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Important: When replacing a pressure cap make sure it is of the same pressure range as the original
equipment cap.
Important: Make sure both filler neck cams are not bent or distorted in any way. This will affect the seal of the
cap, causing it to leak or hold no pressure. Even one bent cam will affect the seal.
If both cams are bent down to the same extent, the cap will seal. But, because the pressure valve spring is compressed
more it will seal at a higher pressure. The cap will seal at a low pressure if both cams are bent upward to the same
extent. Bent cams can also cause problems during removal of the cap.
REASONS FOR OVERHEATING CAUSED BY WATER LOSS
1. Non-recommended anti-freeze material. Low boiling point anti-freeze with a high temperature thermostat.
2. Defective radiator. Radiator overflow overfilled. Water passage in radiator core is clogged. Engine water jackets.
3. Obstructed hoses or loose connections. Can be caused by interior deterioration.
4. Defective water pump.
5. Defective or missing fan blades.
6. Defective pressure cap.
7. Radiator core air passages clogged by debris. (May be cleared with a garden hose or air pressure).
8. Gasket leakage in thermostat housing. Defective thermostat.
9. Broken, loose or missing fan belt.
10. Low level oil or wrong grade of gasoline.
11. Faulty ignition or engine improperly timed.
12. Distributor or automatic vacuum control not operating properly.
13. Damaged head gasket. Loose head bolts. Defective or cracked engine block or cylinder head.
14. Frequent starts and stops in heavy traffic, excessive idling, high speeds on hot days, heavy loads, dragging brakes
- an overheated engine. All the above are emphasized at higher altitudes.
THE DIFFERENT PRESSURE CAPS
THE SWIVEL TYPE
The swivel type radiator cap is the replacement cap to the conventional round shell radiator cap. This type of cap is
easier to install and remove and can be used in open and closed systems alike.
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