Service Manual

Thermostat Removal and Installation
1. Lower the coolant level to below the thermostat. 7. Fill the cooling system to the proper level with a 50/50
solution of clean, soft water and ethylene glycol anti-
2. Loosen the hose clamp and disconnect the hose from freeze (See Checking the Cooling System and Chang-
the water outlet fitting. ing Coolant in the Maintenance section of this book.).
3. Remove the water outlet fitting and gasket (Fig. 38).
4. Replace the thermostat if necessary (See Thermostat
T
est in the Testing section of this chapter).
5. Do not allow the thermostat flange to protrude from
the water outlet fitting joint. Do not place thermostat stay
in the direction of thermoswitch hole. Use a new gasket
when installing the water outlet fitting.
6. Check for damaged hoses or damaged hose clamps.
Rep
lace as required. Install the hose on the water outlet
fitting and tighten the hose clamp.
Figure 38
Water Pump Service
1. Drain the cooling system.
2. Remove the drive belt from the water pump and
al
ternator.
3. Loosen the hose clamp and disconnect the hose from
t
he water pump.
4. Remove the water pump (Fig. 39).
5. Check the water pump for cracks or leaks. Rotate the
wat
er pump shaft by hand. If the bearings do not rotate
smoothly, or are noisy replace the water pump with a
new water pump. There are no replaceable parts in the
water pump.
Figure 39
6. Install the water pump and a new gasket onto the
1. Water pump
cylinder block.
2. Gasket
7. Check for damaged hoses or damaged hose clamps.
Replace as required. Install the hoses on the water
pump and tighten the hose clamps.
8. Install the alternator / water pump drive belt and adjust
be
lt tension (see Belt Tension Adjustment).
9. Fill the cooling system with a 50/50 solution of clean,
soft water and ethylene glycol antifreeze.
Liquid Cooled
Diesel Engine
Workman 3300-D/4300-D
Page 4 - 33 Liquid Cooled Diesel Engine