Chery Fora (Elara A520). Manual — part 161

CHERY A21 SERVICE MANUAL

MECHANISM OF 2.0NALC ENGINE

17

2.1.3

Installation steps

The installing steps are reverse to those for
removal.

2.2

Replace camshaft, bearing bushings,
valve and valve oil seal.

2.2.1

Needed tools and auxiliary materials

Special tools for valve oil seal, engine
transmission oil, a set of sleeve tools, an
adjustable spanner, special tools for timing
and a set of Allen wrenches

2.2.2

Removal

1)

Remove the dynamo belt (see “removal
of dynamo belt” for details).

2)

Remove

the

timing

belt

(see

“replacement of engine timing belt and
timing calibration” for details).

3)

Remove the cover of engine valve
chamber.

4)

Clamp the timing special tool into
camshaft slot and fasten the bolt.

Camshaft Tool

CHERY A21 SERVICE MANUAL

MECHANISM OF 2.0NALC ENGINE

18

5)

Dismantle the belt pulley of air intake
and exhaust camshafts with torque
wrench.

6)

Remove the back cover of timing belt.

7)

Dismantle the bearing caps of air intake
and exhaust camshaft respectively and
put them down in the sequence.

Note: The second, third, fourth and fifth
camshaft bearing caps are marked with I1, I2,
I3, I4 (E1, E2, E3, E4), which stands for the
corresponding bearing cap of 1, 2, 3, 4
cylinder respectively. (“I” refers to intake
camshaft, “E” refers to exhaust camshaft).

Torque:

CHERY A21 SERVICE MANUAL

MECHANISM OF 2.0NALC ENGINE

19

See the following picture for removal sequence of intake and exhaust camshaft-bearing caps:

8) Take out the camshaft and the hydraulic tappet.

9) Remove the valve spring with special tools.

(Picture is unavailable)

10) Remove the used valve oil seal with special tools.

(Picture is unavailable)

2.2.3

Inspection

1)

Check the valve spring.

Measure the free length, the verticality and
the length under special pressure with caliper.

Standard

Value(mm)

Free length

47.7

Length of

620N

32

Replace with the new valve spring if the
measured value exceeds the limit value.

CHERY A21 SERVICE MANUAL

MECHANISM OF 2.0NALC ENGINE

20

2) Check camshaft

Measure

the

camshaft

diameter

with

micrometer caliper.

Standard Value

（mm）

Limit Value

(mm)

Diameter

￠24

-0.053

-0.040

Replace with the new camshaft if the
measured value exceeds the limit value.

3) Examine camshaft

Measure the high of cam with micrometer
caliper.

Standard Value

（mm）

limit value

（mm）

Intake

Cam

37.15

Exhaust

Cam

37.05

Replace with the new camshaft if the
measured value exceeds the limit value.

4)

Examine diameter of valve stem

a:

Measure the diameter of valve stem with
micrometer caliper.

See the picture for measuring points: they are
26, 52, and 78 mm from measure positions to
bottom of valve.

Valve

Guide

External Diameter

Of Valve Stem

Internal Diameter

Of Valve Guide

Measuring Point