Cooling System Hoses and Clamps.

1. NOTE: Remember that the cooling system hoses operate under a positive pressure of approximately 90 kPa (13-16 psi), temperatures of over 95°C (200°F), and are subject to considerable vibration. Any hoses with cuts or deterioration should be replaced as they are likely to fail on the road with the attendant risk of engine damage.

   Inspect hoses for:

   • Visible signs of deterioration such as cracking or checking. Replace if there is visible deterioration.
   • Swelling near clamps and at hose ends. Replace if there is swelling.
   • Oil or oily dirt on hoses from engine oil leaks or careless filling. Clean off oil and oily dirt on hoses. Oil will attack rubber over time. If there is weakening or deterioration of a hose, replace it.
   • Cuts. If cut on hose is other than a very superficial cut, replace hose.
   • Hose contacting metal parts, especially sharp edges. If contacting metal parts, loosen clamps and relocate hose. In some cases it may be necessary to put plastic shielding on hose to protect it. If hose has already been cut or worn, it should be replaced.

2. NOTE: Reasonably fresh replacement hoses should be used. Replacement hoses that have been in storage for several years should be checked for ozone-caused hardening. Hoses which have become hard will be difficult to seal and may break in service.

   Inspect clamps. Replace as necessary.