No. Name Dimension and tolerance Fit clearance
Thickness of connecting rod big end 22
0
-0.1
4
Width of crankshaft connecting rod journal
22
+0.30
+0.15
0.15~0.4
First piston ring groove height
1.2
+0.05
+0.03
5
Top compression ring height 1.2
-0.005
-0.03
0.035~0.08
Second piston ring groove height 1.5
+0.04
+0.02
6
Second compression ring height 1.5
-0.005
-0.030
0.025~0.07
piston oil ring groove height 2.5
+0.03
+0.01
Blade height of steel strip composite type oil ring 0.46±0.02
7
Bracing spring height of steel strip composite type oil
ring
1.5±0.03
0.02~0.18
8 Crankshaft key groove width
014.0
010.0
5
+
−
9 Diameter of crankshaft front oil seal Φ36
0
-0.1
10 Diameter of crankshaft rear oil seal Φ75
0
-0.1
Outside diameter of engine oil dipstick tube
0
1.0
7.16
−
φ
11
Diameter of cylinder block scale tube orifice
043.0
0
7.16
+
φ
Diameter of cylinder head valve guide orifice φ6+0.015
Outside diameter of valve guide φ11x6
12
Diameter of cylinder head valve guide bottom orifice φ11H7
-0.022～
-0.050
Outside diameter of intake valve stem φ5.98±0.008
13
Diameter of cylinder head intake valve guide orifice φ6+0.015
+0.012～
+0.043
Exhaust valve stem diameter φ5.96±0.008
14
Diameter of cylinder head exhaust valve guide orifice φ6+0.015
+0.032～
+0.063
Diameter of camshaft first journal
050.0
066.0
632
−
−
eφ
15
Diameter of cylinder head first bearing hole
+0.050～
+0.090
Diameter of camshaft second journal
040.0
053.0
624
−
−
eφ
16
Diameter of cylinder head second bearing hole
021.0
0
724
+
Hφ
+0.040～
+0.074
17
Diameter of camshaft third journal
040.0
053.0
624
−
−
eφ
+0.040～
