Doosan G20P-5, Service Manual, Page: 68 / 306

G424F(FE) Service Manual Chapter 3. Engine Mechanical System 66
Make proper antifreeze additions.
Adding pure antifreeze as a makeup solution for
cooling system top-up is an unacceptable practice. It
increases the concentration of antifreeze in the
cooling system which increases the concentration of
dissolved solids and undissolved chemical inhibitors
in the cooling system. Add antifreeze mixed with
water to the same freeze protection as your cooling
system.
Thermostat Housing
Components
1) Seal 2) Housing 3) Sensor 4) Bolt 5) Seal
6) Thermostat 7) Bolt 8) Inlet-Water 9) Stud
Removal
Remove or disconnect
1.
Battery negative cable.
2.
Drain the coolant, loosening the radiator lower
hose.
3.
Electric connection from the temperature sensor.
4.
Radiator-to-thermostat upper hose, with a 6-mm
socket wrench and handle.
5.
Timing belt rear cover; see “Timing Belt Rear
Cover – Removal”, in this section.
6.
With special clamp pliers, loosen the upper hose
from the cab heating pipe, below the intake
manifold.
7.
Thermostat housing-to-cylinder head attaching
bolts, with a 13-mm socket and handle.
8.
Pull out the thermostat housing and remove the
lower hose to the thermostat housing, with a 10-
mm socket wrench and handle.
9.
Thermostat housing.
Installation
Install or connect
1.
A new “O” ring in the thermostat housing to the
cylinder head.
2.
Lower hose to the thermostat housing and clamps.
3.
Use a 10-mm socket wrench and torque wrench
to tighten the clamp.
Tighten
•
Clamp: 4 – 5 N
·
m (3 – 3,6 lb
·
ft).
4.
Thermostat housing and attaching bolts; without
tightening.
Obs.:
When installing the thermostat housing, the
heater pipe upper hose should be placed below the
manifold.
5.
With a 13-mm socket wrench and torque wrench;
tighten the attaching bolts.
Tighten
• 10 – 20 N · m (7 – 15 lb · ft.).
6.
Using special clamp pliers, install the upper hose
clamp below the intake manifold.
7.
Timing belt rear cover; see “Timing Belt -
Installation”, in this section.
8.
Radiator-to-thermostat upper hose and clamp.
9.
With a 6-mm socket wrench and torque wrench;
tighten the clamp.
Tighten
•
Bolts: 4 – 5 N
·
m (3 – 3,6 lb
·
ft.).
10.
Temperature sensor electric connection.
11.
Refill the cooling system.
12.
Battery negative cable.