wsm L503 Workshop Manual page 134

L3130 · L3430 · L3830 · L4630 · L5030, WSM
Valve Lapping
1. Apply compound evenly to the valve lapping surface.
2. Insert the valve into the valve guide. Lap the valve onto its seat
with a valve flapper or screwdriver.
3. After lapping the valve, wash the compound away and apply oil,
then repeat valve lapping with oil.
4. Apply prussian blue to the contact surface to check the seated
rate. If it is less than 70 %, repeat valve lapping again.
IMPORTANT
• When valve lapping is performed, be sure to check the valve
recessing and adjust the valve clearance after assembling
the valve.
Free Length and Tilt of Valve Spring
1. Measure the free length (A) of valve spring with vernier calipers.
If the measurement is less than the allowable limit, replace it.
2. Put the valve spring on a surface plate, place a square on the
side of the valve spring.
3. Check to see if the entire side is in contact with the square.
Rotate the valve spring and measure the maximum tilt (B).
Check the entire surface of the valve spring for scratches.
If there is any defect, replace it.
Factory spec.
Free length (A)
Allowable limit
Tilt (B) Allowable limit
(A) Length
Valve Spring Setting Load
1. Place the valve spring on a tester and compress it to the same
length it is actually compressed in the engine.
2. Read the compression load on the gauge.
3. If the measurement is less than the allowable limit, replace it.
Factory spec.
Setting load /
Setting length
Allowable limit
1-S47
ENGINE
W1028814
41.7 to 42.2 mm
1.6417 to 1.6614 in.
41.2 mm
1.6220 in.
1.0 mm
0.039 in.
(B) Tilt
W1028935
117.6 N / 35 mm
12.0 kgf / 35 mm
26.4 lbs / 1.3780 in.
100.0 N / 35 mm
10.2 kgf / 35 mm
22.5 lbs / 1.3780 in.
W1078436
KiSC issued 02, 2007 A