Chery SQR 7160 sedan. Manual — part 19

Usage, repair and maintenance specification of CAC gasoline engine

—the size of crankshaft thrust, thrust washer and cylinder

block thrust： unit：mm

Fig. 68

T

w

o thrus

t pieces

level

The size of
cylinder body
thrust

The size of
crankshaft thrust

The thickness of
thrust washer

standard

24±0.03 28.825—28.875 2.326±0.025

oversize
0.38

24±0.03 29.205—29.255 2.516±0.025

Installation：
——Before installation, use the second screw tap taps the

threaded hole in cylinder body, especially the threaded

hole of cylinder head bolt and main bearing bolt.

The threads of cylinder head bolt is M10×1.5—6H，

the threaded hole of main bearing bolt is M12×1.75—

6H。
——The installation of crankshaft woodruff key

Drive the semicircular key into key groove lightly.

The magnitude of interference for key and key groove is

0.00—0.051mm。After the semicircular key is installed,

check the protrusion height. It should be 1.392 —

1.739mm.
——Crankshaft thrust washers are two pieces. They are

only installed on the front and back thrust surface of

cylinder block.

Before installation, apply the engine oil on the

surface with oil groove of thrust washer. position the

surface with oil groove towards the cylinder body and the

surface with oil groove towards crankshaft.
——During installing crankshaft, engine oil should be

applied main journal, connecting rod journal, thrust

surface and bearing half.
——The character like 1,2,3,4,5 are casted on the top of

main bearing cap and also an arrow. During assembling,

install them from the front according to the sequence. At

the same time, have the arrow pointing to the front end

surface of cylinder block. The width of main bearing cap

1,2,4,5 is same, but the width of main bearing cap 3 is

larger than others.

The main bearing cap is retained by rabbet. It is

press fit between rabbet and cylinder body. The press fit

clearance is 0.025 — 0.145mm. After installation, the

surface of the first and the fifth main bearing caps should

be even or lower than the front and back end surface of

cylinder body.

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Usage, repair and maintenance specification of CAC gasoline engine

——Nine main bearing bolts are hex head flange side bolts, and

one is stud. For horizontal engine, the stud is mounted in the left

threaded hole of the second main bearing cap (see from the front)

which is for installing the carrier of oil collector. For the vertical

engine, it should be mounted on the left threaded hole of the

forth main bearing cap (see from the front).

Fig. 69

Before installing the main bearing bolt, engine oil should

be applied on the joint surface of head end.

The main bearing bolt and stud should be screwed by hand

first and tightened to 90—100Nm.
——The max rotating torque of the crankshaft (with piston rod

assembly) is 16Nm.

【12】. The removal and installation of oil baffle assembly

Fig. 70

Removal：
——Take out the oil baffle assembly from the right of the back

end of the cylinder body.

Installation：
——Install the oil baffle assembly from the right of the back

end of the cylinder body (viewed from the front). The oil baffle

assembly should be tensioned. The spring should be lower than

the flange surface of cylinder block oil pan.

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Usage, repair and maintenance specification of CAC gasoline engine

【13】. Engine oiling system:

1). The description of the oiling system:

Fig. 72

1.

rotary oil pump assembly 6. oil pump pressure relief valve

2.

oil collector 7. fuel filter

3.

oil pan 8. oil pressure sensor

4.

assistant oil passage of cylinder 9. camshaft

5.

main oil passage of cylinder 10. Hydraulic valve lifter

fig. 71

Through oil collector (2), the rotary oil pump(1)

which is installed in the front end of crankshaft

draws oil from oil pan (3) and pressurizes. The

pressure oil comes into the full flow type oil filter

through the assistant oil passage (4) on the left of

cylinder body (viewed from the front). The pressure

relief valve (6) is installed inside the oil pump case to

control main oil passage pressure . The pressure

relief valve will be opened under the pressure within

440kPa±20kPa. The filtered oil comes out from

the center hole of oil filter and comes into the main

oil passage of engine (5) through the center hole of

filter connector.

From the main oil passage, oil lubricates the

main bearing through the bore in the cylinder body

and lubricates the connecting rod bearing through oil

passage in the crankshaft.

There is a small oil port in the connecting rod

bearing bore near the exhaust side in the connecting

rod body. The oil sprays out from this small oil port

to lubricate the piston pin and cylinder bore.

Oil pressure sensor (8) is located near the oil

filter. It is connected with the main oil passage by a

inner oil passage. Oil is provided to the third journal

of camshaft through this oil passage.

Other journals of camshaft are lubricated by the

oil provided by the middle oil passage of camshaft.

Two sides of the middle oil passage are sealed by

steel ball.

Hydraulic lifter oil comes from oil gallery on

cylinder head, which is supplied from oil channel on

camshaft neck

The oil provided by the oil port inside the

hydraulic valve lifting rod lubricates the contact face

of valve rocker and hydraulic valve lifting rod.

The oil to lubricate the rocker carrier is provided

by the oil passage of cylinder head.

The contact face of the tip end of valve and

rocker is lubricated by splashing.

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Usage, repair and maintenance specification of CAC gasoline engine

2) The removal and installation of oil pan：

removal：
——Loosen drain plug and drain oil
——Loosen eighteen M6×20 bolts
——Take out the sealing gasket of oil pan
——Check if the left and right reinforced plates are still

clipped on the back face of oil pan flange face

Fig. 73

Installation：

A. crankshaft to oil pump shell

B. crankshaft to rear oil seal carrier

fig. 74

— — Apply locite 598 sealant and G Y409 anaerobic

sealant on the joint place between flange surface of oil pan

of cylinder body and oil pump case, and carrier of real oil

seal.
——Put the new rubber seal gasket on the cylinder body

and have the two sides of sealing gasket enter into the

grooves of carrier of real oil seal and oil pump.

——Install the oil pan with the two sides of sealing gasket

in the grooves of oil pan.

——Screw the bolt by hand (the bolt with washer indicated

in the left upper figure is precedent.)

— — Tighten bolts to 5.0 — 8.0Nm according to the

sequence of the left figure.

forward

Fig.75

——Replace the sealing gasket of drain plug. Screw in the

drain plug by hand and tighten to 21—25Nm.

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