Doosan G25P-5 Service Manual download pdf (Page 81)

G424F(FE) Service Manual Chapter 3. Engine Mechanical System 79

Tighten

• Nuts: 18 – 22 N·m (13 – 16 lb·ft.)

Obs.: Tighten the intake manifold nuts in a

crisscross sequence, from the center to the ends.

7. Camshaft case assembly; see “Camshaft Case

Assembly – Installation”, in this section.

Valve, Spring or Seal

Removal

Remove or disconnect

1. Camshaft case assembly, as per instructions

under “Camshaft Case Assembly – Removal”, in

this section.

2. Intake manifold-to-cylinder head nuts, with a 13-

mm socket wrench, extension and handle and

remove the manifold.

3. Exhaust manifold-to-cylinder head nuts, with a 13-

mm socket wrench, extension and handle; remove

the exhaust manifold.

4. Valve lock, with the aid of valve spring

compressor.

5. Spring plate.

6. Spring.

7. Seal, with seal pliers.

8. Valve.

Inspect

• Cylinder head for cracks in the exhaust

passages and combustion chambers.

• Valves for head burning, face cracks and

damaged stems.

• Stem lash in the guide, as follows:

Measure the stem diameter in the upper, center

and lower areas.

With the telescope gauge in the valve guide,

measure in the upper, center and lower areas. The

difference in the guide and stem measurements is

the lash.

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Doosan G25P-5 Service Manual Page 81