Part 1 of 2

Removal

CAUTION:
- Use fender covers to avoid damaging painted surfaces.
- To avoid damaging the cylinder head, wait until the engine coolant temperature drops below normal temperature before removing it.
- When handling a metal gasket, take care not to fold the gasket or damage the contact surface of the gasket.
- To avoid damage, unplug the wiring connectors carefully while holding the connector portion.

NOTE:
Mark all wiring and hoses to avoid misconnection.

1. Disconnect the battery negative terminal.
2. Remove the engine cover (A).
3. Remove the air cleaner assembly.
(1) Remove the air duct (B).
(2) Disconnect the breather hose (C) and the intensifier hose (D).
(3) Disconnect the air intake hose and then remove the air cleaner assembly (E).

Tightening torque
Hose clamp bolt:
2.9 - 4.9N.m (0.3 - 0.5kgf.m, 2.2 - 3.6lb-ft)
Air cleaner assembly bolts:
7.8 - 9.8N.m (0.8 - 1.0kgf.m, 5.8 - 7.2lb-ft)




4. Disconnect the battery positive terminal and then remove the battery (A).

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




5. Remove the under cover and side cover.
6. Loosen the drain plug (A), and drain the coolant. Remove the radiator cap to speed draining.




7. Remove the front muffler (A).

Tightening torque:
39.2 - 58.8 N.m (4.0 - 6.0 kgf.m, 28.9 - 43.4 lb-ft)




8. Remove the radiator upper hose (A) and lower hose (B).




9. Disconnect the wiring connectors, harness clamps and hoses from the cylinder head, Intake manifold and exhaust manifold.
10. Disconnect the fuel hose (A) and heater hoses (B).




11. Disconnect the throttle body coolant hoses (A), oil cooler coolant hoses (B) and then remove the water temperature control assembly (C).

Tightening torque :
Bolts : 14.7 - 19.6N.m(1.5 - 2.0kgf.m, 10.8 - 14.5lb-ft)
Nuts : 18.6 - 23.5N.m(1.9 - 2.4kgf.m, 13.7 - 17.4lb-ft)




12. Remove the intake & exhaust manifold.
13. Remove the timing chain.
14. Remove the intake CVVT assembly (A) and exhaust CVVT assembly (B).





NOTE:
When removing the CVVT assembly bolt, hold the camshaft with a wrench on the hex on the camshaft (A).




15. Remove the camshaft.
(1) Remove the front camshaft bearing cap (A).




(2) Remove the exhaust camshaft upper bearing (A).




(3) Remove the camshaft bearing cap (A), in the sequence shown.




(4) Remove the camshafts (A).




(5) Remove the exhaust camshaft lower bearing (A).




16. Use a torx wrench, remove the intake OCV (A).




17. Use a torx wrench, remove the exhaust OCV (A).




18. Remove the cylinder head bolts and then remove the cylinder head.
(1) Using triple square wrench, uniformly loosen and remove the 10 cylinder head bolts, in several passes, in the sequence shown. Remove the 10 cylinder head bolts and plate washers.





CAUTION:
Head warpage or cracking could result from removing bolts in an incorrect order.

(2) Lift the cylinder head from the dowels on the cylinder block and place the cylinder head on wooden blocks on a bench.

CAUTION:
Be careful not to damage the contact surfaces of the cylinder head and cylinder block.

19. Remove the cylinder head gasket.

Disassembly

NOTE:
Identify MLA(Mechanical Lash Adjuster), valves, valve springs as they are removed so that each item can be reinstalled in its original position.

1. Remove the MLAs (A).




2. Remove the valves.
(1) Using SST(09222-3K000, 09222-3K100), compress the valve spring and remove retainer lock.




(2) Remove the spring retainer.
(3) Remove the valve spring.
(4) Remove the valve.
(5) Using needle-nose pliers, remove the valve stem seal.

Inspection

Cylinder Head
1. Inspect for flatness.
Using a precision straight edge and feeler gauge, measure the surface the contacting the cylinder block and the manifolds for warpage.

Flatness of cylinder head gasket surface
Standard : Less than 0.05mm(0.002in.) (0.02mm(0.0008in.)/100x100)
Flatness of manifold mounting surface
Standard : Less than 0.1mm(0.0039in.)




2. Inspect for cracks.
Check the combustion chamber, intake ports, exhaust ports and cylinder block surface for cracks. If cracked, replace the cylinder head.

Valve And Valve Spring
1. Inspect valve stems and valve guides.
(1) Using a caliper gauge, measure the inside diameter of the valve guide.

Valve guide I.D.
Intake / Exhaust : 5.500 - 5.512mm (0.216 - 0.217in.)




(2) Using a micrometer, measure the diameter of the valve stem.

Valve stem O.D.
Intake : 5.465 - 5.480mm (0.2151 - 0.2157in.)
Exhaust : 5.458 - 5.470mm (0.2149 - 0.2153in.)




(3) Subtract the valve stem diameter measurement from the valve guide inside diameter measurement.

Valve stem-to-guide clearance
[Standard]
Intake : 0.020 - 0.047mm (0.0008 - 0.0018in.)
Exhaust : 0.030 - 0.054mm (0.0012 - 0.0021in.)
[Limit]
Intake : 0.07mm (0.0027in.)
Exhaust : 0.09mm (0.0035in.)

If the clearance is greater than maximum, replace the valve and valve guide.
2. Inspect the valves.
(1) Check the valve is ground to the correct valve face angle.
(2) Check that the surface of the valve for wear.
If the valve face is worn, replace the valve.
(3) Check the valve head margin thickness.
If the margin thickness is less than minimum, replace the valve.

Margin
[Standard]
Intake : 1.02mm(0.0401in.)
Exhaust : 1.09mm(0.0429in.)




(4) Check the valve length.

Valve length
[Standard]
Intake : 113.18mm(4.4559in.)
Exhaust : 105.84mm(4.1669in.)
[Limit]
Intake : 112.93mm(4.4461in.)
Exhaust : 105.59mm(4.1571in.)

(5) Check the surface of the valve stem tip for wear.
If the valve stem tip is worn, replace the valve.
3. Inspect the valve seats
Check the valve seat for evidence of overheating and improper contact with the valve face.
Replace the seat if necessary.
Before reconditioning the seat, check the valve guide for wear. If the valve guide is worn, replace it, then recondition the seat. Recondition the valve seat with a valve seat grinder or cutter. The valve seat contact width should be within specifications and centered on the valve face.
4. Inspect the valve springs.
(1) Using a steel square, measure the out-of-square of the valve spring.
(2) Using a vernier calipers, measure the free length of the valve spring.

Valve spring
[Standard]
Free height : 47.44mm (1.8677in.)
Out-of-square : 1.5°




If the free length is not as specified, replace the valve spring.

MLA
1. Inspect the MLA.
Using a micrometer, measure the MLA outside diameter.

MLA O.D.
Intake/Exhaust :
31.964 - 31.980mm(1.2584 - 1.2590in.)

2. Using a caliper gauge, measure MLA tappet bore inner diameter of cylinder head.

Tappet bore I.D.
Intake/Exhaust :
32.000 - 32.025mm(1.2598 - 1.2608in.)

3. Subtract MLA outside diameter measurement from tappet bore inside diameter measurement.

MLA to tappet bore clearance
[Standard]
Intake/Exhaust : 0.020 - 0.061mm(0.0008 - 0.0024in.)
[Limit]
Intake/Exhaust : 0.07mm(0.0027in.)

Camshaft
1. Inspect the cam lobes.
Using a micrometer, measure the cam lobe height.

Cam height
[Standard value]
Intake : 44.10 - 44.30mm (1.7362 - 1.7440in.)
Exhaust : 44.90 - 45.10mm (1.7677 - 1.7756in.)




If the cam lobe height is less than standard, replace the camshaft.
2. Inspect the camshaft journal clearance.
(1) Clean the bearing caps and camshaft journals.
(2) Place the camshafts on the cylinder head.
(3) Lay a strip of plastigage across each of the camshaft journal.




(4) Install the bearing caps.

CAUTION:
Do not turn the camshaft.

(5) Remove the bearing caps.
(6) Measure the plastigage at its widest point.

Bearing oil clearance
[Standard value]
Intake :
No.1 journal : 0.022 - 0.057mm (0.00087 - 0.00224in)
No.2,3,4,5 : 0.045 - 0.082mm (0.00177 - 0.00323in)
Exhaust:
No.1 : 0 - 0.032mm (0 - 0.0012)
No.2,3,4,5 : 0.045 - 0.082mm (0.00177 - 0.00323in)

[Limit]
Intake:
No.1 journal : 0.09mm (0.0035in)
No.2,3,4,5 : 0.12mm (0.0047in)
Exhaust :
No.1,2,3,4,5 : 0.12mm (0.0047in)




If the oil clearance is greater than maximum, replace the camshaft. If necessary, replace cylinder head.
(7) Completely remove the plastigage.
(8) Remove the camshafts.
3. Inspect the camshaft end play.
(1) Install the camshafts.
(2) Using a dial indicator, measure the end play while moving the camshaft back and forth.

Camshaft end play
[Standard value] : 0.04 - 0.16mm (0.0016 - 0.0062in.)
[Limit] : 0.20mm (0.0078in.)




If the end play is greater than maximum, replace the camshaft. If necessary, replace cylinder head.
(3) Remove the camshafts.

Exhaust Cam Shaft Bearing
1. Check the cylinder head bore mark.

Location Of Cylinder Head Bore Mark




Discrimination Of Cylinder Head





2. Select class of camshaft bearing same as class of cylinder head as shown on the table below.

Place Of Exhaust Cam Shaft Bearing Identification Mark




Discrimination Of Exhaust Camshaft Bearing






Oil clearance :0 - 0.032mm (0 - 0.0012in.)