Honda HR-V: Valve Seat Reconditioning

Reconditioning

1. Valve, Valve Seal, and Valve Spring Seat - Remove

2. Valve Seat - Reconditioning

1. Inspect valve stem-to-guide clearance. If the valve guides are worn, replace them before cutting the valve seats.
2. Renew the valve seats in the cylinder head using a valve seat cutter.
3. Carefully cut a 45º seat, removing only enough material to ensure a smooth and concentric seat.

4. Bevel the upper and lower edges at the angles shown in the illustration.

   Check the width of the valve seat and adjust accordingly

5. Make one more very light passes with the 45º cutter to remove any possible burrs caused by the other cutters.

Intake

Standard (New): 0.85-1.15 mm (0.0335-0.0453 in)
Service Limit: 1.6 mm (0.063 in)

Exhaust

Standard (New): 1.25-1.55 mm (0.0492-0.0610 in)
Service Limit: 2.0 mm (0.079 in)

6. After resurfacing the valve seat, inspect for even valve seating; Apply Prussian Blue compound (A) to the valve face. Insert the valve in its original location in the cylinder head, then lift it and snap it closed against the valve seat several times
7. The actual valve seating surface (B), as shown by the blue compound, should be centered on the valve seat:
   • If it is too high (closer to the valve stem), you must make a second cut with the 60º cutter to move it down, then one more cut with the 45º cutter to restore valve seat width.
   • If it is too low (close to the valve edge), you must make a second cut with the 30º cutter to move it up, then make one more cut with the 45º cutter to restore valve seat width.

   NOTE: The final cut should always be made with the 45º cutter.

8. Insert the intake and exhaust valves in the cylinder head, and measure the valve stem installed height (A).

Standard (New): 50.10-50.60 mm (1.9724-1.9921 in)
Service Limit: 50.90 mm (2.0039 in)

9. If the valve stem installed height is over the service limit, replace the valve and recheck. If it is still over the service limit, replace the cylinder head; the valve seat in the cylinder head is too deep.

3. All Removed Parts - Install

1. Install the parts in the reverse order of removal.

VALVE STEM-TO-GUIDE CLEARANCE INSPECTION

Inspection

1. Valve and Valve Seal - Remove

2. Valve - Inspect

3. Valve Stem To Guide Clearance - Inspect

1. 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 ball gauge. Take the measurements in three places along the valve stem and three places inside the valve guide. The difference between the largest valve guide measurement and the smallest valve stem measurement should not exceed the service limit.

Standard (New): 0.02-0.05 mm (0.0008-0.0020 in)
Service Limit: 0.08 mm (0.0031 in)
Standard (New): 0.05-0.08 mm (0.0020-0.0031 in)
Service Limit: 0.11 mm (0.0043 in)

4. All Removed Parts - Install

1. Install the parts in the reverse order of removal.

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