Camshaft Timing Chain, Removing from Camshaft, Chain Tensioner
Camshaft Timing Chain, Removing from Camshaft, Chain Tensioner
Special tools, testers and auxiliary items required
• Counter-Holder (T10172) with Pin (T10172/2)
• Adapter (T40058)
• Locking Pin (T40069)
• Camshaft Locator (T40070) (qty. 2)
• Locking Pin (T40071) (qty. 2)
• Multi-Point Socket (T10035)
Removing
• The camshaft timing chains remain on the engine in the following description. If the timing chains for camshafts are to be completely removed, the lower timing chain cover must also be removed. Refer to => [ Lower Timing Chain Cover ] Lower Timing Chain Cover.
- Remove the cylinder head cover. Refer to: Left => [ Left Cylinder Head Cover ] Left Cylinder Head Cover, right => [ Right Cylinder Head Cover ] Right Cylinder Head Cover.
- Remove left and right timing chain covers. Refer to => [ Left and Right Timing Chain Covers ] Left and Right Timing Chain Covers.
- Insert guide pin of Adapter (T40058) so that large diameter - arrow 1 - points to engine. Small diameter - arrow 2 - points to adapter.
- Using Socket (T40058), rotate crankshaft in direction of engine rotation - arrow - to TDC.
• The threaded holes - arrows - in the camshafts must face upward.
- Mount the Camshaft Locating Tool (T40070) on both cylinder heads and tighten the bolts - arrows - to 20 Nm.
• The Camshaft Locating Tool (T40070) is correctly positioned when the holes for the cylinder head bolts remain free.
- Remove sealing plug - arrow - from cylinder block.
- Install the Crankshaft Holder (T40069) in the hole - 1 - to 10 Nm. If necessary rotate the crankshaft back and forth slightly to completely center the holder.
- Mark running direction of left camshaft timing chain with paint.
- Remove bolts - 1 - and - 2 - for camshaft adjuster using Multipoint Socket (T10035).
- Remove both camshaft adjusters.
- Remove bolts - 1 - and - 2 - and remove chain tensioner.
- Mark running direction of right camshaft timing chain with paint.
- Remove bolts - 1 - and - 2 - for camshaft adjuster using Multipoint Socket (T10035).
- Remove both camshaft adjusters.
- Remove bolts - 1 - and - 2 - and remove chain tensioner.
Installing
• Always replace bolts that are tightened to torque as well as O-rings and gaskets.
• When turning camshaft, crankshaft must not be at TDC for any cylinder. Valves and/or pistons may be damaged.
• Drive chain for timing mechanism installed. Refer to => [ Timing Mechanism Drive Chain ] Timing Mechanism Drive Chain.
• Secure crankshaft in TDC position using Crankshaft Holder (T40069).
• Camshaft Locating Tool (T40070) mounted on both cylinder heads and tightened to 20 Nm.
- Fully relieve tension of guide rail for left and right camshaft timing chain tensioner - arrow -.
• The piston of the tensioning element - 1 - must be driven out completely, thereby releasing the retainer - for this the chain tensioner must be removed.
• If the tensioning element is to be removed from the chain tensioner, observe the installed position: Hole in housing floor faces toward chain tensioner, piston faces toward tensioning rail.
- Press the guide rail of the left and right camshaft timing chain inward - arrow - up to the stop and secure the chain tensioner with the Locking Pin (T40071).
- Clean oil strainer - 3 - in both chain tensioners if necessary.
- Place a new gasket - 2 - onto the rear of the chain tensioner - 1 -.
- Set the chain tensioner in place on the left cylinder head and install the camshaft timing chain, as shown in the illustration.
- Tighten bolts - 1 - and - 2 -.
- Replace camshaft bolts.
- Place camshaft timing chain onto drive sprocket and onto camshaft adjusters and loosely thread in the bolts - 1 - and - 2 -.
• Both camshaft adjusters must be able to still be rotated on camshaft and must not tip.
- Remove Locking Pin (T40071).
- Set the chain tensioner in place on the right cylinder head and install the camshaft timing chain, as shown in the illustration.
- Tighten bolts - 1 - and - 2 -.
- Replace camshaft bolts.
- Place camshaft timing chain onto drive sprocket and onto camshaft adjusters and loosely thread in the bolts - 1 - and - 2 -.
• Both camshaft adjusters must be able to still be rotated on camshaft and must not tip.
- Remove Locking Pin (T40071).
- Set the Counter-Holder (T10172) with Pin (T10172/2) in place on the camshaft adjuster of the left intake camshaft.
- Hold the camshaft timing chain pretensioned by pressing on counter-holder in direction of - arrow -.
- Simultaneously, pre-torque the camshaft bolt using the Multipoint Socket (T10035) and torque wrench.
• Tightening Specifications: 40 Nm.
- Continue holding the pretension on the intake camshaft and pre-torque the bolt - 1 - on the exhaust camshaft.
• Tightening Specifications: 40 Nm.
- Tighten camshaft bolts - 1 - and - 2 - on left cylinder head to final tightening specification.
• Tightening Specifications 80 Nm plus an additional 90° turn.
- Set the Counter-Holder (T10172) with Pin (T10172/2) in place on the camshaft adjuster of the right exhaust camshaft.
- Hold the camshaft timing chain pretensioned by pressing on counter-holder in direction of - arrow -.
- Simultaneously, pre-torque the camshaft bolt using the Multipoint Socket (T10035) and torque wrench.
• Tightening Specifications: 40 Nm.
- Continue holding the pretension on the exhaust camshaft and pre-torque the bolt - 1 - on the intake camshaft.
• Tightening Specifications: 40 Nm.
- Tighten camshaft bolts - 1 - and - 2 - on right cylinder head to final tightening specification.
• Tightening Specifications: 80 Nm plus an additional 90° turn.
- Remove Camshaft Locators (T40070) on both cylinder heads.
- Remove Crankshaft Holder (T40069).
- Using Key (T40058) turn crankshaft two complete rotations in direction of engine rotation - arrow - until crankshaft stands at TDC again.
• If rotated unintentionally beyond TDC, turn back crankshaft again approximately 30° and set to TDC again.
• The threaded holes - arrows - in the camshafts must face upward.
- Mount the Camshaft Locating Tools (T40070) to both cylinder heads and tighten the bolts - arrows - to 20 Nm.
• The Camshaft Locating Tool (T40070) is correctly positioned when the holes for the cylinder head bolts remain free.
- Screw the Crankshaft Holder (T40069) directly into the hole.
• The Crankshaft Holder (T40069) must engage in the locating hole of the crankshaft - 1 -, otherwise repeat the adjustment.
- Remove camshaft locating tools on both cylinder heads.
- Remove crankshaft holder.
- Screw sealing plug of TDC marking with new seal into cylinder block.
Further installation is in reverse order of removal, note the following:
- Install left and right timing chain covers. Refer to => [ Left and Right Timing Chain Covers ] Left and Right Timing Chain Covers.
- Install cylinder head cover. Refer to: Left => [ Left Cylinder Head Cover ] Left Cylinder Head Cover, right => [ Right Cylinder Head Cover ] Right Cylinder Head Cover.
Tightening Specifications
