‹

Cylinder Head Assembly

Engine, Cooling and Exhaust › Engine
Unified entry — merged from multiple cross-listed pages in the original manual.

Parts

PartRight
ManufacturerCHY
OEM part #RL020988AC
Price$305.00
PartLeft
ManufacturerCHY
OEM part #RL020987AD
Price$995.00

Labor

Replace — Right Bank8.9 hr
Warranty 0.0 hrSkill A
Left Bank9.8 hr
Warranty 0.0 hrSkill A
Both Banks13.0 hr
Warranty 0.0 hrSkill A
Procedures
Cylinder Head Assembly: Specificationsreference
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LEFT CYLINDER HEAD Tighten the bolts in sequence using the following steps and torque values: Step 1: Tighten bolts 1-8 27 Nm (20 ft. lbs.) Step 2: Verify that bolts 1-8 all reached 27 Nm (20 ft. lbs.) By repeating step-1 without loosening the bolts. Tighten bolts 9 through 12 14 Nm (10 ft. lbs.) Step 3: Tighten bolts 1-8 90 degrees Step 4: Tighten bolts 1-8 90 degrees, again. Tighten bolts 9-12 26 Nm (19 ft. lbs.) RIGHT CYLINDER HEAD Tighten the bolts in sequence using the following steps and torque values: Step 1: Tighten bolts 1-8 27 Nm (20 ft. lbs.). Step 2: Verify that bolts 1-8 all reached 27 Nm (20 ft. lbs.), by repeating step 1 without loosening the bolts. Step 3: Tighten bolts 9 thru 12 14 Nm (10 ft. lbs.). Step 4: Tighten bolts 1-8 90 °. Step 5: Tighten bolts 1-8 90 °, again. Step 6: Tighten bolts 9-12 26 Nm (19 ft. lbs.) BOLT RE-USABILITY The cylinder head bolts are tightened using a torque plus angle procedure. The bolts must be examined BEFORE reuse. If the threads are necked down the bolts should be replaced. SURFACE VARIATION If measurements exceed 0.0508 mm (0.002 in.) replace the cylinder head. CAMSHAFT BEARING CAP Tighten the camshaft bearing cap retaining bolts 11 Nm (100 in. lbs.) INTAKE MANIFOLD Intake Manifold Specifications EXHAUST MANIFOLD Exhaust Manifold Specifications CAMSHAFT GEAR/SPROCKET Camshaft Gear/Sprocket Specifications
Procedures — Cylinder Head - Cleaning — Rightreference
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CLEANING To ensure engine gasket sealing, proper surface preparation must be performed, especially with the use of aluminum engine components(Figure 1). Engine Gasket Surface Preparation.
Procedures — Cylinder Head - Cleaning — Leftreference
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CLEANING To ensure engine gasket sealing, proper surface preparation must be performed, especially with the use of aluminum engine components(Figure 1). Engine Gasket Surface Preparation.
Procedures — Cylinder Head - Inspection3 steps
  1. Inspect the cylinder head for out-of-flatness, using a straightedge and a feeler gauge. If measurements exceed 0.0508 mm (0.002 in.) replace the cylinder head.
  2. Inspect the valve seats for damage. Service the valve seats as necessary.
  3. Inspect the valve guides for wear, cracks or looseness. If either condition exist, replace the cylinder head.
Cylinder Head - Installation — Left Cylinder Head24 steps
ℹ NOTE
The cylinder head bolts are tightened using a torque plus angle procedure. The bolts must be examined BEFORE reuse. If the threads are necked down the bolts should be replaced.
△ CAUTION
When cleaning cylinder head and cylinder block surfaces, DO NOT use a metal scraper because the surfaces could be cut or ground. Use only a wooden or plastic scraper.
△ CAUTION
When installing cylinder head, use care not damage the tensioner arm or the guide arm.
ℹ NOTE
The four smaller cylinder head mounting bolts require sealant to be added to them before installing. Failure to do so may cause leaks.
ℹ NOTE
The cylinder head bolts are tightened using an angle torque procedure, however, the bolts are not a torque-to-yield design.
△ CAUTION
Remove excess oil from camshaft sprocket retaining bolt before reinstalling bolt. Failure to do so may cause over-torquing of bolt resulting in bolt failure.
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  1. Clean the cylinder head and cylinder block mating surfaces(Figure 2).
  2. Position the new cylinder head gasket on the locating dowels.
  3. Position the cylinder head onto the cylinder block. Make sure the cylinder head seats fully over the locating dowels.
  4. Lubricate the cylinder head bolt threads with clean engine oil and install the eight M11 bolts.
  5. Coat the four M8 cylinder head bolts with Mopar(R) Lock & Seal Adhesive then install the bolts.
  6. Tighten the bolts in sequence using the following steps and torque values: -Step 1: Tighten bolts 1-8, 27 Nm (20 ft. lbs.). -Step 2: Verify that bolts 1-8, all reached 27 Nm (20 ft. lbs.), by repeating step-1 without loosening the bolts. Tighten bolts 9 through 12 to 14 Nm (10 ft. lbs.). -Step 3: Tighten bolts 1-8, 90 degrees(Figure 3). -Step 4: Tighten bolts 1-8, 90 degrees, again. Tighten bolts 9-12, 26 Nm (19 ft. lbs.)
  7. Position the secondary chain onto the camshaft drive gear, making sure one marked chain link is on either side of the V6 mark on the gear then using Camshaft Holder , position the gear onto the camshaft.
  8. Install the camshaft drive gear retaining bolt.
  9. Install the left side secondary chain guide.
  10. Install the cylinder head access plug.
  11. Re-set and Install the left side secondary chain tensioner.
  12. Remove Secondary Camshaft Chain Holder.
  13. Install the timing chain cover.
  14. Install the crankshaft damper. Tighten damper bolt 175 Nm (130 Ft. Lbs.)
  15. Install the power steering pump.
  16. Install the fan blade assembly and fan shroud.
  17. Install the cylinder head cover.
  18. Install the intake manifold.
  19. Refill the cooling system
  20. Raise the vehicle.
  21. Install the exhaust pipe onto the left exhaust manifold.
  22. Lower the vehicle.
  23. Connect the negative cable to the battery.
  24. Start the engine and check for leaks.
Cylinder Head - Installation — Right Cylinder Head25 steps
ℹ NOTE
The cylinder head bolts are tightened using a torque plus angle procedure. The bolts must be examined BEFORE reuse. If the threads are necked down (2) the bolts should be replaced.
△ CAUTION
When cleaning cylinder head and cylinder block surfaces, DO NOT use a metal scraper (1), high speed scotch brite (2) or roloc tool (3) because the surfaces could be cut or ground. Use only a wooden or plastic scraper (4).
△ CAUTION
When installing cylinder head, use care not damage the tensioner arm or the guide arm.
ℹ NOTE
The four M8 cylinder head mounting bolts (1) require sealant to be added to them before installing. Failure to do so may cause leaks.
ℹ NOTE
The cylinder head bolts are tightened using an angle torque procedure, however, the bolts are not a torque-to-yield design.
△ CAUTION
Remove excess oil from camshaft sprocket retaining bolt before reinstalling bolt. Failure to do so may cause over-torquing of bolt resulting in bolt failure.
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  1. Clean the cylinder head and cylinder block mating surfaces.
  2. Position the new cylinder head gasket on the locating dowels.
  3. Position the cylinder head onto the cylinder block. Make sure the cylinder head seats fully over the locating dowels.
  4. Lubricate the cylinder head bolt threads with clean engine oil and install the eight M10 bolts.
  5. Coat the four M8 cylinder head bolts with Mopar Lock & Seal Adhesive then install the bolts.
  6. Tighten the bolts in sequence using the following steps and torque values: -Step 1: Tighten bolts 1-8, 27 Nm (20 ft. lbs.). -Step 2: Verify that bolts 1-8, all reached 27 Nm (20 ft. lbs.), by repeating step 1 without loosening the bolts. -Step 3: Tighten bolts 9 thru 12 to 14 Nm (10 ft. lbs.). -Step 4: Tighten bolts 1-8, 90 °. -Step 5: Tighten bolts 1-8, 90 °, again. -Step 6: Tighten bolts 9-12, 26 Nm (19 ft. lbs.).
  7. Position the secondary chain (2) onto the camshaft drive gear, making sure one marked chain link is on either side of the V6 mark (1) on the gear then using the Camshaft Holder , position the gear onto the camshaft.
  8. Install the camshaft drive gear retaining bolt.
  9. Install the right side secondary chain guide Timing Chain & Sprockets - Installation.
  10. Install the cylinder head access plug (1,2).
  11. Re-set and install the right side secondary chain tensionerTiming Chain & Sprockets - Installation.
  12. Remove the Camshaft Holder (1).
  13. Install the timing chain coverEngine Timing Cover(s) - Removal.
  14. Install the crankshaft damperVibration Damper - Installation. Tighten damper bolt 175 Nm (130 Ft. Lbs.).
  15. Install accessory drive beltSerpentine Accessory Drive Belt - Installation.
  16. Install the fan shroudElectric Radiator Fan - Installation.
  17. Install the cylinder head coverCylinder Head Cover(s) - Installation.
  18. Install the intake manifoldIntake Manifold - Installation.
  19. Install oil fill housing onto cylinder head.
  20. Refill the cooling systemService and Repair.
  21. Raise the vehicle.
  22. Install the exhaust pipe onto the right exhaust manifold.
  23. Lower the vehicle.
  24. Reconnect battery negative cable.
  25. Start the engine and check for leaks.
Cylinder Head - Removal — Left Cylinder Head22 steps
ℹ NOTE
Mark the secondary timing chain prior to removal to aid in installation.
△ CAUTION
Do not allow the engine to rotate. Severe damage to the valve train can occur.
△ CAUTION
Do not overlook the four smaller bolts at the front of the cylinder head. Do not attempt to remove the cylinder head without removing these four bolts.
ℹ NOTE
The cylinder head is attached to the cylinder block with twelve bolts.
△ CAUTION
Do not lay the cylinder head on its gasket sealing surface, due to the design of the cylinder head gasket any distortion to the cylinder head sealing surface may prevent the gasket from properly sealing resulting in leaks.
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  1. Disconnect the negative cable from the battery.
  2. Raise the vehicle on a hoist.
  3. Disconnect the exhaust pipe at the left side exhaust manifold.
  4. Drain the engine coolant. Refer to COOLING SYSTEM.
  5. Lower the vehicle.
  6. Remove the intake manifold.
  7. Remove the cylinder head cover.
  8. Remove the fan shroud and fan blade assembly. Refer to COOLING SYSTEM.
  9. Remove accessory drive belt. Refer to COOLING SYSTEM.
  10. Remove the power steering pump and set aside.
  11. Rotate the crankshaft until the damper timing mark is aligned with TDC indicator mark (2) (Figure 1).
  12. Verify the V6 mark on the camshaft sprocket is at the 12 o'clock position(Figure 2). Rotate the crankshaft one turn if necessary.
  13. Remove the crankshaft damper. Vibration Damper - Removal
  14. Remove the timing chain cover. Engine Timing Cover(s) - Removal
  15. Lock the secondary timing chains to the idler sprocket using Secondary Camshaft Chain Holder (1) (Figure 3).
  16. Mark the secondary timing chain, one link on each side of the V6 mark on the camshaft drive gear.
  17. Remove the left side secondary chain tensioner.
  18. Remove the cylinder head access plug (1) (2) (Figure 4).
  19. Remove the left side secondary chain guide.
  20. Remove the retaining bolt and the camshaft drive gear.
  21. Remove the cylinder head retaining bolts.
  22. Remove the cylinder head and gasket. Discard the gasket.
Cylinder Head - Removal — Right Cylinder Head22 steps
ℹ NOTE
Mark the secondary timing chain prior to removal to aid in installation.
△ CAUTION
The nut on the right side camshaft sprocket should not be removed for any reason, as the sprocket and camshaft sensor target wheel is serviced as an assembly. If the nut was removed, tighten nut to 5 Nm (44 in. lbs.).
△ CAUTION
Do not allow the engine to rotate. severe damage to the valve train can occur.
△ CAUTION
Do not overlook the four smaller bolts at the front of the cylinder head. Do not attempt to remove the cylinder head without removing these four bolts.
△ CAUTION
Do not hold or pry on the camshaft target wheel for any reason. A damaged target wheel can result in a vehicle no start condition.
ℹ NOTE
The cylinder head is attached to the cylinder block with twelve bolts.
△ CAUTION
Do not lay the cylinder head on its gasket sealing surface, do to the design of the cylinder head gasket any distortion to the cylinder head sealing surface may prevent the gasket from properly sealing resulting in leaks.
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  1. Disconnect battery negative cable.
  2. Raise the vehicle on a hoist.
  3. Disconnect the exhaust pipe at the right side exhaust manifold.
  4. Drain the engine coolantService and Repair
  5. Lower the vehicle.
  6. Remove the intake manifold. Intake Manifold - Removal
  7. Remove the cylinder head coverCylinder Head Cover(s) - Removal.
  8. Remove the fan shroudElectric Radiator Fan - Removal
  9. Remove oil fill housing from cylinder head.
  10. Remove accessory drive beltSerpentine Accessory Drive Belt - Removal.
  11. Rotate the crankshaft until the damper timing mark is aligned with TDC indicator mark. (Figure 1)(2).
  12. Verify the V6 mark on the camshaft sprocket is at the 12 o'clock position(Figure 2). Rotate the crankshaft one turn if necessary.
  13. Remove the crankshaft damper. Vibration Damper - Removal
  14. Remove the timing chain cover. Engine Timing Cover(s) - Removal.
  15. Lock the secondary timing chains to the idler sprocket using the Secondary Camshaft Chain Holder (Figure 3)(1).
  16. Mark the secondary timing chain, one link on each side of the V6 mark on the camshaft drive gear.
  17. Remove the right side secondary chain tensioner. Timing Chain & Sprockets - Removal.
  18. Remove the cylinder head access plug (Figure 4)(1,2).
  19. Remove the right side secondary chain guide. Timing Chain & Sprockets - Removal.
  20. Remove the retaining bolt and the camshaft drive gear.
  21. Remove the cylinder head retaining bolts(Figure 5).
  22. Remove the cylinder head and gasket. Discard the gasket.
Left - Hydraulic Lash Adjuster11 steps
  1. Engine oil level too high or too low. This may cause aerated oil to enter the adjusters and cause them to be spongy.
  2. Insufficient running time after rebuilding cylinder head. Low speed running up to 1 hour may be required.
  3. Turn engine off and let set for a few minutes before restarting. Repeat this several times after engine has reached normal operating temperature.
  4. Low oil pressure.
  5. The oil restrictor in cylinder head gasket or the oil passage to the cylinder head is plugged with debris.
  6. Air ingested into oil due to broken or cracked oil pump pick up.
  7. Worn valve guides.
  8. Rocker arm ears contacting valve spring retainer.
  9. Rocker arm loose, adjuster stuck or at maximum extension and still leaves lash in the system.
  10. Oil leak or excessive cam bore wear in cylinder head.
  11. Faulty lash adjuster. -Check lash adjusters for sponginess while installed in cylinder head and cam on camshaft at base circle. Depress part of rocker arm over adjuster. Normal adjusters should feel firm when pressed quickly. When pressed very slowly, lash adjusters should collapse. -Remove suspected lash adjusters, and replace. -Before installation, make sure adjusters are full of oil. This can be verified by little plunger travel when lash adjuster is depressed quickly.
Right - Hydraulic Lash Adjuster11 steps
  1. Engine oil level too high or too low. This may cause aerated oil to enter the adjusters and cause them to be spongy.
  2. Insufficient running time after rebuilding cylinder head. Low speed running up to 1 hour may be required.
  3. Turn engine off and let set for a few minutes before restarting. Repeat this several times after engine has reached normal operating temperature.
  4. Low oil pressure.
  5. The oil restrictor in cylinder head gasket or the oil passage to the cylinder head is plugged with debris.
  6. Air ingested into oil due to broken or cracked oil pump pick up.
  7. Worn valve guides.
  8. Rocker arm ears contacting valve spring retainer.
  9. Rocker arm loose, adjuster stuck or at maximum extension and still leaves lash in the system.
  10. Oil leak or excessive cam bore wear in cylinder head.
  11. Faulty lash adjuster. -Check lash adjusters for sponginess while installed in cylinder head and cam on camshaft at base circle. Depress part of rocker arm over adjuster. Normal adjusters should feel very firm. Spongy adjusters can be bottomed out easily. -Remove suspected lash adjusters, and replace. -Before installation, make sure adjusters are at least partially full of oil. This can be verified by little or no plunger travel when lash adjuster is depressed.
Right - Cylinder Head Gasketreference
⚠ WARNING
USE EXTREME CAUTION WHEN THE ENGINE IS OPERATING WITH COOLANT PRESSURE CAP REMOVED.
⚠ WARNING
WITH COOLING SYSTEM TESTER IN PLACE, PRESSURE WILL BUILD UP FAST. EXCESSIVE PRESSURE BUILT UP, BY CONTINUOUS ENGINE OPERATION, MUST BE RELEASED TO A SAFE PRESSURE POINT. NEVER PERMIT PRESSURE TO EXCEED 138 kPa (20 psi).
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CYLINDER HEAD GASKET Special Tools: A cylinder head gasket leak can be located between adjacent cylinders or between a cylinder and the adjacent water jacket. Possible indications of the cylinder head gasket leaking between adjacent cylinders are: -Loss of engine power -Engine misfiring -Poor fuel economy Possible indications of the cylinder head gasket leaking between a cylinder and an adjacent water jacket are: -Engine overheating -Loss of coolant -Excessive steam (white smoke) emitting from exhaust -Coolant foaming CYLINDER-TO-CYLINDER LEAKAGE TEST To determine if an engine cylinder head gasket is leaking between adjacent cylinders, follow the procedures in Cylinder Compression Pressure Test Cylinder Compression Pressure Test. An engine cylinder head gasket leaking between adjacent cylinders will result in approximately a 50 - 70% reduction in compression pressure. CYLINDER-TO-WATER JACKET LEAKAGE TEST VISUAL TEST METHOD With the engine cool, remove the coolant pressure cap. Start the engine and allow it to warm up until thermostat opens. If a large combustion/compression pressure leak exists, bubbles will be visible in the coolant. COOLING SYSTEM TESTER METHOD Install Cooling System Tester or equivalent to pressure cap neck. Start the engine and observe the tester's pressure gauge. If gauge pulsates with every power stroke of a cylinder a combustion pressure leak is evident. CHEMICAL TEST METHOD Combustion leaks into the cooling system can also be checked by using Bloc-Check Kit or equivalent. Perform test following the procedures supplied with the tool kit.
Left - Cylinder Head Gasketreference
⚠ WARNING
USE EXTREME CAUTION WHEN THE ENGINE IS OPERATING WITH COOLANT PRESSURE CAP REMOVED.
⚠ WARNING
WITH COOLING SYSTEM TESTER IN PLACE, PRESSURE WILL BUILD UP FAST. EXCESSIVE PRESSURE BUILT UP, BY CONTINUOUS ENGINE OPERATION, MUST BE RELEASED TO A SAFE PRESSURE POINT. NEVER PERMIT PRESSURE TO EXCEED 138 kPa (20 psi).
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CYLINDER HEAD GASKET Special Tools: A cylinder head gasket leak can be located between adjacent cylinders or between a cylinder and the adjacent water jacket. Possible indications of the cylinder head gasket leaking between adjacent cylinders are: -Loss of engine power -Engine misfiring -Poor fuel economy Possible indications of the cylinder head gasket leaking between a cylinder and an adjacent water jacket are: -Engine overheating -Loss of coolant -Excessive steam (white smoke) emitting from exhaust -Coolant foaming CYLINDER-TO-CYLINDER LEAKAGE TEST To determine if an engine cylinder head gasket is leaking between adjacent cylinders, follow the procedures in Cylinder Compression Pressure Test Cylinder Compression Pressure Test. An engine cylinder head gasket leaking between adjacent cylinders will result in approximately a 50 - 70% reduction in compression pressure. CYLINDER-TO-WATER JACKET LEAKAGE TEST VISUAL TEST METHOD With the engine cool, remove the coolant pressure cap. Start the engine and allow it to warm up until thermostat opens. If a large combustion/compression pressure leak exists, bubbles will be visible in the coolant. COOLING SYSTEM TESTER METHOD Install Cooling System Tester or equivalent to pressure cap neck. Start the engine and observe the tester's pressure gauge. If gauge pulsates with every power stroke of a cylinder a combustion pressure leak is evident. CHEMICAL TEST METHOD Combustion leaks into the cooling system can also be checked by using Bloc-Check Kit or equivalent. Perform test following the procedures supplied with the tool kit.
Factory service manual
From the 2008 KK factory manual — descriptions, specs, torque & procedures for this part.
CYLINDER HEAD GASKET
A cylinder head gasket leak can be located between adjacent cylinders or between a cylinder and the adjacent water jacket.
Possible indications of the cylinder head gasket leaking between adjacent cylinders are:
 Loss of engine power  Engine misfiring
 Poor fuel economy
Possible indications of the cylinder head gasket leaking between a cylinder and an adjacent water jacket are:
 Engine overheating  Loss of coolant
 Excessive steam (white smoke) emitting from exhaust
 Coolant foaming
CYLINDER HEADS📷 3
1 - PLASTIC/WOOD SCRAPER
To ensure engine gasket sealing, proper surface preparation must be performed, especially with the use of aluminum engine components. See Fig. 52. See STANDARD PROCEDURE.

Installation

1 - STRETCHED BOLT 2 - THREADS ARE NOT STRAIGHT ON LINE 3 - THREADS ARE STRAIGHT ON LINE 4 - UNSTRETCHED BOLT
NOTE: The cylinder head bolts are tightened using a torque plus angle procedure. The bolts must be examined BEFORE reuse. If the threads are necked down the bolts should be replaced.
Necking can be checked by holding a straight edge against the threads. If all the threads do not contact the scale
(1), the bolt should be replaced. See Fig. 53.
1 - PLASTIC/WOOD SCRAPER
CAUTION: When cleaning cylinder head and cylinder block surfaces, DO NOT use a metal scraper because the surfaces could be cut or ground. Use only a wooden or plastic scraper.
1
Clean the cylinder head and cylinder block mating surfaces. See Fig. 54.
2
Position the new cylinder head gasket on the locating dowels.
CAUTION
When installing cylinder head, use care not damage the tensioner
arm or the guide arm.
3
Position the cylinder head onto the cylinder block. Make sure the cylinder head seats fully over the
locating dowels.
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CYLINDER HEAD
The cylinder heads are made of an aluminum alloy. The cylinder head features two valves per cylinder with pressed in powdered metal valve guides. The cylinder heads also provide enclosures for the timing chain drain, necessitating unique left and right cylinder heads.
CYLINDER HEAD GASKET
A cylinder head gasket leak can be located between adjacent cylinders or between a cylinder and the adjacent water jacket.
Possible indications of the cylinder head gasket leaking between adjacent cylinders are:
 Loss of engine power  Engine misfiring
 Poor fuel economy
Possible indications of the cylinder head gasket leaking between a cylinder and an adjacent water jacket are:
 Engine overheating  Loss of coolant
 Excessive steam (white smoke) emitting from exhaust
 Coolant foaming
CYLINDER HEAD - RIGHT📷 4
1 - TIMING CHAIN COVER 2 - CRANKSHAFT TIMING MARKS
 1.   Disconnect battery negative cable.
 2.   Raise the vehicle on a hoist.
 3.   Disconnect the exhaust pipe at the right side exhaust manifold.
 4.   Drain the engine coolant. Refer to STANDARD PROCEDURE .
 5.   Lower the vehicle.
 6.   Remove the intake manifold. See REMOVAL.
 7.   Remove the cylinder head cover. See REMOVAL.
 8.   Remove the fan shroud. Refer to REMOVAL .
 9.   Remove oil fill housing from cylinder head.
10.   Remove accessory drive belt. Refer to REMOVAL .
11.   Rotate the crankshaft until the damper timing mark is aligned with TDC indicator mark (2). See Fig. 68.
12. Verify the V6 mark on the camshaft sprocket is at the 12 o'clock position. See Fig. 69. Rotate the crankshaft one turn if necessary. 13. Remove the crankshaft damper. See REMOVAL. 14. Remove the timing chain cover. See REMOVAL.
1 - SPECIAL TOOL 8429 2 - CAMSHAFT CHAIN 3 - CRANKSHAFT TIMING GEAR
15. Lock the secondary timing chains to the idler sprocket using the Secondary Camshaft Chain Holder 8429 (1). See Fig. 70.
NOTE: Mark the secondary timing chain prior to removal to aid in installation.
16. Mark the secondary timing chain, one link on each side of the V6 mark on the camshaft drive gear.
17. Remove the right side secondary chain tensioner. See REMOVAL.
1 - RIGHT CYLINDER HEAD ACCESS PLUG 2 - LEFT CYLINDER HEAD ACCESS PLUG
18. Remove the cylinder head access plug (1,2). See Fig. 71. 19. Remove the right side secondary chain guide. See REMOVAL.
CAUTION: The nut on the right side camshaft sprocket should not be removed for any reason, as the sprocket and camshaft sensor target wheel is serviced as an assembly. If the nut was removed, tighten nut to 5 N.m (44 in. lbs.).
20. Remove the retaining bolt and the camshaft drive gear.
CAUTION: Do not allow the engine to rotate. severe damage to the valve train can occur.
CAUTION: Do not overlook the four smaller bolts at the front of the cylinder head. Do not attempt to remove the cylinder head without removing these four bolts.
CAUTION: Do not hold or pry on the camshaft target wheel for any reason. A damaged target wheel can result in a vehicle no start condition.
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CYLINDER HEADS📷 1
1 - PLASTIC/WOOD SCRAPER
To ensure engine gasket sealing, proper surface preparation must be performed, especially with the use of aluminum engine components. See Fig. 73. See STANDARD PROCEDURE.
figure
CYLINDER HEADS📷 1
1. Inspect the cylinder head for out-of-flatness, using a straightedge and a feeler gauge. If measurements exceed 0.0508 mm (0.002 in.) replace the cylinder head. 2. Inspect the valve seats for damage. Service the valve seats as necessary. 3. Inspect the valve guides for wear, cracks or looseness. If either condition exist, replace the cylinder head.
figure
CYLINDER HEAD - RIGHT📷 2
NOTE: The cylinder head bolts are tightened using a torque plus angle procedure. The bolts must be examined BEFORE reuse. If the threads are necked down (2) the bolts should be replaced.
Necking can be checked by holding a straight edge against the threads. If all the threads do not contact the scale, the bolt should be replaced. See Fig. 74.
1 - PLASTIC/WOOD SCRAPER
CAUTION: When cleaning cylinder head and cylinder block surfaces, DO NOT use a metal scraper because the surfaces could be cut or ground. Use only a wooden or plastic scraper (1).
1. Clean the cylinder head and cylinder block mating surfaces. See Fig. 75.
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