Valve Clearance Inspection And Adjustment

(Refer to Cylinder Head Assembly - "CYLINDER HEAD COVER ")

1. Turn the crankshaft pulley and align its groove with the timing mark of the timing chain cover.

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2. Check that the marks of the intake and exhaust CVVT sprockets are in straight line on the cylinder head surface as displayed in the image. If not, turn the crankshaft one revolution (360°).

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   NOTE:

   • Do not turn the crankshaft damper pulley counterclockwise.
3. Mark the timing chain links corresponding to the timing marks on the CVVT sprockets with a indelible marker.

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1. Check only the intake valves of the (1st and 2nd cylinders) and exhaust valves of the (1st and 3rd cylinders) for their clearance.

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   • Using a thickness gauge, measure the clearance between the tappet and the base circle of camshaft.
   • Record the out-of-specification valve clearance measurements. They will be used later to determine the required tappet for adjusting.

   Valve Clearance Specification (Engine Coolant Temperature: 20°C [68°F]) 

   Limit

   Intake: 0.17 - 0.23 mm (0.0067 - 0.0091 in.)

   Exhaust: 0.32 - 0.38 mm (0.0126 - 0.0150 in.)

2. Turn the crankshaft pulley one revolution clockwise (360°) and align its groove with timing mark of the timing chain cover.
3. Check the intake valves of the (3rd and 4th cylinders) and exhaust valves of the (2nd and 4th cylinders) for their clearance.

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1. Put a jack under the oil pan.

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   NOTE:

   • Place a wooden block between the jack and the oil pan to prevent damage to the oil pan.
2. Disconnect the engine ground cable (A).

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3. Remove the engine mounting support bracket.

   (Refer to Engine and Transmission Assembly - "ENGINE MOUNTING ")

4. Lift the engine slightly using the jack to obtain space.

1. Remove the service hole bolt (A).

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2. Lock the timing chain tensioner in the fully retracted position.

   Insert a pick into the service hole in the timing chain cover and lower the hole in the left side of the ratchet plate (A) on the tensioner to allow the pawl (B: located inside the tensioner behind the ratchet plate) to be lifted.

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3. Remove the camshaft bearing caps (A) with the order below.

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   Fig 1: Camshaft Bearing Caps Bolts Loosening Sequence

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4. With the pawl lifted, have a helper pull up the exhaust CVVT & camshaft (A) to allow the tensioner plunger (B) to retract.

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5. With the tensioner plunger in the fully retracted position, raise the hole in the left side of the ratchet plate (A) again through the service hole in the chain cover to align the ratchet plate hole with the hole in the tensioner body behind the ratchet plate, then lock the tensioner by inserting the pick through the ratchet plate and tensioner body holes.

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6. Separate the exhaust camshaft (A) from the exhaust CVVT by removing the bolt.

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   Information 

   • When installing the CVVT assembly bolt, hold the camshaft with a wrench to prevent the camshaft from rotating.
7. Remove the exhaust CVVT (A) from the timing chain.

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8. Remove the intake CVVT & camshaft (A).

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   NOTE:

   • Fasten the timing chain to the engine hanger with a cable tie or strap not to allow the timing chain to fall down when removing the intake CVVT & camshaft.

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9. Measure the thickness of the removed tappet using a micrometer.

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10. Calculate the thickness of a new tappet so that the valve clearance comes within the specified value.

    Valve clearance (Engine coolant temperature: 20°C)

    T: Thickness of removed tappet

    A: Measured valve clearance

    N: Thickness of new tappet

    Intake: N = T + [A - 0.20mm (0.0079in.)]

    Exhaust: N = T + [A - 0.25mm (0.0098in.)]

11. Select a new tappet with a thickness as close as possible to the calculated value.
    NOTE:

    • Shims are available in 41 size increments of 0.015mm (0.0006in.) from 3.00mm (0.118in.) to 3.690mm (0.1417in.)
12. Place a new tappet on the cylinder head.
13. Install the intake CVVT & camshaft (A), with the timing mark on the intake CVVT sprocket aligned with the mark (painted link) on the timing chain.

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14. Install the exhaust CVVT (A), with the timing mark on the exhaust CVVT sprocket aligned with the mark (painted link) on the timing chain.

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15. Install the exhaust camshaft (A) to the exhaust CVVT.

    Tightening Torque: 

    63.7 - 73.5 N.m (6.5 - 7.5 kgf.m, 47.0 - 54.2 lb-ft)

16. Remove the pick from the service hole in the timing chain cover.

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17. Check that each timing mark of the intake and exhaust CVVT sprockets is aligned as displayed in image.

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18. Install the service hole bolt (A).

    Tightening Torque: 

    27.5 - 30.4 N.m (2.8 - 3.1 kgf.m, 20.3 - 22.4 lb-ft)

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19. Install the engine mounting support bracket.

    (Refer to Engine and Transmission Assembly - "ENGINE MOUNTING ")

    1. Connect the engine ground cable (A).

       Tightening Torque: 

       10.8 - 13.7 N.m (1.1 - 1.4 kgf.m, 8.0 - 10.1 lb-ft)

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    2. Remove the jack from the oil pan.
20. Install the camshaft bearing caps (A) with the order below.

    Tightening Torque 

    1st step

    M6 bolt:

    5.9 N.m (0.6 kgf.m, 4.3 lb-ft)

    M8 bolt:

    9.8 N.m (1.0 kgf.m, 7.2 lb-ft)

    2nd step

    M6 bolts:

    11.8 - 12.7 N.m (1.2 - 1.3 kgf.m, 8.7 - 9.4 lb-ft)

    M8 bolts:

    18.6 - 22.6 N.m (1.9 - 2.3 kgf.m, 13.7 - 16.6 lb-ft)

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    Fig 2: Camshaft Bearing Caps Bolts Tightening Sequence

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21. Turn the crankshaft two turns in the operating direction (clockwise) and check that the marks of the intake and exhaust CVVT sprockets are in straight line on the cylinder head surface.

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22. Recheck the valve clearance.

    Valve clearance (Engine coolant temperature: 20°C) 

    [Specification]

    Intake: 0.17 - 0.23 mm (0.0067 - 0.0091 in.)

    Exhaust: 0.32 - 0.38 mm (0.0126 - 0.0150 in.)

23. Install the exhaust oil control valve (OCV) adaptor (A).

    Tightening Torque: 

    9.8 - 11.8 N.m (1.0 - 1.2 kgf.m, 7.2 - 8.7 lb-ft)

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    NOTE:

    • When installing the oil control valve (OCV) adapter, check the front cam cap o-ring.
24. Install the cylinder head cover.

    (Refer to Cylinder Head Assembly - "CYLINDER HEAD COVER ")