Hyundai Tiburon (2003 year). Manual — part 26

TIBURON(GK) > 2003 > G 2.7 V6 DOHC > Engine Mechanical System > Cylinder Head Assembly > Valve
> Repair procedures, TIBURON(GK) > 2003 > G 2.7 V6 DOHC > Engine Mechanical System > Cylinder
Head Assembly > Valve > Repair procedures

DISASSEMBLY

1. Drain the coolant and disconnect the upper radiator hose.

2. Remove the breather hose and air-intake hose.

3. Remove the vacuum hose, fuel hose and coolant hose.

4. Remove the intake manifold.

5. Remove the cables from the spark plugs. The cables should be removed by holding the boot portion.

6. Remove the ignition coil.

7. Remove the upper and lower timing belt cover.

8. Remove the timing belt and camshaft sprockets.

9. Remove the heat protector and exhaust manifold assembly.

10. Remove the coolant pump pulley and head cover.

11. Remove the intake and exhaust camshaft.

12. Remove the cylinder head assembly. The cylinder head bolts should be removed using the S12 mm socket,

in two or three steps.

13. Clean the gasket pieces from the cylinder block top surface and cylinder head bottom surface.

Make sure that fragments from the gasket do not fall in the engine.

INSPECTION

1. Remove scale, sealing compound and carbon deposits. After cleaning oil passages, apply compressed air to

make certain that the passages are notclogged.

2. Visually check the cylinder head for cracks, damage or water leakage.

3. Check the cylinder head surface for flatness with a straight edge and feeler gauge as shown in the illustration.

Cylinder head flatness
Standard dimensions : Max. 0.03mm (0.0059 in.)
Service limit : 0.05mm (0.0020 in.)

Valve Guides

Valve stem-to-guide clearance
Standard value
Intake : 0.02 ~ 0.05mm (0.0009 ~ 0.0020in.)
Exhaust : 0.035 ~ 0.065mm (0.0014 ~ 0.0026 in.)
Service limit
Intake : 0.10mm(0.0039 in.)
Exhaust : 0.15mm(0.0059 in.)

Valve

1. Replace the valve if its stem is bent, worn or damaged. Also replace it if the stem end (the surface contacting

the hydraulic-lash adjuster) ishollowed out.

2. Check the valve face contact area, and recondition or replace as necessary.

3. Replace the valve if the width of the margin (thickness of the valve head) is less than the minimum specified.

Valve margin
Standard value
Intake : 1.0mm(0.0394 in.)
Exhaust : 1.3mm(0.0512 in.)
Service limit
Intake : 0.5mm (0.0197in.)
Exhaust : 0.8mm (0.0315in.)

Valve Spring

1. Check the free height of each valve spring and replace if necessary.

2. Using a square, test the squareness of each valve spring. If the spring is excessively out-of-square, replace it.

Valve spring
Standard value
Free height : 42.5mm (1.6732 in.)
Load : 21.9kg/35mm (48.4 lb/1.3780in.)
Out of squareness : Max. 1.5°
Service limit
Load : 21.9kg/34mm (48.4 lb/1.3386in.)
Out of squareness : Max. 3°

Replacing Valve Guide

1. Using the special tool (09221-3F100 A/B), withdraw the old valve guide out the bottom of the cylinder head.

2. Recondition the valve guide hole so that it can receive the newly press-fitted oversize valve guide.

Valve Guide Oversizes

Size mm (in.)

Size mark

Oversize valve guide hole size

mm(in.)

0.05 (0.002) O.S.

5

11.050 ~ 11.068

(0.435 ~ 0.4357)

0.25 (0.010) O.S.

25

11.250 ~ 11.268

(0.443 ~ 0.4436)

0.50 (0.020) O.S.

50

11.500 ~ 11.518

(0.453 ~ 0.4535)