The Tridon radiator cap range has been developed to operate within original equipment manufacturer’s specifications. Photographs and technical specifications are shown for each Tridon part number. The Tridon radiator cap range contains 74 part numbers available in metal or plastic design suitable for use on sealed, recovery vehicle cooling systems or open, non recovery vehicle cooling systems. As the radiator cap must be compatible with the vehicle cooling system, always refer to the vehicle application list to ensure the correct part number is selected. TRIDON > Radiator Caps Selection The radiator cap is designed to seal the cooling system to prevent coolant loss, maintain pressure within the cooling system and raise the boiling point of the coolant. Radiator caps are manufactured to a predetermined pressure rating, utilising either metal or plastic design, and are suitable for use on sealed recovery or open non recovery vehicle cooling systems. The Tridon radiator cap range has been developed to operate within original equipment manufacturer’s specifications. As the radiator cap must be compatible with the vehicle cooling system, always refer to the vehicle application list to ensure the correct part number is selected. Failure to use the correct radiator cap may result in severe engine damage. Recovery Caps (double seal) In a sealed or recovery cooling system the recovery radiator cap (double seal) allows coolant to flow to and from the recovery or expansion tank, maintaining the integrity of the cooling system. In a correctly operational recovery cooling system, coolant checks are only required at OEM recommended service intervals as the coolant is maintained within the system. Non Recovery Caps (single seal) The open or non recovery cooling system does not have a recovery or expansion tank; the non recovery radiator cap (single seal) allows the release of coolant and the return of air to the cooling system. The non recovery cooling system requires regular coolant checks and replacement to ensure the system does not run dry. NOTE: A recovery radiator cap (double seal) may be used on a non recovery system, however a non recovery radiator cap cannot be used on a recovery cooling system. Safety Lever Radiator Caps Safety Lever Caps are suitable for both performance and mining applications preventing scalding and burns during cap removal. This cap has an inbuilt lock where the lever must be lifted prior to turning to enable the cap to be removed. Safety lever caps feature a stainless body and brass pin to conform to mining requirements. The cap contains no aluminium components. All lever caps are recovery style covering standard bayonet and small bayonet Japanese (CA, CB series). There are 7 part numbers available in lever style caps (refer to page 95 for range and pressures). Always check the following prior to installing a new radiator cap: • Radiator cap style (Recovery or Non Recovery) • Radiator cap dimensions • Correct operating pressure Additional vehicles and applications may have been introduced after the time of catalogue printing. For complete, up to date vehicle application listings refer to the Tridon website www.tridon.com.au (or www. tridon.co.nz) and go to Tridon Part Finder. Pressure Rating Always replace the cap with the same pressure rating as recommended by the vehicle manufacturer. Each additional pound of pressure above the specified pressure increases the boiling point of the coolant by 1.4°C or 2.5°F. Generally caps are designed from 4PSI (30kPa) to 30PSI (205kPa). Pressure Conversion PSI I kPa 30 50 10 70 13 90 14 95 15 100 16 110 17 120 18 125/130 19 130 20 135/140 21 145 22 150 30 200/205 93 Function Recovery Radiator Cap In the normal position both the pressure and vacuum valves of the Tridon cap remain closed (Figure 1). The pressure in the cooling system rises as the temperature rises. When the pressure begins to exceed the caps rated pressure, the pressure valve opens (Figure 2) releasing pressurised coolant from the radiator into the recovery or expansion tank. Figure 1 - Radiator cap in closed position. Top Shell -\ The pressure valve closes as the excess cooling system pressure reduces. The cycle of opening and closing the pressure valve continues, maintaining the appropriate system pressure and protecting cooling system components from over pressurisation. As the system cools down cooling system pressure reduces, creating negative cooling system pressure. Negative pressure can cause radiator tanks and hoses to collapse leading to damage to the cooling system. To prevent damage, Tridon radiator caps have an additional vacuum valve to allow coolant or air to return to the radiator as the pressure reduces (Figure 3). This serves a dual purpose of allowing the cooling system pressure to equalise as well as allowing coolant to return to the radiator. Figure 2 - Pressure has exceeded the rated pressure releasing pressurised coolant from the radiator. Pressure Spring Figure 3 - As pressure reduces, the radiator cap additional vacuum valve allows coolant or air to return to the radiator. Radiator Cap Test Procedure For correct radiator cap testing a commercial type radiator cap and coolant system tester is required. For details on cooling system and radiator cap testers see service tools section page 117, including Toledo and Sykes Pickavant cooling systems and cap pressure testers. Step 1 Select the hand pump gauge assembly. Step 2 Select cap adaptor if required and attach to pump. Step 3 Moisten seals and connect cap to adaptor or pump. Step 4 Pump to exceed cap nominated pressure by 30%. Cap should blow off and return to nominated pressure. Step 5 Pressure should hold at the nominated pressure. Note: There is a tolerance of 1-2PSI either side of the nominated pressure rating. Retest cap to verify results. The cap should be replaced if: 1. The pressure is exceeded and it does not fall back to the nominated pressure tolerance of 1-2PSI. 2. The cap does not hold any pressure, i.e. needle on pump immediately returns to zero. 3. The cap falls outside the 1-2 PSI tolerance in holding pressure. 94 Identification Guide CA Series Type Recovery cap Style Standard bayonet CA Series with Safety Lever Type Recovery cap Style Standard bayonet 59.0mm Pressure Part No. PSI kPa 7 50 CA0750 13 90 CA1390 14 95 CA1495 15 100 CA15100 16 110 CA16110 18 125 CA18125 20 135 CA20135 22 150 CA22150 29.0mm 59.0mm Pressure Part No. PSI kPa 7 50 CA0750L 13 90 CA1390L 15 100 CA15100L 16 110 CA16110L 20 135 CA20135L 38.5mm 38.5mm 29.0mm CB Series Type Recovery cap Style Small Japanese bayonet CB Series with Safety Lever Type Recovery cap Style Small Japanese bayonet Pressure Part No. PSI kPa 13 90 CB1390 15 100 CB15100 16 110 CB16110 17 120 CB17120 18 125 CB18125 24.0mm 28.0mm 46.0mm Pressure Part No. PSI kPa 13 90 CB1390L 16 110 CB16110L a w 24.0mm 28.0mm CC Series Type Recovery cap Style Extra small Japanese bayonet CD Series Type Recovery cap Style Plastic screw (suits M48) CE Series Type Recovery cap Style Plastic screw (suits M52) 44.0mm 58.0mm 61.0mm 26.0mm 21.0mm 29.0mm 23.0mm 33.5mm 45.0mm 49.5mm Pressure Part No. PSI kPa 13 90 CC1390 16 110 CC16110 Pressure Part No. PSI kPa 20 135 CD20135 Pressure Part No. PSI kPa 18 125 CE18125 Note: To ensure correct product selection check vehicle application list. Radiator Caps Identification Guide CF Series Type Recovery cap Style Plastic screw (suits M45) 75.0mm 18.5mm Pressure Part No. PSI kPa 10 70 CF1070 14 95 CF1495 20 135 CF20135 CG Series Type Recovery cap Style Plastic screw (suits M45) 75.5mm 18.0mm Pressure Part No. PSI kPa 14 95 CG1495 CH Series Type Recovery cap Style Plastic screw (suits M52) 60.5mm 43.5mm 43.5mm 1 35.0mm 49.5mm 28.5mm Pressure Part No. PSI kPa 16 110 CH16110 CJ Series Type Recovery cap Style Plastic screw (suits M45) 43.0mm 52.0mm 27.0mm Pressure Part No. PSI kPa 16 110 CJ16110 18 125 CJ18125 20 140 CJ20140 CK Series Type Recovery cap Style Plastic screw (suits M58) 79.0mm 36.0mm 57.5mm Pressure Part No. PSI kPa 18 125 CK18125 CL Series Type Recovery cap Style Plastic screw (suits M53) 68.0mm 45.5mm 29.0mm 49.5mm Pressure Part No. PSI kPa 20 135 CL20135 30 205 CL30205 CM Series Type Recovery cap Style Plastic screw (suits M52) 49.5mm Pressure PSI 16 kPa 110 84.0mm 33.0mm Part No. CM16110 CN Series Type Non recovery cap Style Standard bayonet 59.0mm 38.0mm 31.0mm Pressure Part No. PSI kPa 4 30 CN0430 7 50 CN0750 10 70 CN1070 13 90 CN1390 15 100 CN15100 20 135 CN20135 Note: To ensure correct product selection check vehicle application list. CO Series Type Recovery cap Style 4 ear bayonet CP Series Type Non recovery cap Style Large bayonet CR Series Type Non recovery cap Style Standard bayonet 81.0mm 59.0mm 38.0mm 29.0mm Pressure Part No. PSI kPa 18 125 C018125 52.0mm 27.5mm 34.5mm Pressure Part No. PSI kPa 4 30 CP0430 7 50 CP0750 10 70 CP1070 38.5mm Pressure Part No. PSI kPa 4 30 CR0430 7 50 CR0750 10 70 CR1070 13 90 CR1390 CS Series Type Recovery cap Style Plastic screw (suits M48) CT Series Type Recovery cap Style Plastic screw (suits M63) 58.0mm CU Series Type Recovery cap Style Plastic screw (suits M53) 81.0mm 63.0mm 32.5mm 39.5mm 21.0mm _ 45.5mm 63.0mm 50.0mm Pressure Part No. PSI kPa 16 110 CS16110 Pressure Part No. PSI kPa 22 150 CT22150 Pressure Part No. PSI kPa 17 120 CU17120 20 135 CU20135 CV Series Type Recovery cap Style Plastic screw (suits M45) CW Series Type Recovery cap Style Plastic screw (suits M55) CX Series Type Recovery cap Style Plastic screw (suits M53) 49.5mm 34.0mm 28.5mm Pressure Part No. PSI kPa 16 110 CV16110 19 130 CV19130 64.0mm 39.5mm 39.0mm 53.0mm Pressure Part No. PSI kPa 16 110 CW16110 18 125 CW18125 f % i I & i * *•* A 65.0mm 29.5mm 49.5mm 38.0mm Pressure Part No. PSI kPa 18 125 CXI 8125 Note: To ensure correct product selection check vehicle application list. 97 Identification Guide CY Series Type Recovery cap Style Plastic screw (suits M52) 50.5mm Pressure Part No. PSI kPa 18 125 CY18125 CZ Series Type Recovery cap Style Plastic screw (suits M53) 65.0mm 36.0mm 29.5mm 49.5mm Pressure Part No. PSI kPa 20 140 CZ20140 DA Series Type Recovery cap Style Plastic screw (suits M50) Am Up* 63.0mm 48.0mm 35.5mm Pressure Part No. PSI kPa 21 145 DA21145 DB Series Type Recovery cap Style Plastic screw (suits M62) 70.0mm 35.0mm 40.5mm 59.5mm Pressure Part No. PSI kPa 20 140 DB20140 DC Series Type Recovery cap Style Plastic (suits M45) 42.5mm 60.0mm 30.5mm Pressure Part No. PSI kPa 20 140 DC20140 DD Series Type Recovery cap Style Plastic screw (suits M53) 37.0mm 30.0mm 49.5mm Pressure Part No. PSI kPa 17 120 DD17120 DE Series Type Recovery cap Style Plastic bayonet 1 63.0mm 33.0mm 41.0mm Pressure Part No. PSI kPa 20 140 DE20140 DF Series Type Recovery cap Style Plastic screw (suits M53) 29.0mm I 49.0mm Pressure PSI kPa 20 140 30 200 87.0mm 46.0mm Part No. DF20140 DF30200 DG Series Type Recovery cap Style Plastic screw (suits M38) 54.0mm 34.0mm 36.0mm Pressure Part No. PSI kPa 20 140 DG20140 98 Note: To ensure correct product selection check vehicle application list. Note: To ensure correct product selection check vehicle application list. Radiator Caps