• Camshaft Position Sensor Seal
• Valve Stem Oil Seal

• EN-840 Pliers / Remover
• EN-50717 Valve Spring Compressor
• EN-50717-20 Valve Spring Compressor Adapter Set

Equivalent regional tools:Special Tools.

Cylinder Head»Remove—Cylinder Head Replacement

1. Fuel Injection Fuel Rail Stud(1)»Remove[3x]



2. Camshaft Housing Cover Locating Pin(1)»Remove
3. Cylinder Head Temperature Sensor(2)»Remove
4. Engine Lift Bracket Retainer(3)»Remove



5. Camshaft Housing Cover Locating Pin(1)»Remove
6. Cylinder Head Core Hole Plug(2)»Remove[2x]
7. Camshaft Position Sensor Bolt(5)»Remove
8. Camshaft Position Sensor(4)»Remove
9. Camshaft Position Sensor Seal(3)»Remove and DISCARD
10. Engine Lift Bracket Retainer(6)»Remove



11. Assemble the EN-50717 Valve Spring Compressor components (1) with the EN-50717–20 Valve Spring Compressor Adapter Set (2).
12. Install the assembled EN-50717 Valve Spring Compressor components on the cylinder head.




Warning: Compressed valve springs have high tension against the valve spring compressor. Valve springs that are not properly compressed by or released from the valve spring compressor can be ejected from the valve spring compressor with intense force. Use care when compressing or releasing the valve spring with the valve spring compressor and when removing or installing the valve stem keys. Failing to use care may cause personal injury.

Note:

• Many internal engine components will develop specific wear patterns on their friction surfaces.
• Components MUST be separated, marked, or organized in a way to ensure the installation to their original location and position. Take precautions in order to prevent interchanging of parts.
• Tag or mark each part immediately when removed. Indicate the location, direction, or orientation when necessary.

13. Align the EN-50717 Valve Spring Compressor (1) with the first valve spring retainer (2) to be removed.
14. Using EN-50717 Valve Spring Compressor (1), compress the valve spring.
15. Valve Stem Key(4)»Remove[2x]
16. Slowly release the EN-50717 Valve Spring Compressor from the valve spring assembly.
17. Valve Spring Retainer(2)»Remove
18. Valve Spring(3)»Remove




Caution: Do not damage the valve guide. Remove any burrs that have formed at the key groove by chamfering the valve stem with an oil stone or a file.

19. Using EN-840 Pliers / Remover, remove the valve stem oil seal (1). Discard all used seals and replace with new.
20. Intake Valve(2)»Remove
21. Repeat the procedure for the remaining intake valves and exhaust valves.
22. Remove the EN-50717 Valve Spring Compressor components.

1. Remove any old sealant or gasket material.
2. Clean all cylinder head surfaces with non-corrosive cleaning solvent.

Warning: Refer to Safety Glasses Warning.

3. Blow out all the oil galleries using compressed air.
4. Remove any carbon deposits from the combustion chamber (2).
5. Inspect the cylinder head sealing surface for flatness using a straightedge (1). If the cylinder head sealing surface is uneven, replace the cylinder head. Do NOT machine the cylinder head.
6. Inspect all the threaded holes for damage. Threads may be reconditioned with thread inserts.
7. Inspect the cylinder head camshaft bearing surfaces for the following conditions:
1. Excessive scoring or pitting.
2. Discoloration from overheating.
3. Deformation from excessive wear.
8. If any of the above conditions exist on the camshaft bearing surfaces, replace the cylinder head.



9. Inspect the cylinder head (1) for the following:
1. Cracks, damage, or pitting in the combustion chambers.
2. Debris in the oil galleries, continue to clean the galleries until all debris is removed.
3. Coolant leaks or damage to the deck face sealing surface, if coolant leaks are present, measure the surface warpage as described under cylinder head measurement deck flatness inspection.
4. Damage to any gasket surfaces.
5. Burnt or eroded areas in the combustion chamber.
6. Cracks in the exhaust ports (3) and combustion chambers.
7. External cracks in the water passages.
8. Restrictions in the intake or exhaust ports (3) .
9. Restrictions in the cooling system passages.
10. Rusted, damaged or leaking core plugs.
10. Inspect the exterior of the camshaft housing ladder frame (2) for the following conditions:
1. Damage to the camshaft housing ladder frame (4) bolt holes.
2. Damage to the injector bore holes.
3. Damage to the oil passages.
11. Inspect the interior of the camshaft housing ladder frame (2) for the following conditions:
1. Inspect the camshaft housing ladder frame (2), casting imperfections, cracks or damage.
2. Inspect the camshaft housing ladder frame (2) seal locations (1) for cracks or damage.
12. If the cylinder head (1) or ladder frame (2) is cracked or damaged, they must be replaced. No welding or patching of the is allowed.

1. Clean the valves of carbon and oil. Carbon can be removed with a wire brush.
2. Inspect the valves for the following conditions:
1. Inspect the valve faces for burning and cracking (1). If pieces are broken, replace the valve and inspect the corresponding piston and cylinder head area for damage.
2. Inspect the valve for straightness and distortion (2). A distorted valve must be replaced.
3. Inspect the valve stem for wear (3).
4. Inspect the valve key grooves for chipping (4) and valve stem tip (5). Replace the valve if chipped or worn.



3. Using a slide gauge (1), measure the valve length. Engine Mechanical Specifications



4. Using a micrometer gauge (2), measure the valve stem diameter. Engine Mechanical Specifications

1. Assemble the EN-50717 Valve Spring Compressor components (1) with the EN-50717–20 Valve Spring Compressor Adapter Set (2).
2. Install the assembled EN-50717 Valve Spring Compressor components on the cylinder head.




Caution: Do not damage the valve guide. Remove any burrs that have formed at the key groove by chamfering the valve stem with an oil stone or a file.

3. Intake Valve(2)»Install
4. Using EN-840 Pliers / Remover, install a NEW valve stem oil seal (1).



5. Valve Spring(3)»Install
6. Valve Spring Retainer(2)»Install

Warning: Compressed valve springs have high tension against the valve spring compressor. Valve springs that are not properly compressed by or released from the valve spring compressor can be ejected from the valve spring compressor with intense force. Use care when compressing or releasing the valve spring with the valve spring compressor and when removing or installing the valve stem keys. Failing to use care may cause personal injury.

Note: Components MUST be separated, marked, or organized in a way to ensure the installation to their original location and position. Take precautions in order to prevent interchanging of parts.

7. Using the EN-50717 Valve Spring Compressor (1), compress the valve spring.
8. Valve Stem Key(4)»Install[2x]
9. Slowly release the EN-50717 Valve Spring Compressor from the valve spring assembly.
10. Repeat the procedure for the remaining intake valves and exhaust valves.
11. Remove the EN-50717 Valve Spring Compressor components.



12. Camshaft Position Sensor Seal(3)»Install NEW
13. Camshaft Position Sensor(4)»Install

Caution: Refer to Fastener Caution.

14. Camshaft Position Sensor Bolt(5)»Install and tighten—Fastener Specifications
15. Cylinder Head Core Hole Plug(2)»Install[2x]
16. Engine Lift Bracket Retainer(6)»Install
17. Camshaft Housing Cover Locating Pin(1)»Install



18. Cylinder Head Temperature Sensor(2)»Install and tighten—Fastener Specifications
19. Engine Lift Bracket Retainer(3)»Install
20. Camshaft Housing Cover Locating Pin(1)»Install



21. Fuel Injection Fuel Rail Stud(1)»Install and tighten[3x]—Fastener Specifications

Cylinder Head»Install—Cylinder Head Replacement