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1. CAUTION: At no time, when the timing chain(s) are removed and the cylinder heads (6049) are installed, may the crankshaft (6303) and camshafts (6250) be rotated. Failure to follow these directions will result in valve and/or piston damage. NOTE: Because this is not a free-wheeling engine, if it has jumped time, there will be damage to the valves and pistons (6108) and will require the removal of the cylinder heads . The camshaft sprockets (6256) should only be disassembled from the camshafts when one of the components is to be replaced. Remove valve covers (6582) , oil pan (6675) and engine front cover (6019) as described. 2. Remove crankshaft position sensor pulse wheel. 3. Rotate engine to No. 1 top dead center (TDC). 4. NOTE: Cam Positioning Tool Adapters 303-413 (T92P-6256-A) and Cam Positioning Tool 303-380 (T91P-6256-A) MUST be installed on camshaft to prevent camshaft from rotating. Install Cam Positioning Tool Adapters 303-413 (T92P-6256-A) and Cam Positioning Tool 303-380 (T91P-6256-A) on flats of camshafts . 5. Remove two bolts retaining RH timing chain tensioner (6L266) to cylinder head and remove timing chain tensioner . 6. Remove RH timing chain tensioner arm (6L253) . 7. Remove two bolts retaining RH timing chain guide (6K297) to cylinder head and remove timing chain guide . 8. Remove RH timing chain from camshaft sprocket and crankshaft sprockets (6306) . 9. NOTE: Cam Positioning Tool Adapters 303-413 (T92P-6256-A) and Cam Positioning Tool 303-380 (T91P-6256-A) MUST be installed on camshaft to prevent camshaft from rotating. Remove two bolts retaining LH timing chain tensioner to cylinder head and remove timing chain tensioner . 10. Remove LH timing chain tensioner arm . 11. Remove two bolts retaining LH timing chain guide to cylinder head and remove timing chain guide . 12. Remove LH timing chain from camshaft sprocket and crankshaft sprocket . 13. If necessary, remove camshaft sprockets and crankshaft sprockets as described. 14. CAUTION: Do not rotate crankshaft and/or camshafts . Engine damage may occur. Inspect the plastic running face on timing chain tensioner arms and timing chain guides . If worn or damaged, remove and clean oil pan and oil pump screen cover and tube (6622) . Installation

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Removing Cylinder head installed Remove noise insulation panel -arrows-. Remove front bumper => Repair Manual, Body Exterior, Repair Group 63 Move lock carrier to service position => Repair Manual, Body Exterior, Repair Group 50 Remove ribbed belt => Page 13-1. Remove toothed belt => Page 13-4. Left cylinder head Remove left-hand cylinder head cover => Page 15-22. Right cylinder head Remove right-hand cylinder head cover => Page 15-25 All: Unbolt Hall sensor housing (10 Nm). Remove bolt securing Hall sensor rotor (20 Nm) and carefully lever off rotor using a screwdriver. Insert camshaft clamp 3391 in securing plates of two camshafts. Loosen both camshaft bolts and remove approx. 5 turns. Take out camshaft clamp 3391. Pull off both camshaft sprockets with special tool T40001. Using a screwdriver, carefully pry oil feed lines for camshaft bearings out of camshaft bearings. Make sure that the retaining catches do not break off when prying out the oil lines. Secure camshaft adjuster using retainer for chain tensioner 3366. Note: Do not over tighten retainer for chain tensioner, otherwise camshaft adjuster can be damaged. Check TDC position of camshafts once again. Note: The two markings on the camshafts must be in line with the two arrows on the bearing caps. Clean drive chain and camshaft chain sprockets in vicinity of arrows on bearing caps and mark position of chain on sprockets with paint opposite two arrows. Note: The distance between the two arrows (and thus between the paint markings) is 16 rollers on the chain. The notch on the exhaust camshaft is offset slightly towards the inside in relation to chain roller -1-. Do not mark the chain with a center punch or by making a notch or similar.

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1. CAUTION: At no time, when the timing chain(s) are removed and the cylinder heads (6049) are installed, may the crankshaft (6303) and/or camshafts (6250) be rotated. Failure to follow these directions will result in valve and/or piston damage. NOTE: Because this is not a free-wheeling engine, and it jumps time, there will be damage to the valves and/or pistons (6108) and will require the removal of the cylinder heads. The camshaft sprockets (6256) should only be disassembled from the camshafts when one of the components is to be replaced. Remove valve covers (6582) and engine front cover (6019) as described. 2. Remove crankshaft position sensor pulse wheel. 3. Rotate engine to No. 1 top dead center (TDC). 4. NOTE: This will prevent accidental rotation of the camshafts. NOTE: Cam Positioning Tool Adapters T92P-6256-A and Cam Positioning Tool T91P-6256-A must be installed on camshaft to prevent camshaft from rotating. Install Cam Positioning Tool Adapters T92P-6256-A and Cam Positioning Tool T91P-6256-A on flats of camshaft. 5. Remove two bolts retaining RH timing chain tensioner (6L266) to cylinder head and remove timing chain tensioner. 6. Remove RH timing chain tensioner arm (6L253). 7. Remove two bolts retaining RH timing chain guide (6K297) to cylinder head and remove timing chain guide. 8. Remove RH timing chain from camshaft sprocket and crankshaft sprocket (6306). 9. NOTE: Cam Positioning Tool Adapters T92P-6256-A and Cam Positioning Tool T91P-6256-A must be installed on camshaft to prevent camshaft from rotating. Remove two bolts retaining LH timing chain tensioner to cylinder head and remove timing chain tensioner. 10. Remove LH timing chain tensioner arm. 11. Remove two bolts retaining LH timing chain guide to cylinder head and remove timing chain guide. 12. Remove LH timing chain from camshaft sprocket and crankshaft sprocket. 13. If necessary, remove camshaft sprockets and crankshaft sprockets as described. 14. CAUTION: Do not rotate crankshaft and/or camshafts or possible engine damage may occur. Inspect the plastic running face on timing chain tensioner arms and timing chain guides. If worn or damaged, remove and clean oil pan (6675) and oil pump screen cover and tube (6622).

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CAUTION: Since the engine is not free wheeling if the crankshaft (6303) or the camshafts (6250) are moved in any manner during removal and installation the crankshaft and camshafts must be resynchronized. These steps are located in Engine Assembly Steps 36 to 48. 1. Remove the engine front cover (6019); refer to Engine Front Cover — 5.4L in this section. 2. Remove the crankshaft sensor ring from the crankshaft. 3. CAUTION: Unless otherwise instructed, at no time when the timing chains are removed and the cylinder heads are installed is the crankshaft or camshaft to be rotated. Severe piston and valve damage will occur. Position the crankshaft with the Crankshaft Holding Tool as shown. 4. Install and fully tighten the Camshaft Holding Tools on both camshafts. 5. Remove the timing chain tensioning system from both timing chain/belts (6268). 1. Remove the bolts. 2. Remove the timing chain tensioners (6L266). 3. Remove the timing chain tensioner arms (6L253). 6. CAUTION: Unless otherwise instructed, at no time when the timing chains are removed and the cylinders heads are installed is the crankshaft or camshaft to be rotated. Severe piston and valve damage will occur. CAUTION: Do not remove the Camshaft Holding Tool. Remove the LH and RH timing chains and the crankshaft sprockets (6306). ? Remove the Crankshaft Holding Tool. ? Remove the RH timing chain from the camshaft sprocket. ? Remove the RH timing chain and outer crankshaft sprocket from the crankshaft. ? Repeat for the LH timing chain and crankshaft sprocket. 7. Remove both timing chain guides (6K297). ? Remove the bolts. ? Remove both timing chain guides. 1. CAUTION: Timing chain procedures must be followed exactly or damage to valves and pistons will result. CAUTION: Do not compress the ratchet assembly. This will damage the ratchet assembly. Compress the tensioner plunger, using an edge of a vise. 2. Using a small screwdriver or pick, push back and hold the ratchet mechanism. 3. While holding the ratchet mechanism, push the ratchet arm back into the tensioner housing.

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CAUTION: Since the engine is not free-wheeling, timing procedures must be followed exactly or piston and valve damage may occur. 1. Remove the engine front cover. For additional information, refer to Engine Front Cover—4.6L in this section. 2. Remove the crankshaft sensor ring from the crankshaft. 3. Rotate the crankshaft until the timing mark on the RH camshaft sprocket is approximately at the 11 o’clock position, and the timing mark on the LH camshaft sprocket is approximately at the 12 o’clock position. 4. Install the special tools on the camshaft. 5. Remove the timing chain tensioning system from both timing chains. 1. Remove the bolts. 2. Remove the timing chain tensioners. 3. Remove the timing chain tensioner arms. 6. Remove the timing chains and the crankshaft sprockets. 7. Remove the timing chain guides. 1. Remove the bolts. 2. Remove the LH timing chain guide. 3. Remove the bolts. 4. Remove the RH timing chain guide. Installation 1. CAUTION: The timing chain procedures must be followed exactly or damage to valves and pistons will result. CAUTION: Do not compress the ratchet assembly. This will damage the ratchet assembly. Compress the tensioner plunger, using an edge of a vise.