Valve Stem-to-Guide Clearance Inspection: Inspection

How to use this service information .

1. Valve Stem-to-Guide Clearance - Inspect

   Preconditions 

   • Valve Removed
   • Valve Normal Condition - Refer to: Valve Inspection  or Valve Clearance Adjustment 

   Courtesy of HONDA, U.S.A., INC.

   Procedure/Specifications 

   • Subtract the O.D. of the valve stem, measured with a micrometer, from the I.D. of the valve guide measured with an inside micrometer or a ball gauge. Take the measurements in three places along the valve stem and three places inside the valve guide.

   Tool Details 

   Name
   a	Micrometer

   Specifications: The difference between the largest guide measurement and the smallest stem measurement should not exceed the service limit.

   Specifications 

   	Standard Value (New)	Service Limit
   Intake	0.025-0.055 mm (0.00098-0.00217 in)	0.080 mm (0.00315 in)
   Exhaust	0.055-0.085 mm (0.00217-0.00335 in)	0.080 mm (0.00315 in)

   Result 

   • If the measurement is not within specifications, replace the valve guide .