Chery A15. Manual — part 238

Section Seven Piston and Connecting Rod Assembly

One. Checking the connecting rod and
bearing
(1) Meausre the connecting rod bearing
clearance with a clearance gauge (Figure
79).







(2) Lubricate the new bolts with engine
oil before screwing them on.
(3) Screw on the bolts.
(4) Screw on the bolts with a torque of
26N.m +1/4 turn. Do not use pneumatic
tools.
(5) Check the connecting rod side
clearance with a gauge (Figure 80) (see
Engine-Specifications).

Two. Check the cylinder cover and
piston
1. Measuring
Clean and blow dry the piston and
cylinder. Measure the piston diameter in
90 degree position, or about 14mm (see
Figure 82 for measurement position).







1-Piston diameter
2-14mm (9/16 in.)

Figure 79 Measure the Connecting Rod

Bearing Clearance

Figure 80 Measure the Connecting Rod

Side Clearance

Figure 81 Check the Cylinder

Figure 82 Measurement Position of

Piston

2. Unfixing
(1) Please mark the crank shaft bearing
cover in ink before the piston is unfixed
(Figure 67).

(2) The piston and connecting rod must
be unfixed and turn the crank shaft to put
the connecting rod in the center.
(3) Unscrew the connecting rod bolts.
(4) Install connecting rod conduit special
tools, protect the crank shaft surface
(Figure 83) and carefully press the piston
connecting rod assembly to the cylinder.
(5) Uninstall the special tool, connecting
rod conduit and screw on the bearing
cover bolts.


1-Special tool connecting rod conduit



3. Fixing
(1) Fix the piston ring onto the piston
(see Engine/Engine Body/Piston ring –
Fixing).
(2) Turn the crank shaft and connecting
rod and lubricate the connecting rod.
(3) Fix the bearing cover onto the
connecting rod.
(4) Fix the special tool of connecting rod
guide onto the cylinder body (Figure 84).
(5) After fixing the piston and
connecting rod, make sure that the
compression clearance is correct.
(6) Pour clean engine oil into the piston
and ring.
(7) Use the special tool to compress the
piston ring.

Figure 83 Mark of the Connecting Rod

Big End and Cylinder

Figure 84 Connectring Rod Conduit

(8) Fix the piston onto the cylinder and
mark accordingly (Figure 85).
(9) Fix the piston into the cylinder
together with the connecting rod.
(10) Unfix the conecting rod special tool.
(11) Fix the connecting rod lower
bearing cover with a torque of 26N.m
+1/4 turn.
1-Mark
2-Compression ring
3-Connecting rod conduit special tool
4. Checking the piston ring clearance
(Figure 86)



1. Clearance gauge






1. Clearance gauge










(1) Check the piston side clearance
(Figure 87) (see Engine-Specifications).
5. Unfixing
(1) Use an expander to unfix the upper
and middle piston rings (Figure 88).

Figure 85 Fixing the Piston/Connecting

Rod

Figure 86 Piston Ring

Figure 87 Piston Ring Side Clearance

Figure 88 Fixing/Unfixing the Piston

Ring

(2) Unfix upper/lower engine oil ring
side beam.

(3) Clear away the accumulated carbon
on the piston (Figure 89).

1-Piston ring

2-Piston ring

3-Side beam

4-Engine oil ring

5-Engine oil expander

Note: fix the piston ring

Figure 89 Fixing the Piston Ring

1-Side beam

Figure 90 Piston Ring

(4) Fix the the second and the first piston
rings (Figure 90).

(5) Fix the piston ring (Figure91).

1-Lower side beam

2-First piston ring

3-Upper side beam

4-Second piston ring

Figure 91