Geely Emgrand X7. Manual part — 122

6. Use a special tool to compress

the valve springs and install the
valve spring locking pieces.

7. Confirm locking pieces is in

place. slowly remove the special
tool with a wood hammer gently
knock the valve, so that the valve
is in place.

Warning: Do not apply excessive
force, otherwise the valve spring
might pop up and cause personal
injury.

8. Install the valve lifter.

9. Install the cylinder hood

assembly.

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487

2.6.8.16 Replacement of Piston, Connecting Rod and Connecting Rod Bearing

Dismantlement Procedure

1. Dismantle the engine. Refer to

2.6.8.13 Replacement of Engine.

2. Refer to 2.6.8.14 "Replacement

of Cylinder Hood Assembly" to
dismantle the cylinder hood.

3. Dismantle oil pan, refer to 2.9.8.3

Replacement of Oil Pan.

4. Dismantle

the

crankcase.

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5. Rotate the crankshaft, so that the

cylinder NO.1 and 4 are at BDC
positions. Dismantle the cylinder
NO.1 rod bearing cap bolts.

6. Hold the connecting rod bolts

and take out the Cylinder #1
connecting rode bearing cap and
mark the Cylinder #1 position on
the bearing cap.

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7. Drive #1 cylinder piston and

connecting rod assembly with a
wooden stick and mark the
position of #1 cylinder on the
piston and connecting rod
assembly.

8. Use the same method to

dismantle the piston connecting
rod assemblies of cylinders No.
2, 3 and 4 respectively.

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488

Carry out the following inspection procedures prior to the installation of the piston.

1. Inspect whether the rod is bent or distorted. If the rod is bent or distorted, replace the

connecting rod.

Cross degree: 0.03 (basic length range
of 100mm)

Distortion: 0.05 (Basic length range of
100 mm)

2. Inspect the connecting rod

bearings.

3. Inspect whether the bottom rod is

worn.

4. Inspect whether the connecting

rod upper end is scratched.

5. Inspect whether there is the

crankshaft connecting rod
bearing journal wear and tear.

6. Inspect whether the piston is

scratched, cracked and worn.

7. Use the caliper to measure the

piston pin-hole diameter.

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Standard piston pin-hole diameter:

Group mark

Piston pin-hole
diameter (mm)

A 22.007.

22.010

B 22.010.

22.013

8. Use the micrometer to measure

the piston pin diameter.

Standard piston pin diameter:

Group mark

Piston pin
diameter (mm)

A 22.004.

22.007

B 22.007.

22.010

9. Inspect the fit clearance between

piston pin-hole and piston pin.

Standard value :0 ～ 0 .
006mm(Metric)

Note: If the clearance does not meet

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489

the requirement, replace the piston
pin, and replace the piston if
necessary.

11. Inspect interference fit between

piston pin and connecting rod.

12. Inspect engine cylinder block

hole diameter.

Standard Value: φ

015

.

0

0

85

+

(Metric)

13. Measure the piston diameter with

the micrometer perpendicular to
the piston pin-hole with a
distance to the bottom of the
piston of 13 mm.

Standard Value: φ77.75±0.009

13

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14. Inspect the cylinder fit clearance, and subtract the measured piston’s diameter with the

measured cylinder hole’s diameter.

Standard clearance: 0.0275mm~0.0575mm

Note: If the clearance exceeds the range, replace the piston. If necessary, replace the cylinder
block.

(To replace the piston, the diameter group No. printed on the piston pin and the piston pin-hole
diameter group No. printed on the piston can be used to choose the correct piston; the piston
diameter group No. = piston pin-hole diameter group No. on the piston)

15. Select a new set of piston rings,
use a gap regulator to measure piston
ring end gap.

Oil Ring End Clearance: 0.20mm～
0.40mm (Metric)

Second Compression Ring End
Clearance: 0.30mm ～ 0.50mm
(Metric)

The first compression ring end gap:
0.20mm-0.40mm (Metric); 16. Check
the fit clearance of connecting rod
bearing bush.

(a) Place one plastic gap gauge on

the neck of the connecting rode
shaft.

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(b) Install the connecting rode cap (connecting rode cap’s frontward mark should face to the

front end of the engine), and tighten the connecting rode bolts as per the specified torque.

(c) Dismantle the connecting rod cap

(d) Use the plastic gap gauge to measure the maximum width along the clearance

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