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Dacia SuperNova (engine E7J). Manual - part 12

ENGINE E7J-A-2/60

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ENGINE AND LOWER ENGINE UNITS

ISMO UNTING

The following are dismounting:

-the water conduit and the oil-level-

gauge guide; their watertight sealing is
done with rubber rings which must be re-
placed for every dismantlement;

-the clutch;
-the engine flywheel, blocked by

means of MOT 582;

-the lower crankcase;
-the pinion of the crankshaft;
-the stretching runner/pulley;
-the water-pump;

-the oil-pump

Perform connecting rods caps

identification in regards to connecting rod
body.

To be taken off:

-the caps of the connecting rod and

the bushes;

-the jacket-maintaining device;

the jacket-piston-rod set;

-the bearing caps and their bushing;
-the shaft and the axial play bushes;
-the bushes on the block.

The axes of the pistons are taken apart.
The piston is placed on its stand, after

positioning the piston bolt (axis) with the
release hole (two lines T for position-find-
ing the centre of the hole will make align-
ment easier).

The bolts are taken off in a pressing-

machine by means of the E extraction

AUTION

Do not use punchers for line-

up marking in order to avoid fis-
sures; use an indelible pen.

THE CYLINDER CRANKCASE

RECOVERY ENGINE

ENGINE E7J-A-2/60

10 - 25

ENGINE AND LOWER ENGINE UNITS

Re-Mounting

Clean the crankcase, especially the

jacket-sealing part.

Preparation of the piston-and-jacket set

The parts supplied in the collection are

matched.

Do the line-up marking of the set, from

A to D, in order to keep the parts matched.

Remove completely the anti-rust film;

never erase the parts.
These engines are equipped with rub-
ber rings for jacket watertight-sealing;
these rings ensure only watertight-seal-
ing condition. The jackets lean directly
against the cylinder crankcase; extra
height X is achieved by the manufac-
turer.

The checking-up of the jacket extra-

height is done in the following way:

-the jackets are place din the block

without their sealing-ring;

-extra-height X is checked by

means of the MOT.251 and MOT.252-01
devices.

THE CYLINDER CRANKCASE

RECOVERY ENGINE

ENGINE E7J-A-2/60

10 - 26

ENGINE AND LOWER ENGINE UNITS

-M

O UNTING

The jackets are positioned such a way as:

-the difference between two succes-

sive jackets should be max. 0.05 mm;

-the extra-height should be placed in

ascending order between cylinders 1 and 4.

-the extra-height X must be within

0.02 mm and 0.09 mm;

-in case there is an erroneous extra-

height, it is checked again by means of a
new set of jackets in order to see whether
the cause is the block or the jacket; if not,
check the theoretical values of both the
block and the jackets.

The A, B, C, D set is done over with

the correct extra-height obtained, then the
jackets, the bolts and the pistons are num-
bered from 1 to 4 (no. 1 towards the fly-
wheel), so that the concordance with the
corresponding connecting rods is found.

The axes of the pistons are mounted by

means of the MOT 574-22 device.

The axes of the pistons are fixed in the

rod, and loose in the pistons.

Check if the axes of the pistons slide

freely in the new corresponding pistons.

The axis of piston E is mounted on the

mounting axis A.

The C centring device is screwed up to

the end and then unscrewed a quarter of a
rotation.

THE CYLINDER CRANKCASE

In order to heat the connecting rods an

electric range of 1 500 W is used.

RECOVERY ENGINE

ENGINE E7J-A-2/60

10 - 27

ENGINE AND LOWER ENGINE UNITS

The arrow marked by the end of the

piston must be directed towards the
flywheel.

The connecting rods do not have a

mounting direction, but the spurs of the
semi-bushes will be positioned on the same
side.

For the assembly of the piston and the

connecting rod, the following directions
will be observed:
-jack B13 is set onto the stand and the pis-
ton (with the arrow pointing upwards) is
fixed on the jack;

-the centring device and the axis of

the piston are oiled with motor oil;

-the free sliding of the piston axis is

checked, as well as the positioning of the
piston.

When the base of the connecting rod

reaches the needed temperature (ca. 250

the speedy mounting of the piston axis
should be done in the following manner:

-the centring guide is introduced in

the piston;

-the rod is positioned in the piston;
-the piston axis is pressed up to the

end.

It should be checked if the piston axis

remains retracted as to the outer diameter
of the piston for any position of the con-
necting rod in the piston.

The “rod-piston-ring” sets are mounted

in the cylinder jackets by using the
mounting jack.

The watertight-sealing fittings are

mounted onto the cylinder jackets.

THE CYLINDER CRANKCASE

The rings are mounted:

-the oiling ring;
-the watertight-sealing ring (with the

“TOP” mark pointing upwards);

-the compression ring (with the “TOP”

mark pointing upwards).

The slits of the rings being adjusted, they

shall never be altered; they are oiled and the
rings are positioned; the slit of the oiling ring
will be placed opposite a full part of its channel.

RECOVERY ENGINE

Content .. 10 11 12 13 ..