Chery QQ, Service Manual

Page: 53 / 635

Chery QQ Service Manual
Mechanical Part of SQR 472Engine
52
Remarks: In the above tables, the capital letter and suffix following the sizes (For example, H
7
of
φ
28H
7
) mean the
process precision, which are unconcerned with the maintenance and may be ignored in the course of maintenance.
Chapter 4. Table of Measurement Parameters of SQR472
EngineSQR472
No. Measuring Items Acceptance value Remark
1 Axial clearance of crankshaft 0.089-0.211mm
Assemble the crankshaft and tighten the
main bearing cap bolt
≤
1 Nm
Mount the piston connecting rod
assembly and tighten the connecting
rod bolt
≤
5.5Nm
≤
6Nm
Torque of crankshaft
when rotating at
uniform speed
Installing timing belt and spark plug
≤
26 Nm
2
Mount the valve, spring and camshaft (excluding timing belt
and spark plug) on the cyllinder head, tighten the camshaft
bolt, and then measure the torque of the camshaft rotating at
uniform speed
≤
32 Nm
3
Distance between the outer edge of steel ball and the front end
of camshaft 5.65
±
0.5mm
4
Distance between the outer edge of steel ball and the rear end
of camshaft 8.65
±
0.5mm
5 Axial clearance of intake camshaft 0.10~0.179
6 Axial clearance of exhaust camshaft 0.10~0.253
7
Jumping amount of installation surface of flywheel wearing
piece 0.10mm
max
8 Protrusion height of crankshaft woodruff key 2
～
2.20mm
9 Intake valve clearance 0.18
±
0.05mm
10 Exhaust valve clearance 0.25
±
0.05mm
11
Tension of timing belt (When the middle part of the rigth side
is pressed down for 4-5mm
）
200
～
280N.m
12 Compression pressure of cylinder 10~14bar
13
Tension of generator belt
（
When the part between the
generator and water pump is pressed down for 4-5mm
）
98N.m
14 Refilling amount of engine oil (including filter) 3.5 Liter