Hyundai Santa Fe: Cylinder Head Assembly / Cylinder Head. Repair procedures

Hyundai Santa Fe (TM) 2019-2024 Service Manual / Engine Mechanical System / Cylinder Head Assembly / Cylinder Head. Repair procedures

Removal
  
•
Be careful not to damage the parts located under the vehicle (floor under cover, fuel filter, fuel tank and canister) when raising the vehicle using the lift.
(Refer to General Information - "Lift and Support Points")
  
•
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.
  
•
Mark all wiring and hoses to avoid misconnection.
1.
Disconnect the battery negative terminal.
2.
Remove the engine cover.
(Refer to Engine and Transaxle Assembly - "Engine Cover")
3.
Remove the engine room under cover.
(Refer to Engine and Transaxle Assembly - "Engine Room Under Cover")
4.
Drain the coolant.
(Refer to Cooling System - "Coolant")
5.
Drain the engine oil.
(Refer to Lubrication System - "Engine Oil")
6.
Remove the air duct and air cleaner assembly.
(Refer to Intake and Exhaust System - "Air Cleaner")
7.
Remove the battery tray.
(Refer to Engine Electrical System - "Battery")
8.
Disconnect the radiator upper hose (A).
9.
Disconnect the brake vacuum hose (A).
10.
Disconnect the fuel hose (A) and purge control solenoid valve (PCSV) hose (B).
11.
Remove the delivery pipe.
(Refer to Engine Control / Fuel System - "Delivery Pipe")
12.
Remove the intake manifold.
(Refer to Intake and Exhaust System - "Intake Manifold")
13.
Remove the exhaust manifold.
(Refer to Intake and Exhaust System - "Exhaust Manifold")
14.
Remove the water temperature control assembly.
(Refer to Cooling System - "Water Temperature Control Assembly")
15.
Remove the timing chain.
(Refer to Timing System - "Timing Chain")
16.
Remove the camshaft front bearing cap (A) and camshaft bearing caps (B).
17.
Remove the intake camshaft & CVVT assembly (A).
18.
Remove the exhaust camshaft & CVVT assembly (A).
19.
Remove the cam carrier (A).
20.
Remove the hydraulic lash adjuster (HLA) (A) and swing arm (B).
21.
Remove the spark plug.
(Refer to Engine Electrical System - "Spark Plug")
22.
Remove the cylinder head.
(1)
Uniformly loosen and remove the cylinder head bolts, in several passes, in the sequence shown.

  
•
Head warpage or cracking could result from removing bolts in an incorrect order.
(2)
Lift the cylinder head (A) from the dowels on the cylinder block and place the cylinder head on wooden blocks on a bench.

  
•
Be careful not to damage the contact surfaces of the cylinder head and cylinder block.
(3)
Remove the cylinder head gasket (A).

  
•
Do not reuse the cylinder head gasket.
Disassembly
1.
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.
  
•
Do not reuse old valve stem seals.
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 0.05 mm (0.0019 in.) for total area
Less than 0.02 mm (0.0007 in.) for a section of 100 mm (3.9370 in.) X 100 mm (3.9370 in.)
Flatness of manifold mounting surface (Intake/Exhaust)
Standard : Less than 0.10 mm (0.0039 in.)

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 inner diameter
Intake / Exhaust :
5.500 - 5.512 mm (0.21654 - 0.21701 in.)

(2)
Using a micrometer, measure the diameter of the valve stem.
Valve stem outer diameter
Intake : 5.460 - 5.475 mm (0.2150 - 0.2156 in.)
Exhaust : 5.453 - 5.465 mm (0.2147 - 0.2152 in.)

(3)
Subtract the valve stem diameter measurement from the valve guide inside diameter measurement.
Valve stem-to-guide clearance
[Standard]
Intake : 0.020 - 0.047 mm (0.00078 - 0.00185 in.)
Exhaust : 0.030 - 0.054 mm (0.00118 - 0.00212 in.)
[Limit]
Intake : 0.070 mm (0.00275 in.)
Exhaust : 0.090 mm (0.00354 in.)
If the clearance is greater than maximum, replace the valve or cylinder head.
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.
Valve head thickness (Margin)
[Standard]
Intake : 0.8 mm (0.03150 in.)
Exhaust : 0.8 mm (0.03150 in.)

If the margin thickness is less than minimum, replace the valve.
(4)
Check the valve length.
Valve length
[Standard]
Intake : 108.378 mm (4.2669 in.)
Exhaust :119.878 mm (4.7196 in.)
[Limit]
Intake : 108.228 mm (4.2609 in.)
Exhaust : 119.728 mm (4.7137 in.)
(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
(1)
Check the valve seat for evidence of overheating and improper contact with the valve face. Replace the cylinder head if necessary.
(2)
Check the valve guide for wear. If the valve guide is worn, replace the cylinder head.
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 : 52.51 mm (2.0673 in.)
Out-of-square : Less than 1.5°

If the free length is not as specified, replace the valve spring.
Reassembly
  
•
Thoroughly clean all parts to be assembled.
Before installing the parts, apply fresh engine oil to all sliding and rotating surfaces.
Replace oil seals with new ones.
1.
Install valves.
(1)
After applying engine oil to the valve stem seal, install a new valve stem seal using the special tool (09222-2B100).

  
•
Always use new valve stem seals.
•
Incorrect installation of the seal could result in oil leakage past the valve guides.
(2)
Install the valve, valve spring and spring retainer.
  
•
Place valve springs so that the side coated with enamel faces toward the valve spring retainer and then installs the retainer.
(3)
Using the SST (09222-3K000, 09222-3K100), compress the spring and install the retainer locks. After installing the valves, ensure that the retainer locks are correctly in place before releasing the valve spring compressor.
(4)
Lightly tap the end of each valve stem two or three times with the wooden handle of a hammer to ensure proper seating of the valve and retainer lock.
2.
Install the MLAs after appling engine oil.
Installation
  
•
Thoroughly clean all parts to be assembled.
•
Always use a new cylinder head gasket and manifold gasket.
•
Always use a new cylinder head bolt and cylinder head bolt washer.
•
The cylinder head and exhaust manifold is a metal gasket. Take care not to bend it.
•
Turn the crankshaft pulley so that the No. 1 piston is at top dead center.
1.
Install the cylinder head.
(1)
Remove hardening sealant, oil, dust, moisture and harmful foreign materials from the cylinder block and the cylinder head.
(2)
Apply liquid sealant on the upper surface of the cylinder block.
Width : 2.0 - 3.0 mm (0.0787 - 0.1181 in.)
Specification : MS721-40 TYPE "AA" or "AAO"

(3)
Install the cylinder head gasket (A) to the cylinder block.

  
•
Be careful of the installation direction.
(4)
Apply liquid sealant on the upper surface of the cylinder head gasket.
Width : 2.0 - 3.0 mm (0.0787 - 0.1181 in.)
Specification : MS721-40 TYPE "AA" or "AAO"

2.
Install the cylinder head assembly.
(1)
Place the cylinder head assembly (A) quietly in order not to damage the gasket with the bottom part of the end.
(2)
Using SST (09221-4A000), tighten the cylinder head bolts and plate washers, in several passes, in the sequence shown.
Tightening torque :
32.4 - 36.3 N.m (3.3 - 3.7 kgf.m, 23.9 - 26.8 lb-ft) + [90° - 94°] + [110° - 114°]

  
•
Do not reuse the cylinder head bolts.
•
Do not apply engine oil on the bolt threads to achieve correct torque.
•
Remove the extruded sealant within 5 minutes after installing cylinder head bolts.
•
The engine running or pressure test should not be performed within 30minutes after installing cylinder head bolts.
•
Be careful not to change the installing position of the preassembled washer bolts and non-preassembled washer bolts.
3.
Install the spark plugs.
(Refer to Engine Electrical System - "Spark Plug")
4.
Install the hydraulic lash adjuster (HLA) (A) and the swing arm (B).
5.
Install the cam carrier to the cylinder head.
(1)
Remove hardening sealant, oil, dust, moisture and harmful foreign materials from the bottom surface of the cam carrier and top surface of the cylinder head.
(2)
After applying liquid sealant on the bottom surface of the cam carrier, Continuous bead of sealant should be applied to prevent any path from oil leakage.
Width : 2.0 - 3.0 mm (0.0787 - 0.1181 in.)
Specification : MS721-40 TYPE "AA" or "AAO"

  
•
When installing the cam carrier to the cylinder head, make sure to prevent the sealant from entering the hole (A) and the positive crankcase ventilation (PCV).
6.
Install the cam carrier (A).
Tightening torque :
18.6 - 22.6 N.m (1.9 - 2.3 kgf.m, 13.7 - 16.6 lb-ft)

  
•
Assemble the cam carrier within 5 minutes after applying sealant.
•
Assemble the camshaft bearing cap within 5 minutes after assembling the cam carrier.
•
The engine running or pressure test should not be performed within 30 minutes after assembling the cam carrier.
•
After installing the cam carrier to the cylinder head, check whether there are sealants in the hole of the oil level gauge and the positive crankcase ventilation (PCV).
7.
Install the intake CVVT & camshaft assembly (A).
8.
Install the exhaust CVVT & camshaft assembly (A).
9.
Install the camshaft front bearing cap (A) and camshaft bearing caps (B).

  
•
When installing the camshaft front bearing cap and camshaft bearing caps, tighten the bolts and nuts with pre-torque first, and then tighten the bolts and nuts with specified torque in the sequence shown.
Tightening torque :
Step 1
M8 Bolts : 9.8 - 11.8 N.m (1.0 - 1.2 kgf.m, 7.2 - 8.7 lb-ft)
M6 Bolts : 4.9 - 7.8 N.m (0.5 - 0.8 kgf.m, 3.6 - 5.8 Ib-ft)
Step 2
M8 Bolts : 18.6 - 22.6 N.m (1.9 - 2.3 kgf.m, 13.7 - 16.6 lb-ft)
M6 Bolts : 11.8 - 13.7 N.m (1.2 - 1.4 kgf.m, 8.7 - 10.1 lb-ft)
10.
Install the other parts in the reverse order of removal.
11.
Fill with engine coolant.
(Refer to Cooling System - "Coolant")
12.
Refill engine with engine oil.
(Refer to Lubrication System - "Engine Oil")

    CVVT & Camshaft. Repair procedures

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