JAC HFC4DA1-2C - Page 12

Maintenance manual for sunray hfc4da1-2c china-IV diesel engines
13
Section VI Main Fitting Clearances and Allowable Wear Limits of Engine
No. Name Standard Size (mm)
Fitting
nature
Assembly
Clearance for
New Engine
(mm)
Wear Limit
(mm)
1
Contact width between
valve and seat ring
Intake valve 1.7 2.2
Exhaust valve 2 2.5
2
Valve sinkage
Intake valve 0.73 1.28
Exhaust valve 0.71 1.2
3 Backlash 0.05-0.13 0.3
4
Axial run-out clearance of
idler gear A
0.07 0.2
5
Outside diameter of tappet
010.0
028.0
13
−
−
Φ
Clearance
0.01～0.046
0.10
Tappet bore
018.0
0
13
+
Φ
6 Radial run-out of push rod 0.3
7 Deflection of rockshaft 0.3
8
Outside diameter of
rockshaft
0
02.0
19
−
Φ
Clearance
0.01～0.05
0.20
Rocker arm bore
03.0
01.0
19
+
+
Φ
9
Rod diameter of intake
valve
039.0
054.0
8
−
−
Φ
Clearance
0.039～0.071
0.20
Valve guide bore
017.0
0
8
+
Φ
10
Rod diameter of exhaust
valve
064.0
079.0
8
−
−
Φ
Clearance
0.064～0.096
0.25
Valve guide bore
017.0
0
8
+
Φ
11
Free height of valve spring 48
Perpendicularity of valve
spring
Φ1.4
12
Outside diameter of idler
gear A shaft
025.0
055.0
55
−
−
Φ
Clearance
0.025～0.080
0.2
Inside diameter of idler gear
A bearing
03.0
0
55
+
Φ
13 Cylinder sleeve bore
065.0
020.0
93
+
+
Φ