Inspection After Removal

Camshaft Visual Check 

Check camshaft for scratches, seizure and wear. Replace if necessary.

Camshaft Runout 

1. Put V-block on precise flat bed and support No. 2 and No. 4 journal of camshaft as shown, below.

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2. Set dial gauges vertically to No. 3 journal as shown, above.
3. Turn camshaft in one direction slowly by hand, measure the camshaft runout on the dial gauges.
   • Runout is the largest indicator reading after one full revolution. Refer to Camshaft .
4. If actual runout exceeds the limit, replace the camshaft.

Camshaft Cam Lobe Height 

1. Measure camshaft cam lobe height as shown, below. Refer to Camshaft .

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2. If wear has reduced the lobe height below specifications, replace the camshaft.

Camshaft Journal Clearance 

Outer Diameter of Camshaft Journal 

• Measure outer diameter of camshaft journal as shown, below. Refer to Camshaft .

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Inner Diameter of Camshaft Bracket 

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1. Tighten camshaft bracket bolt with specified torque.
2. Using inside micrometer, measure inner diameter (A) of camshaft bearing. Refer to Camshaft .

   Calculation of Camshaft Journal Clearance 

   (Journal clearance) = (inner diameter of camshaft bracket) - (outer diameter of camshaft journal). Refer to Camshaft .

   • When out of the specified range, replace either or both camshaft and cylinder head.
     NOTE: Inner diameter of camshaft bracket is manufactured together with cylinder head. Replace the whole cylinder head assembly.

Camshaft End Play 

1. Install the camshaft in the cylinder head.
2. Install dial gauge in thrust direction on front end of camshaft. Measure end play when camshaft is moved forward/backward (in direction to axis) as shown, below. Refer to Camshaft .

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   • If out of the specified range, replace with new camshaft and measure again.
   • If out of the specified range again, replace with new cylinder head.

Camshaft Sprocket Runout 

1. Put V-block on precise flat bed and support No. 2 and No. 4 journal of camshaft as shown, below.

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2. Install camshaft sprocket on camshaft.
3. Measure camshaft sprocket runout. Refer to Camshaft .
4. If sprocket runout exceeds the limit, replace camshaft sprocket.

Valve Lifter 

• Check if the surface of the valve lifter has any excessive wear or cracks, replace as necessary.

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Valve Lifter Clearance 

Outer Diameter of Valve Lifter 

• Measure the outer diameter of the valve lifter with a suitable tool (A). Refer to Camshaft .

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• If out of the specified range, replace the valve lifter.

Valve Lifter Bore Diameter 

• Using inside micrometer, measure diameter of valve lifter bore of cylinder head. Refer to Camshaft .

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• If out of the specified range, replace the cylinder head assembly.

Calculation of Valve Lifter Clearance 

• (Valve lifter clearance) = (hole diameter for valve lifter) - (outer diameter of valve lifter) Refer to Camshaft .
• If out of specified range, replace either or both valve lifter and cylinder head assembly.