Valve Clearance Inspection And Adjustment

WARNING: This page is about a different variant/trim than selected.

NOTE: Inspect and adjust the valve clearance when the engine is cold (Engine coolant temperature: 20°C (68°F)) and cylinder head is installed on the cylinder block.

WARNING: In case of removing the high pressure fuel pump, high pressure fuel pipe, delivery pipe, and injector, there may be injury caused by leakage of the high pressure fuel. So don't do any repair work right after engine stops.

Remove the cylinder head cover.
(Refer to Cylinder Head Assembly - "CYLINDER HEAD COVER ")
Set No. 1 cylinder to TDC/compression.
1. Turn the crankshaft pulley and align its groove with the timing mark "T" of the lower timing chain cover.
  
  Fig 1: Aligning Groove With Timing Mark T Of Lower Timing Chain Cover
  Courtesy of HYUNDAI MOTOR AMERICA
2. Remove the timing chain cover.
  (Refer to Timing System - "TIMING CHAIN COVER ")
3. Check that the TDC marks (A) of the CVVT sprockets are in straight line on the cylinder head surface as shown in Fig 2.
  If not, turn the crankshaft one revolution (360°)
  
  Fig 2: Locating TDC Marks Of CVVT Sprockets In Straight Line On Cylinder Head Surface
  Courtesy of HYUNDAI MOTOR AMERICA
Inspect the valve clearance.
1. Check only the valve indicated as shown. Measure the valve clearance.
  
  Fig 3: Measuring Valve Clearance
  Courtesy of HYUNDAI MOTOR AMERICA
  - 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 replacement adjusting tappet.
  Valve clearance
  
  Specification
  
  Engine coolant temperature: 20°C [68°F]
  
  Limit
  
  Intake: 0.10 ~ 0.30 mm (0.0039 ~ 0.0118 in.)
  
  Exhaust: 0.20 ~ 0.40 mm (0.0079 ~ 0.0157 in.)
2. Turn the crankshaft pulley one revolution (360°) and align the groove with timing mark "T" of the lower timing chain cover.
3. Check only valves indicated as shown. Measure the valve clearance.
  
  Fig 4: Measuring Valve Clearance
  Courtesy of HYUNDAI MOTOR AMERICA
Adjust the intake and exhaust valve clearance.
1. Remove the camshaft assembly.
  (Refer to Cylinder Head Assembly - "CAMSHAFT ")
2. Measure the thickness of the removed tappet using a micrometer.
  
  Fig 5: Measuring Thickness Of Removed Tappet Using Micrometer
  Courtesy of HYUNDAI MOTOR AMERICA
3. Calculate the thickness of a new tappet so that the valve clearance comes within the specified value.
  Valve clearance [Engine coolant temperature: 20°C (68°F)]
  
  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.)]
4. Select a new tappet with a thickness as close as possible to the calculated value.
  NOTE: Shims are available in 47 size increments of 0.015 mm (0.0006 in.) from 3.00 mm (0.11 in.) to 3.690 mm (0.1452 in.)
5. Place a new tappet on the cylinder head.
6. Install the camshaft assembly.
  (Refer to Cylinder Head Assembly - "CAMSHAFT ")
7. Turn the crankshaft two turns in the operating direction (clockwise), and then check that the TDC marks (A) of the CVVT sprockets are in straight line on the cylinder head surface.
  
  Fig 6: Checking TDC Marks Of CVVT Sprockets In Straight Line On Cylinder Head Surface
  Courtesy of HYUNDAI MOTOR AMERICA
8. 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: 0.32 ~ 0.38 mm (0.0126 ~ 0.0150 in.)