Inspection - Valve Springs, Valve Guides

VALVE SPRINGS 1. Measure the free length of each valve spring. If the spring free length is less than the service limit, replace the valve spring.

2. Using a square, check the spring tilt (out-of-squareness) of each valve spring relative to the perpendicular to the seat surface. If the out-of-squareness is greater than the service limit, replace the valve spring.

Valve Spring [Standard] Free length: 48.86 mm Length under 183 N load: 39.00 mm Length under 400 N load: 30.50 mm Spring tilt (out-of-squareness): 1.5° or less [Limit] Free length: 47.86 mm Spring tilt (out-of-squareness): 3°

VALVE GUIDES

Measure the clearance between the valve guide and the valve stem (at several points along the length). If the clearance is greater than the service limit, replace the valve guide.

Valve Guide-to-Stem Clearance [Standard] Intake valve: 0.02 - 0.05 mm Exhaust valve: 0.035 - 0.065 mm [Limit] Intake valve: 0.10 mm Exhaust valve: 0.13 mm