Operation Manual

BX25, RCK54(P)-23BX, RCK60B-23BX, LA240, BT601, WSM
ENGINE
I
fi~
3TMABAB1 P057A
(1 ) (1 )
3EEACAA 1 P084A
+
3EEABAB1P115A
3EEABAB1 P116A
Valve Recessing
1. Clean the cylinder head surface, valve face and valve seat.
2. Insert the valve into the valve guide.
3. Measure the valve recessing with a depth gauge.
4. If the measurement exceeds the allowable limit, replace the
valve.
5. If it still exceeds the allowable limit after replacing the valve,
replace the cylinder head.
0.10 (protrusion) to
Valve recessing
Factory spec.
0.10 (recessing) mm
0.0039 (protrusion)
to
(Intake and exhaust)
0.0039 (recessing) in.
Allowable limit
0.30 (recessing) mm
0.0118 (recessing) in.
(1) Cylinder Head Surface
(A) Recessing
(8) Protrusion
Wi 0768800
Clearance between Valve Stem and Valve Guide
1. Remove carbon from the valve guide section.
2. Measure the valve stem O.D. with an outside micrometer.
3. Measure the valve guide I.D. with a small hole gauge, and
calculate the clearance.
4. If the clearance exceeds the allowable limit, replace the valves.
If it still exceeds the allowable limit, replace the valve guide.
Clearance between
valve stem and valve
Factory spec.
0.030 to 0.057 mm
0.00118 to 0.00224 in.
guide
Allowable limit
0.10mm
0.0039 in.
Valve stem
0.0. Factory spec.
5.968
to 5.980 mm
0.23496
to 0.23543 in.
Valve guide
1.0.
Factory spec.
6.010 to 6.025 mm
0.23661 to 0.23720 in.
W10311740
1-543