Perkins 1104E Systems Operation Testing And Adjusting page 48

48
Testing and Adjusting Section
Checking the Filler Cap
One cause for a pressure loss in the cooling system
can be a faulty seal on the radiator pressure cap.
Illustration 54
Typical schematic of filler cap
(1) Sealing surface between the pressure cap and the radiator
Personal injury can result from hot coolant, steam
and alkali.
At operating temperature, engine coolant is hot
and under pressure. The radiator and all lines
to heaters or the engine contain hot coolant or
steam. Any contact can cause severe burns.
Remove filler cap slowly to relieve pressure only
when engine is stopped and radiator cap is cool
enough to touch with your bare hand.
To check for the amount of pressure that opens the
filler cap, use the following procedure:
1. After the engine cools, carefully loosen the filler
cap. Slowly release the pressure from the cooling
system. Then, remove the filler cap.
2. Inspect the pressure cap carefully. Look for
damage to the seal. Look for damage to the
surface that seals. Remove any debris on the cap,
the seal, or the sealing surface.
Carefully inspect the filler cap. Look for any
damage to the seals and to the sealing surface.
Inspect the following components for any foreign
substances:
•
Filler cap
•
Seal
•
Surface for seal
Remove any deposits that are found on these
items, and remove any material that is found on
these items.
3. Install the pressure cap onto a suitable
pressurizing Pump.
4. Observe the exact pressure that opens the filler
cap.
5. Compare the pressure to the pressure rating that
is found on the top of the filler cap.
6. If the filler cap is damaged, replace the filler cap.
Testing The Radiator And Cooling
System For Leaks
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Use the following procedure to test the radiator and
the cooling system for leaks.
Personal injury can result from hot coolant, steam
and alkali.
At operating temperature, engine coolant is hot
and under pressure. The radiator and all lines
to heaters or the engine contain hot coolant or
steam. Any contact can cause severe burns.
Remove filler cap slowly to relieve pressure only
when engine is stopped and radiator cap is cool
enough to touch with your bare hand.
1. When the engine has cooled, loosen the filler cap
to the first stop. Allow the pressure to release from
the cooling system. Then remove the filler cap.
2. Make sure that the coolant covers the top of the
radiator core.
3. Put a suitable pressurizing Pump onto the radiator.
4. Use the pressurizing pump to increase the
pressure to an amount of 20 kPa (3 psi) more than
the operating pressure of the filler cap.
5. Check the radiator for leakage on the outside.
6. Check all connections and hoses of the cooling
system for leaks.
The radiator and the cooling system do not have
leakage if all of the following conditions exist:
•
You do NOT observe any leakage after five
minutes.
SENR9977