CYLINDER HEAD INSPECTION/REPAIR [WLT-1, WLT-2, WL-3]

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1. Inspect the cylinder head surface for cracks. Replace the cylinder head if necessary.

2. Inspect for the following and repair or replace.

(1) Sunken valve seats

(2) Excessive camshaft oil clearance and end play

3. Measure the cylinder head for distortion in the seven directions as shown in the figure.

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Maximum cylinder head distortion

X distortion: 0.02 mm {0.0008 in}

Y distortion: 0.05 mm {0.0020 in}

4. Measure the receded or projected amount of combustion chamber insert from the cylinder head surface.

• If it exceeds the maximum specification, replace the cylinder head.

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Maximum combustion chamber recession

0.02 mm {0.0008 in}

Maximum combustion chamber projection

0.005 mm {0.0002 in}

5. Inspect the combustion chamber insert crack.

• If it exceeds the limit specification, replace the cylinder head.

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Combustion chamber crack

Limit: 10mm {0.39 in}

6. Measure the manifold contact surface distortion as shown in the figure.

• If the distortion exceeds the maximum specification, grind the surface or replace the cylinder head.

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Maximum manifold contact surface distortion

0.05 mm {0.0020 in}

Maximum manifold contact surface grinding

0.15 mm {0.0059 in}