Komatsu SAA6D140E-3 - Page 109

140-3 SERIES
11-45
STRUCTURE AND FUNCTION, MAINTENANCE STANDARD VALVE, VALVE GUIDE
Unit: mm
No. Check item Criteria Remedy
1
Amount of valve
sinking
Valve Standard size Tolerance Repair limit
Replace
valve or
valve seat
Intake valve 0 ±0.10 0.70
Exhaust valve 0 ±0.10 0.70
2
Thickness of
valve lip
Valve Standard size Repair limit
Replace
valve
Intake valve 2.4 1.9
Exhaust valve 2.15 1.75
3 Valve seat angle
Valve Standard size Tolerance
Repair or
replace valve
and valve seat
Intake valve 30º ±15'
Exhaust valve 45º ±15'
4
Outside diameter
of valve stem
Intake valve 10
–0.045
–0.060
Replace
valve
Exhaust valve 10
–0.074
–0.089
Inside diameter
of valve guide
Before inserting 9.5
+0.019
+0.001
Replace
valve guide
After inserting 10 ±0.011
Clearance between
valve guide
and valve stem
Valve Standard size Repair limit
Replace
valve or
valve guide
Intake valve 0.034 – 0.071 0.22
Exhaust valve 0.063 – 0.100 0.24
Bend of valve stem Repair limit: 0.02 (Total indicated runout, for 100)
Replace
valve
5
Protrusion of
valve guide
Standard size Tolerance
Repair
22.0 ±0.2
6
Free lengh of valve
spring
Spring Standard size Repair limit
Replace
valve spring
Large 81.7 —
Small 72.0 —
Installed load of
valve spring
Spring
Installed
length
Standard installed
load (N {kg})
Installed load limit
(N {kg})
Large 51.0
424.3±21.6
{43.3±2.2}
377.3
{38.5}
Small 46.0
215.6±10.8
{22.0±1.1}
192.1
{19.6}
Squarence of valve
spring
Repair limit: 2º (for both end)