Industrial 1.6L Engine Cooling 2-5
.
Loss of Coolant
Thermostat Diagnosis
Use the following procedure to check for engine overheating, boiling or poor engine cooling:
Hang the thermostat on a hook in order to perform an operational check of the thermostat. Hang the thermostat in a
33 percent glycol solution at 12°C (10°F) below the temperature indicated on the valve.
The valve will close when you submerge the valve and agitate the coolant.
Use the following procedure to check for engine overheating, boiling or poor engine cooling:
1. Relieve the pressure and carefully remove the radiator cap.
2. Rub a 96.6°C (206°F) temperature stick on the thermostat housing.
3. Warm up the engine at a fast idle. Watch for coolant flow before the mark begins to melt.
• If the coolant does not flow, install a new thermostat. Recheck the system in order to ensure the system is
operating properly.
• If there is coolant flow, the problem is caused by something other than a faulty thermostat.
Step Action Value(s) Yes No
1
Do a visual system check to look for a coolant loss. Check
the ground under the equipment.
Is there coolant on the ground?
—
Go to Step 2
—
2
Check the radiator for stains and wetness.
Is the radiator wet or stained?
—
Go to Step 3 Go to Step 4
3
Repair or replace the radiator as necessary. Use any of the
following procedures. Refer to Radiator Replacement.
Is there still a loss of coolant?
—
Go to Step 4 System OK
4
Check the hoses for stains or wetness.
Are the hoses stained or wet?
—
Go to Step 5 Go to Step 6
5
Repair or replace the hoses as necessary. Refer to
Radiator Hose Replacement.
Is there still a loss of coolant?
—
Go to Step 6 System OK
6
Check the water pump for stains or wetness.
Is the water pump stained or wet?
—
Go to Step 7 Go to Step 8
7
Repair or replace the water pump. Use any of the following
procedures: Refer to Water Pump Replacement.
Is there still a loss of coolant?
—
Go to Step 8 System OK
8
Check the coolant recovery reservoir, if equipped.
Does the coolant overflow after you stop the engine?
—
Go to Step 9
—
9
Check the radiator cap for pressure retention.
Is the radiator cap retaining the proper pressure?
48 kPa
(7 psi) Go to Step 10 Go to Step 11
10
Check the temperature reading.
Is the temperature too high?
—Go to Engine
Overheating. Go to Step 12
11
Replace the radiator cap. Refer to Pressure Cap
Description.
Is there still a loss of coolant?
—
Go to Step 12 System OK
12
Check the coolant gravity for glycol concentration. Refer to
Coolant Concentration Testing.
Is the glycol concentration too low?
—
Go to Step 13 System OK
13
Replace the glycol. The recommended ethylene glycol mix
52/48 is normal up to a maximum of 60% glycol, 40%
water.
Is there still a loss of coolant?
——
System OK
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