Engine Mechanical (H4DOTC): Camshaft: Inspection

1. Limit: 0.020 mm (0.0008 in) 

Fig 1: Measuring Outside Diameter Of Camshaft Journal

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1. Clean the bearing caps and camshaft journals.
2. Place the camshafts on cylinder head. (Without installing the valve rocker.)
3. Place a plastigage across each of the camshaft journals.
4. Gradually tighten the cap in at least two stages in alphabetical sequence shown in the figure, and then tighten to specified torque. Do not turn the camshaft.

   Tightening torque: 

   1. T1: 10 N.m (1.0 kgf-m, 7.2 ft-lb) 
   2. T2: 20 N.m (2.0 kgf-m, 14.5 ft-lb) 
   Fig 3: Tightening Camshaft Cap Bolts

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5. Remove the bearing caps.
6. Measure the widest point of plastigage on each journal. If the oil clearance exceeds the limit, replace the camshaft. If necessary, replace the camshaft caps and cylinder head as a set.
   1. Standard: 0.037 - 0.072 mm (0.0015 - 0.0028 in) 
   2. Limit: 0.10 mm (0.0039 in) 
   Fig 4: Measuring Widest Point Of Plastigage On Each Journal

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7. Completely remove the plastigage.

Cam height: H 

Standard: 

1. Intake: 46.55 - 46.65 mm (1.833 - 1.837 in) 
2. Exhaust: 46.75 - 46.85 mm (1.841 - 1.844 in) 

Limit: 

1. Intake: 46.45 mm (1.829 in) 
2. Exhaust: 46.65 mm (1.837 in) 

1. Cam base circle diameter A: 37.0 mm (1.457 in) 

Fig 5: Identifying Cam Base Circle Diameter

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1. Standard: 0.068 - 0.116 mm (0.0027 - 0.0046 in) 
2. Limit: 0.14 mm (0.0055 in) 

Fig 6: Measuring Thrust Clearance Of Camshaft With Dial Gauge

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