Valve Clearance Inspection And Adjustment

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

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

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2. Check that the mark of the camshaft timing sprockets is in straight line on the cylinder head surface as shown in the illustration.

   If not, turn the crankshaft clockwise one revolution (360°).

   [LH] 

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   [RH] 

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1. With No. 1 cylinder at TDC, inspect clearances only for the valves shown below.

   [LH] 

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   Courtesy of KIA MOTORS AMERICA, INC.

   [RH] 

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   Courtesy of KIA MOTORS AMERICA, INC.

   How to Measure:

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

   Valve clearance (Engine coolant temperature: 20°C [68°F]) 

   [Specification] 

   Intake: 0.17 - 0.23 mm (0.0067 - 0.0090 in.)

   Exhaust: 0.27 - 0.33 mm (0.0106 - 0.0129 in.)

2. Turn the crankshaft pulley clockwise one revolution (360°) and align the groove with timing mark "T" of the lower timing chain cover.
3. With the No. 4 cylinder at TDC, inspect clearances only for the valves shown in diagram below. (Refer to procedure step  1.)

   [LH] 

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   Courtesy of KIA MOTORS AMERICA, INC.

   [RH] 

Courtesy of KIA MOTORS AMERICA, INC.

Courtesy of KIA MOTORS AMERICA, INC.

1. Set the No. 1 cylinder to the TDC/compression.
2. Remove the camshaft assembly.

   (Refer to Cylinder Head Assembly - "CVVT & CAMSHAFT ")

3. Remove the tappets.
4. Measure the thickness of the removed tappet using a micrometer.

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

   T  : Thickness of removed tappet

   A  : Measured valve clearance

   N  : Thickness of new tappet

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

   Exhaust  : N = T + [A - 0.30 mm (0.0118 in.)]

6. Select a new tappet with a thickness as close as possible to the calculated value.
   NOTE: Shims are available in 41 size increments of 0.015 mm (0.0006 in.) from 3.00 mm (0.1181 in.) to 3.60 mm (0.1417 in.).
7. Place a new tappet on the cylinder head.
   NOTE: Apply engine oil around and on top of selected tappet.
8. Install the intake and exhaust camshafts.
9. Install the bearing caps.

   (Refer to Cylinder Head Assembly - "CVVT & CAMSHAFT ")

10. Install the timing chain.

    (Refer to Timing System - "TIMING CHAIN ")

11. Make two turns on the crankshaft in the operating direction (clockwise) and realign crankshaft sprocket and camshaft sprocket timing marks.

    [LH] 

    Courtesy of KIA MOTORS AMERICA, INC.

    [RH] 

    Courtesy of KIA MOTORS AMERICA, INC.

12. Recheck the valve clearance.

    Valve clearance (Engine coolant temperature: 20°C [68°F]) 

    [Specification] 

    Intake: 0.17 - 0.23 mm (0.0067 - 0.0090 in.)

    Exhaust: 0.27 - 0.33 mm (0.0106 - 0.0129 in.)