CAMSHAFT INSPECTION
CAMSHAFT INSPECTION
SM1665866
id011000501500
1. Set the No.1 and No.5 journals of the camshaft on V-blocks.
2. Measure the camshaft runout using the dial gauge.
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• If it exceeds the maximum specification, replace the camshaft.
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Maximum camshaft runout
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0.030 mm {0.0012 in}
3. Measure the cam height using the micrometer as shown in the figure.
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• If it is less than the minimum specification, replace the camshaft.
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Standard cam height (Except MX-5 (ND) VIN serial No.300001-)
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IN: 41.57 mm {1.637 in}EX: 40.37 mm {1.589 in}
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Standard cam height (MX-5 (ND) VIN serial No.300001-)
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IN: 41.57 mm {1.637 in}EX: 40.61 mm {1.599 in}
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Minimum cam height (Except MX-5 (ND) VIN serial No.300001-)
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IN: 41.50 mm {1.634 in}EX: 40.30 mm {1.587 in}
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Minimum cam height (MX-5 (ND) VIN serial No.300001-)
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IN: 41.50 mm {1.634 in}EX: 40.54 mm {1.596 in}
4. Measure the journal diameter using the micrometer. Measurement positions total four and are in the X and Y directions, at two points (A and B) as shown in the figure.
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• If it is less than the minimum specification, replace the camshaft.
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Standard camshaft journal diameter
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24.96—24.98 mm {0.9827—0.9834 in}
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Minimum camshaft journal diameter
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24.93 mm {0.9815 in}
5. Measure the camshaft journal oil clearance using the following procedure:
- (1)Clean the camshaft journal and the journal receptacle part.
- (2)Put the camshaft on the cylinder head with the rocker arm detached.
- (3)Cut the plastigauge to the same length as the journal width and position it parallel to the camshaft.
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- (4)Install the camshaft caps. (See CYLINDER HEAD ASSEMBLY (II).)
- (5)Remove the camshaft caps. (See CYLINDER HEAD DISASSEMBLY (I).)
- (6)Measure the camshaft journal oil clearance.
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• If it exceeds the maximum specification, replace the cylinder head.
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Standard camshaft journal oil clearance
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0.035—0.080 mm {0.0014—0.0031 in}
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Maximum camshaft journal oil clearance
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0.090 mm {0.0035 in}
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6. Measure the camshaft end play using a dial gauge.
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• If it exceeds the maximum specification, replace the cylinder head or camshaft.
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Standard camshaft end play
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0.07—0.22 mm {0.003—0.008 in}
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Maximum camshaft end play
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0.98 mm {0.039 in}