Cylinder head disassembly (RZ4E-TC)

1. Component views

Cylinder head

Part name

  1. Valve stem end cap
  2. Split collar
  3. Spring upper seat
  4. Valve spring
  5. Valve stem oil seal
  6. Spring lower seat
  7. Valve
  8. Cylinder head bolt
  9. Bolt
  10. Cylinder head
  11. Cylinder head gasket
  12. HLA
  13. Rocker arm

Tightening torque

8-1: 115 N・m { 11.7 kgf・m / 85 lb・ft }

8-2: 115 N・m { 11.7 kgf・m / 85 lb・ft }

8-3: 90 to 120 °

8-4: 90 to 120 °

9: 25 N・m { 2.5 kgf・m / 18 lb・ft }

2. CMP sensor removal

1) Remove the fuel pipe bracket from the cylinder head.

Legend

  1. Fuel pipe bracket
  2. CMP sensor
  3. Cylinder head

2) Remove the CMP sensor from the cylinder head.

Legend

  1. O-ring
  2. CMP sensor

3. Rocker arm removal

1) Remove the rocker arm from the HLA and valve stem end cap.

Legend

  1. Rocker arm
  2. Valve stem end cap
  3. HLA

4. HLA removal

1) Remove the HLA from the cylinder head.

Legend

  1. HLA
  2. Cylinder head

2) Submerge the HLA into the container which contains the engine oil.

Caution

  • Do not lay the removed HLA on its side, but store the HLA standing upright.
  • Use new engine oil.

5. Valve spring removal

1) Remove the valve stem end cap from the valve stem.

2) Remove the split collar from the valve using the special tool.


SST: 5-8840-3171-0 - valve spring compressor

3) Remove special tool from the cylinder head.

4) Remove the upper spring seat from the valve spring.

5) Remove the valve spring from the cylinder head.

6) Apply number tags to the valve springs.

6. Valve removal

1) Remove the inlet valve and the exhaust valve from the cylinder head.

Note

  • Store the removed valves with the number tags.

7. Valve stem oil seal removal

1) Remove the valve stem oil seal from the cylinder head using pliers.

Caution

  • Do not reuse the valve stem oil seal.

2) Remove the lower spring seat from the cylinder head.

8. Valve seat insert removal

1) Arc weld the entire inner circumference of the valve seat insert.

2) Cool the valve seat insert for about 3 minutes.

Note

  • The valve seat insert becomes easier to remove due to the contraction caused by cooling.

Caution

  • Do not damage the cylinder head.

Legend

  1. Arc welding
  2. Valve seat insert
  3. Welding rod

9. Valve guide removal

1) Tap out the valve guides from the lower side of the cylinder head using the special tool.


SST: 5-8840-3172-0 - valve guide remover and installer

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