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Engine Mechanical (4HK1-TC) 6A-57 9. Check if the rocker arm shaft is worn. • Use a micrometer to measure 8 places rubbed by the rocker arms. • Replace the shaft if the diameter is less than the limit. 10. Inspect a clearance between the rocker arm and the rocker arm shaft. • Use a cylinder gauge to measure an inside diameter of the bush of the rocker arm to • If the measurement exceeds the limit, replace the rocker arm and the shaft. 11. Inspect a clearance between the roller of the rocker arm and the rocker arm pin. rocker arm and the roller, pull it strongly in the b. After marking the measuring point, pull the string out push the roller fully into the rocker c. The gap between the measurement taken under a. and that under b. Is the a clearance Bend of the rocker arm shaft mm (in) Limit 0.3 (0.012) External diameter of the rocker arm shaft mm (in) Standard 21.979 – 22.000 (0.865 – 0.866) Limit 21.85 (0.860) N6A6087E N6A6088E Clearance between the rocker arm and mm (in) Standard 0.010 – 0.056 (0.0004 – 0.0022) Limit 0.2 (0.0079 ) Clearance between the roller and the mm (in) Standard 0.068 – 0.100 (0.0026 – 0.0039) Limit 0.2 (0.0079) N6A6089E |