Refinish

Machining Valve Seats:





NOTE: Numbers in parentheses ( ) indicate a component or tool in the associated illustration.

1. Remove valves. Service and Repair
2. Inspect valve guide. Specifications
- If necessary after inspecting, replace valve guide
3. Machine valve seats
- Pay attention to operating instructions of tool manufacturer.
- Maintain dimensions in accordance with Valve Seat Specifications, below
4. Inspect valve seat for leaks
- Measure width of valve seat
- It necessary, correct width of valve seat and angles
5. Measure distance from end of valve stem to base of camshaft bearing
- Insert 6 mm round bar into the middle of the base of the camshaft bearing for this step and measure dimension with caliper gauge.
Standard size camshaft dimensions:
Inlet: 25.18 - 25.70 mm
Exhaust: 23.18 - 23 23.70 mm
Repair size camshaft dimensions:
Inlet: 23.93 - 24.45 mm
Exhaust: 22.93 - 23 23.45 mm

NOTE:
^ If the measurement obtained is less than the minimum dimension, no further correct valve clearance compensation exists
^ Replace valve seat rings

6. Install in the reverse order

Valve Seat Specifications
Valve Seat Width (b): 0.90 - 1.10 mm
Valve Seat Angle (a): 45°
Top Correction Angle (B): 35°
Bottom Correction Angle (y): 58°
Maximum Radial Runout: 0.03 mm