ENGINE
M6060, M7060, WSM
1-S59
Correction of Valve and Valve Seat
• Before you correct the valve and seat, examine the valve
stem and measure the I.D. of the valve guide section.
Repair them if necessary.
• After you correct the valve seat, be sure to examine the
valve recessing.
1) Correction of valve
1. Correct the valve with a valve refacer.
2) Correction of valve seat
1. Slightly correct the seat surface with a 1.0 rad (60 °) or 0.79 rad
(45 °) valve seat cutter.
2. Correct the seat surface with a 0.52 rad (30 °) or 0.26 rad (15 °)
valve seat cutter.
3. After you correct the seat, examine that the valve seating is flat.
Apply a thin layer of compound between the valve face and
valve seat, and lap them with a valve lapping tool.
4. Examine the valve seating with Prussian Blue. The valve
seating surface must show good contact on all sides.
9Y1210828ENS0084US0
Free Length and Tilt of Valve Spring
1. Measure the free length (B) of valve spring with a vernier
calipers. If the measurement is less than the allowable limit,
replace it.
2. Put the valve spring on a surface plate, and put a square on the
side of the valve spring. Turn the valve spring to measure the
maximum tilt (A). If the measurement is more than the allowable
limit, replace it.
3. Examine the full surface of the valve spring for scratches. If
there is a problem, replace it.
9Y1210828ENS0085US0
Valve face angle Factory specification
0.79 rad
45 °
Valve seat width Factory specification
3.3 to 3.6 mm
0.13 to 0.14 in.
Valve seat angle Factory specification
0.79 rad
45 °
(1) Valve Seat Width
(2) Identical Dimensions
(A) Examine the Contact
(B) Correct Seat Width
(C) Examine the Contact
(a) 0.26 rad (15 °) or 0.52 rad (30 °)
(b) 0.79 rad (45 °) or 1.0 rad (60 °)
(c) 0.52 rad (30 °) or 0.26 rad (15 °)
Tilt (A) Allowable limit
1.0 mm
0.039 in.
Free length (B)
Factory specification
35.1 to 35.6 mm
1.39 to 1.40 in.
Allowable limit
34.6 mm
1.36 in.
(A)Tilt (B)Free Length
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