
    • Do not interchange.
    • Check roller bearing.
    • Check the axial play in the camshafts before Installation, refer to CAMSHAFT, MEASURING AXIAL CLEARANCE .
    • Lubricate contact surface.
    • for assembly, clip with to support element with securing clip -item 15-.
15. Clip
    • Make sure it is secure.
16. Support
    • With hydraulic valve clearance compensation.
    • Do not interchange.
    • Check the axial play in the camshafts before Installation, refer to CAMSHAFT, MEASURING AXIAL CLEARANCE .
    • Lubricate contact surface.
17. Cylinder Head
    • Valve Guides, Checking, refer to VALVE GUIDES, CHECKING .
    • Valve Seats, Reworking, refer to VALVE SEATS, REWORKING .
18. Intake Valve
    • Do not rework, only grinding is permitted.
    • Valve dimensions, refer to VALVE DIMENSIONS .
    • Valve Guides, Checking, refer to VALVE GUIDES, CHECKING .
    • Valve Seats, Reworking, refer to VALVE SEATS, REWORKING .
19. Exhaust Valve
    • Do not rework, only grinding is permitted.
    • Valve dimensions, refer to VALVE DIMENSIONS .
    • Valve Guides, Checking, refer to VALVE GUIDES, CHECKING .
    • Valve Seats, Reworking, refer to VALVE SEATS, REWORKING .

Fig 2: Camshaft Identification, Valve Timing

Courtesy of AUDI OF AMERICA, LLC

The camshaft marking is located between cylinder 4 and 5 cam pair.

A -

Exhaust camshaft; Identification 022 - Index 101

B -

Intake camshaft; Identification 022 - Index 102

Fig 3: Coating Bearing Caps 7 And 8 Contact Surface With Adhesive Lubricating Paste

Courtesy of AUDI OF AMERICA, LLC

-- Coat contact surface -shaded- on bearing cap 7 and 8 with adhesive lubricating paste; adhesive lubricating paste.

Fig 4: Identifying Points Of Intake And Exhaust Camshaft Bearing Cap Face Outwards

Courtesy of AUDI OF AMERICA, LLC

• Points -arrow A- of intake and exhaust camshaft bearing caps face outwards.
• Identification on bearing caps is legible when read from intake side.

Fig 5: Camshafts - Tightening Specifications And Tightening Sequence

Courtesy of AUDI OF AMERICA, LLC

-- Tighten nuts in 5 stages as follows:

1. Install bearing cap 5 and 9 nuts alternately and in a diagonal sequence as far as the stop.
2. Tighten the bearing cap nuts 5 and 9 to 5 Nm plus an additional 45° (¹ /₈ turn).
3. Tighten the bearing cap nuts 1 and 13 to 5 Nm plus an additional 45° (¹ /₈ turn).
4. Tighten the bearing cap nuts 7 to 5 Nm plus an additional 45° (¹ /₈ turn).
5. Tighten the bearing cap nuts 3 and 11 to 5 Nm plus an additional 45° (¹ /₈ turn).

Fig 6: Camshafts - Tightening Specifications And Tightening Sequence

Courtesy of AUDI OF AMERICA, LLC

-- Tighten nuts in 5 stages as follows:

1. Install bearing cap 6 and 10 nuts alternately and in a diagonal sequence as far as the stop.
2. Tighten the bearing cap nuts 6 and 10 to 5 Nm plus an additional 45° (¹ /₈ turn).
3. Tighten the bearing cap nuts 2 and 14 to 5 Nm plus an additional 45° (¹ /₈ turn).
4. Tighten the bearing cap nuts 8 to 5 Nm plus an additional 45° (¹ /₈ turn).
5. Tighten the bearing cap nuts 4 and 12 to 5 Nm plus an additional 45° (¹ /₈ turn).

Fig 7: Control Housing, Assembly Overview

Courtesy of AUDI OF AMERICA, LLC

1. Guide Track, Clipped in at Control Housing
2. Control Housing
3. Camshaft Adjustment Valve 1 -N205-
4. Exhaust Camshaft Adjustment Valve 1 -N318-
5. Bolt

Fig 8: Backside Of Control Housing & Screen

Courtesy of AUDI OF AMERICA, LLC

-- Unclip screen -2- on back side of control housing -1- and remove dirt.