6. Thermostat
1) Drain cooling system.
2) Disconnect thermostat cap from intake
manifold.
Fig. 6-10
3) Remove thermostat.
1. Crankshaft pulley2. Crankshaft pulley bolt
3.Crank timing belt pulley bolt
Fig. 6- 12
5) Remove timing belt outside cover.
I
Fig. 6- 11Fig. 6- 13
7. Water Pump
1) Drain cooling system.
Refer to 1. Coolant draining on previous
page.
2) Remove the radiator shroud and cooling
fan & clutch at the same time.
Refer to item 4 on previous page.
3) Loosen water pump drive belt tension.
Then remove water pump pulley and pump
drive belt.
4) Remove crankshaft pulley by removing
4 pulley bolts. Crankshaft timing belt
pulley bolt at the center is needs not to be
loosened.
6-6
6) Loosen tensioner bolt and stud, and remove
belt from crank timing belt pulley and
camshaft pulley after pushing up tensioner
plate fully with finger as shown in Figure.
24 1
1.Timing belt
2.Tensioner plate3.Tensioner bolt4.Tensioner stud
Fig.6-14
8) Remove water pump assembly.
7) Remove timing belt tensioner, plate and
spring.
1. Water pump
Fig. 6- 15
6-3. INSPECTION OF COMPONENTS
Thermostat
1) Make sure that air bleed valve of thermostat
is clear. Should this valve be clogged, engine
would tend to overheat.
Fig. 6- 16
1. Air bleed valve
2) Check valve seat for some foreign matters
3) Check thermostatic movement of wax pellet
being stuck which prevent valve from
seating tight.
as follows:
Immerse thermostat in water, and heat
water gradually.
Check that valve starts to open at specifi-
cation temp.
If valve starts to open at a temperature
substantially below or above, thermostat
unit should be replaced with a new one.
Such a unit, if reused, will bring about
overcooling or overheating tendency.
1. Thermostat
2. Thermometer
Fig. 6- 173. Heater
6-7
6-4. IMPORTANT STEPS FOR
REINSTALLATION
Water Pump
1) Install new pump gasket to cylinder block.
2) Install water pump to cylinder block.
Tightening torque
for bolts & nuts
lo- 13 N-m
1 .O - 1.3 kg-m
7.5 - 9.0 lb-ft
After installing water pump, install rubber seal
between water pump and oil pump, and another
between water pump and cylinder head.
Fig, 6-201. Rubber seal
3) Install belt tensioner plate, tensioner,
tensioner spring, timing belt and timing belt
outside cover.
NOTE:
l Special care must be used when installing belt
tensioner and timing belt. Be sure to refer to
p. 3-48 of this manual.
l Torque each bolt and nut to specification.
4) Install crankshaft pulley, water pump
pulley, pump drive belt, cooling fan &
clutch and radiator shroud.
5) Adjust intake and exhaust valve lashes.
(For adjustment and related data, refer to
p. 3-53 of this manual).
6) Adjust water pump belt tension.
(Refer to P. 6-10).
7) Connect negative cable at battery.
8) Fill the cooling system.
Thermostat
1) When positioning the thermostat on the
intake manifold, be sure to bring its air brea-
ther valve (iJ to front side of the engine.
Fig. 6-21
2) Install new gasket and
intake manifold.
3) Fill the cooling system.
thermostat cap to
Cooling Fan, Fan clutch and Water Pump Belt
Once cooling fan, fan clutch or water pump belt
has been removed, make sure to tighten bolts
and nuts securely in reinstallation and adjust
pump belt tension to specification. (For specifi-
ed tension, refer to p. 6-10.)
6-9
