Table Of Main Fit Clearance For Sqr472 Engine Sqr472; Clearance Between Cylinder Hole And Piston Skirt (Piston To Cylinder Clearance); Clearance Of Crankshaft Main Bearing; Clearance Of Crankshaft Connecting Rod Bearing - Chery QQ Service Manual

Chery QQ Service Manual
Chapter 3. Table of Main Fit Clearance for SQR472 Engine SQR472
1

Clearance between Cylinder Hole and Piston Skirt (Piston to Cylinder Clearance)

Name of Component
Cylinder hole
Piston skirt
2

Clearance of Crankshaft Main Bearing

Name of Component
Crankshaft main journal
Bearing bushing
Bore of cylinder main bearing
3

Clearance of Crankshaft Connecting Rod Bearing

Name of Component
Crankshaft connecting rod
journal
Bearing bushing
Bore of connecting rodbig
end bearing
4 Clearance between Piston Pin and Piston Pin Hole
Name of Component
Piston Pin Hole
Piston pin
5 Inteference between Piston and Small End of Connecting Rod
Name of Component
Connecting rod small end
hole
Size and Tolerance
+
. 0 01
φ72
0
-
. 0 015
φ72
-
. 0 025
Size and Tolerance
φ42h
。
6–0 016
0
2
- 0.006
+
. 0 041
φ46F
+
. 0 025
6
Size and Tolerance
0
φ37h -
. 0 016
6
0
-
. 0 006
1.5
+
. 0 041
φ40F
+
. 0 025
6
Size and Tolerance
+
. 0 007
φ18
+
. 0 002
-
. 0 001
φ18
-
. 0 004
Size and Tolerance
-
. 0 026
φ18
-
. 0 044
50
Mechanical Part of SQR 472Engine
Clearance or Value of
Interferenc
Divided into two groups:
Clearance for group X:
0.019mm～0.03mm
Clearance of group S:
0.018mm～0.029mm
Clearance or Value of
Interferenc
Clearance 0.025~0.069
Clearance or Value of
Interferenc
Clearance 0.025~0.069
Clearance or Value of
Interferenc
Divided into twogroups
Clearance for group A:
0.004 mm～0.0085mm；
Clearance for group B:
0.0045mm～0.009 mm
Clearance or Value of
Interferenc
Value of Interferenc
0.021~0.043
Remark
F
0.005
72
Group X:
0
F
0.01
72
Group S:
0.005
Remark
Remark
Remark
Notice: When installed
with hand, the piston pin
may pass through the
piston pin hole smoothly
without any obvious
obstruction, otherwise the
piston pin should be
replaced.
Remark