Page 67 - E BOOK ENGINE MECHANICAL M2

4. SERVICE POINTS OF 4D56 ENGINE COMPONENT

(1) Using a resin spatula, scrape off the carbon deposit
on the fuel injector nozzle side face ("A" shown in the
figure).
(2) Spray the carburetor cleaner (MZ100139) or equiva-
lent to the nozzle side face ("A" shown in the figure).
Cau- Do not clean the injection part of the nozzle with
tion a resin spatula.
(3) Leave the injection part for a while until the carbon
deposit melts down, and then blow air to the injection
part.
Fig. 4-16 (4) Insert the special tool ornament remover
(MB990784) to the cylinder head (fuel injector insertion
hole) with turning the special tool as shown, and scrape
off the carbon deposit.

Cau- Do not touch the injection part of the nozzle with
tion hand or wipe it with a rag.
(5) Remove the special tool MB990784, and blow off
with air the carbon deposit on the cylinder head (fuel
injector insertion hole).
(6) Check that there is no carbon deposit remaining on
the contact surface of the fuel injector nozzle gasket.

In order to prevent carbon from adhering to the
Cau-
tion inner surface of the cylinder, blow air with the
piston in the TDC position.
Fig. 4-17
Repeat step 4 to step 6 several times until the
Note
carbon deposit is completely removed.

2. Install the nozzle gasket, fuel injector, pivot boss, and
injector supporter to the cylinder head as shown in the
figure.
3. Apply a small amount of engine oil to the seat surface
and thread of injector holder bolt, and then temporarily
tighten the bolt to the cylinder head.
4. Set the fuel leak-off gasket to the fuel leakage pipe,
and temporarily tighten to the fuel injector and to the cyl-
inder head using the eye bolt.
5. Tighten the eye bolt of the fuel injector side to the
specified torque.
Fig. 4-18 Tightening torque: 15 ± 2 Nm
6. Tighten the eye bolt of the cylinder head side to the
specified torque.
Tightening torque: 15 ± 2 Nm
7. Tighten the injector holder bolt to the specified torque.
Tightening torque: 10 ± 1 Nm

When the tightening angle is smaller than the
specified tightening angle, the appropriate tight-
ening capacity cannot be secured.
Cau- When the tightening angle is larger than the
tion
specified tightening angle, remove the bolt to
start from the beginning again according to the
procedure.

Pub. No. PTAE1228 4 - 6