Camshafts, removing and installing
WARNING: This page is about a different car, the 2008 Audi RS 4 and 2007 Audi RS 4. However, it is still accessible from the selected car via links, so may be relevant.
Special tools, testers and auxiliary items required
- Multi-point socket T10035
- Impact Puller T10133/3
- Adapter T40058
- Guide frame securing pins T40116
- Hand drill with plastic brush attachment
- Protective glasses
- Sealant
NOTE:
- Here, removal and installation at left cylinder head is depicted in the following description.
Removing
- Remove engine → Engine, removing .
- Leave engine with transmission installed on scissor lift platform VAS 6131.
- Remove camshaft timing chains from camshafts → Camshaft timing chains, removing from camshafts .
- Disconnect electrical connector at intake camshaft position sensor - arrow -.
- Remove high-pressure pump → 24 - MULTIPORT FUEL INJECTION (MFI) .
- Remove Crankshaft Holder 3242 from upper part of oil pan.
CAUTION:
To prevent valves from contacting pistons during the following steps, crankshaft must be turned so that no pistons are in "TDC" position.
- Insert guide pin of adapter T40058 so that large diameter - arrow 1 - points to adapter. Small diameter - arrow 2 - points to engine.
Fig 5: Rotating Crankshaft With Socket T40058 Opposite Engine Rotation Direction 40 ° Out Of "TDC" Position
- Rotate crankshaft with Socket T40058 opposite engine rotation direction 40 ° out of "TDC" position - arrow -.
- Remove Camshaft Clamp T40070 at left cylinder head.
- Loosen guide frame bolts in sequence - 24 to 1 -.
NOTE:
- Proceed in the same way with right guide frame.
- Carefully remove guide frame.
- Mark camshafts and remove them.
CAUTION:
On engines equipped with guide frame alignment pins - arrows
- , these must be driven out with a cotter pin driver.
Installing
NOTE:
- Always replace gaskets and seals.
CAUTION:
Wear safety glasses.
- Remove sealant residue on cylinder head and guide frame, e.g. with rotating plastic brush.
CAUTION:
Make sure that no sealant residue enters the cylinder head and bearings.
- Clean sealing surfaces, they must be free of oil and grease.
- Oil journal surfaces of camshafts.
- Place camshafts in cylinder head, note position of camshafts so that guide frame can be installed without tension.
Left cylinder head:
- Intake camshaft
- Exhaust camshaft
- Groove on end of shaft must lie as shown in illustration.
Right cylinder head:
- Exhaust camshaft
- Intake camshaft
- Groove on end of shaft must lie as shown in illustration.
Continued for both sides:
- Check location of compression ring ends.
- The compression ring ends - 1 - and - 2 - must face upward or downward, and must never face sideways.
- Cut off nozzle on tube of sealant at front mark (dia. of nozzle approx. 2 mm).
Fig 13: Laying New Seal In Guide Frame Groove & Applying Sealant Beads On Clean Guide Frame Sealing Surfaces
- Lay a new seal - 2 - in guide frame groove.
- Apply sealant beads - 1, 3, 4 - on clean guide frame sealing surfaces as shown in illustration.
- Thickness of sealant beads: 2.5 mm.
NOTE:
- Sealant beads must not be thicker than specified, otherwise extra sealant can enter camshaft bearing.
- Immediately place guide frame on cylinder head.
- Insert Guide Frame Securing Pins T40116 in guide frame and cylinder head.
NOTE:
- Placing the guide frame in place and tightening it should occur without interruption, since the sealant begins to harden immediately.
- After installing guide frame, sealant must dry for approx. 30 minutes.
- Hand-tighten guide frame bolts equally, in sequence - 1 to 24 -.
- Fasten guide frame bolts in sequence - 24 to 1 - until they stop.
- Drive sealing plugs - arrows - in flush.
- Remove Guide Frame Securing Pins T40116 with Impact Puller T10133/3.
Fig 18: Rotating Intake Camshaft To "TDC" And Locating Camshaft Adjuster Screw On Camshaft With A Socket SW 24 Inserted Between
- Rotate intake camshaft to "TDC" and tighten camshaft adjuster screw - 2 - on camshaft with a socket SW 24 - 1 - inserted between.
NOTE:
- To tighten bolt, counter hold socket with pliers if necessary.
- Position a lever or ratchet with Socket T10035 on bolt and rotate camshaft until threaded holes for Camshaft Clamp T40070 face up.
- Next, loosely fasten Camshaft Clamp T40070 to intake camshaft.
- The camshaft locating tool T40070 is correctly positioned when holes for cylinder head bolts remain free.
- Adapt camshaft adjuster screw - 2 - and socket 24 - 1 - to exhaust camshaft.
- Rotate exhaust camshaft until threaded hole for Camshaft Clamp T40070 faces up.
- At the same time, position a counter-hole SW 24 on Camshaft Clamp T40070 and swing Camshaft Clamp T40070 against exhaust camshaft to install - arrow -.
- Tighten Camshaft Clamp T40070 by hand onto exhaust camshaft to avoid damaging threads (2nd technician needed).
- Tighten Camshaft Clamp T40070 bolts to 25 Nm.
- Using Socket T40058 , rotate crankshaft in direction of engine rotation - arrow - to "TDC".
CAUTION:
Do not turn crankshaft while touching "TDC" hole with finger - Risk of injury.
- Install crankshaft holder 3242 into hole to 20 Nm, if necessary rotate crankshaft very slightly back and forth to completely center the holder.
The rest of installation is in reverse order of removal, note the following:
NOTE:
- After installing camshafts, do not crank engine for at least 30 minutes. The hydraulic equalization elements must seat themselves (otherwise the valves will crash into the pistons).
- After working on the valvetrain, carefully rotate engine by hand at least 2 full revolutions to ensure that valves do not strike the pistons when starting.
- Position camshaft timing chains on camshafts Installing .
- Install left and right timing chain covers Installing .
- Install cylinder head cover: Left → Left cylinder head cover, removing and installing , right → Right cylinder head cover, removing and installing .
- Install engine → Engine, installing .
Torque specifications
| Component | Nm |
|---|---|
| Bearing bracket to cylinder head | 8 |