Radiator Caps

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In the normal position both the pressure and vacuum valves of the Tridon ... additional vacuum valve to allow coolant or air to return to the radiator as .... Page 6 ...
Radiator Caps 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.

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)

Always check the following prior to installing a new radiator cap: • Radiator cap style (Recovery or Non Recovery) • Radiator cap dimensions • Correct operating pressure

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 93 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).

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

kPa

4

30

7

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 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. 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.

Recovery Radiator Cap Figure 1 – Radiator cap in closed position. Top Shell Spring Disk Upper Sealing Gasket

Filler Neck Vacuum Spring

Vacuum Valve

Lower Sealing Gasket

Figure 2 – Pressure has exceeded the rated pressure releasing pressurised coolant from the radiator. Upper Sealing Gasket Pressure Spring

Figure 3 – As pressure reduces, the radiator cap additional vacuum valve allows coolant or air to return to the radiator. Upper Sealing Gasket

Vacuum Spring

Vacuum Valve

Lower Sealing Gasket

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.

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.

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. 94

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.

Identification Guide CA Series

CA Series with Safety Lever

Type Recovery cap Style Standard bayonet

Type Recovery cap Style Standard bayonet

Radiator Cap

CA, CN Series

59.0mm

29.0mm

Pressure PSI kPa 7 50 13 90 14 95 15 100 16 110 18 125 20 135 22 150

CA Series Lever

Part No. CA0750 CA1390 CA1495 CA15100 CA16110 CA18125 CA20135 CA22150

59.0mm

Pressure PSI kPa 7 50 13 90 15 100 16 110 20 135

CA0750L CA1390L CA15100L CA16110L CA20135L

Pressure PSI kPa 13 90 16 110

CB1390L CB16110L

Radiator Caps

Radiator Cap

Part No.

29.0mm

38.5mm

38.5mm

CB Series

CB Series with Safety Lever

Type Recovery cap Style Cap Small Japanese bayonet Radiator CB Series

46.0mm

Type Recovery cap Style Small Japanese Radiator Cap CB Seriesbayonet Lever

Pressure PSI kPa 13 90 15 100 16 110 17 120 18 125

Part No. CB1390 CB15100 CB16110 CB17120 CB18125

46.0mm

24.0mm

Part No.

24.0mm

28.0mm

28.0mm

CC Series

CD Series

CE Series

Type Recovery capCC Series Radiator Cap Style Extra small Japanese bayonet

Type Recovery capCD Series Radiator Cap Style Plastic screw (suits M48)

Type Recovery capCE Series Radiator Cap Style Plastic screw (suits M52)

44.0mm

58.0mm

21.0mm

Pressure PSI kPa 13 90 16 110

29.0mm

33.5mm 45.0mm

26.0mm

Part No. CC1390 CC16110

61.0mm

Pressure PSI kPa 20 135

23.0mm

49.5mm

Part No. CD20135

Note: To ensure correct product selection check vehicle application list.

Pressure PSI kPa 18 125

Part No. CE18125

95

Identification Guide CF Series

CG Series

CH Series

Type Recovery cap Radiator Cap CF Series Style Plastic screw (suits M45)

Type Recovery cap Radiator Cap CG Series Style Plastic screw (suits M45)

Type Recovery cap Radiator Cap CH Series Style Plastic screw (suits M52)

75.0mm

75.5mm

18.5mm

18.0mm

28.5mm

35.0mm 49.5mm

43.5mm

43.5mm

Pressure PSI kPa 10 70 14 95 20 135

60.5mm

Part No. CF1070 CF1495 CF20135

Pressure PSI kPa 14 95

Part No. CG1495

Pressure PSI kPa 16 110

Part No. CH16110

CJ Series

CK Series

CL Series

Type Recovery capCJ Series Radiator Cap Style Plastic screw (suits M45)

Type Recovery capCK Series Radiator Cap Style Plastic screw (suits M58)

Type Recovery capCL Series Radiator Cap Style Plastic screw (suits M53)

52.0mm

79.0mm

27.0mm

36.0mm

68.0mm

45.5mm

43.0mm

Pressure PSI kPa 16 110 18 125 20 140

Part No. CJ16110 CJ18125 CJ20140

Pressure PSI kPa 18 125

Part No. CK18125

CM Series

CN Series

Type Recovery capCM Series Radiator Cap Style Plastic screw (suits M52)

Type Non recovery cap Radiator Cap CN Series Style Standard bayonet

84.0mm

59.0mm

33.0mm

31.0mm

49.5mm

Pressure PSI kPa 16 110

96

29.0mm 49.5mm

57.5mm

38.0mm

Part No. CM16110

Note: To ensure correct product selection check vehicle application list.

Pressure PSI kPa 20 135 30 205

CL20135 CL30205

Pressure PSI kPa 4 30 7 50 10 70 13 90 15 100 20 135

CN0430 CN0750 CN1070 CN1390 CN15100 CN20135

Part No.

Part No.

CP Series

CR Series

Type Recovery capCO Series Radiator Cap Style 4 ear bayonet

Type Non recoveryCP cap Radiator Cap Series Style Large bayonet

Radiator Cap Type Non recovery CR capSeries Style Standard bayonet

59.0mm

60.0mm

81.0mm

34.5mm

29.0mm

27.5mm

38.0mm

Pressure PSI kPa 18 125

38.5mm

52.0mm

Part No. CO18125

Pressure PSI kPa 4 30 7 50 10 70

Part No. CP0430 CP0750 CP1070

Pressure PSI kPa 4 30 7 50 10 70 13 90

Part No. CR0430 CR0750 CR1070 CR1390

CS Series

CT Series

CU Series

Type Recovery capCS Series Radiator Cap Style Plastic screw (suits M48)

Type Recovery capCT Series Radiator Cap Style Plastic screw (suits M63)

Type Recovery capCU Series Radiator Cap Style Plastic screw (suits M53)

81.0mm

58.0mm

63.0mm

32.5mm

21.0mm

39.5mm 45.5mm

Pressure PSI kPa 16 110

50.0mm

63.0mm

Part No. CS16110

Pressure PSI kPa 22 150

Part No. CT22150

Pressure PSI kPa 17 120 20 135

Part No. CU17120 CU20135

CV Series

CW Series

CX Series

Type Recovery capCV Series Radiator Cap Style Plastic screw (suits M45)

Radiator Cap Type Recovery capCW Series Style Plastic screw (suits M55)

Type Recovery capCX Series Radiator Cap Style Plastic screw (suits M53)

49.5mm

28.5mm 18.5mm 34.0mm

Pressure PSI kPa 16 110 19 130

64.0mm

65.0mm

39.5mm

38.0mm

39.0mm 53.0mm

Part No. CV16110 CV19130

Radiator Caps

CO Series

Pressure PSI kPa 16 110 18 125

29.5mm 49.5mm

Part No. CW16110 CW18125

Note: To ensure correct product selection check vehicle application list.

Pressure PSI kPa 18 125

Part No. CX18125

97

Identification Guide CY Series

CZ Series

DA Series

Type Recovery capCY Series Radiator Cap Style Plastic screw (suits M52)

Type Recovery cap Radiator Cap CZ Series Style Plastic screw (suits M53)

Type Recovery capDA Series Radiator Cap Style Plastic screw (suits M50)

72.0mm

65.0mm

63.0mm

22.0mm

36.0mm

35.5mm

Pressure PSI kPa 18 125

Part No. CY18125

Pressure PSI kPa 20 140

Part No. CZ20140

Pressure PSI kPa 21 145

Part No. DA21145

DB Series

DC Series

DD Series

Type Recovery capSeries Radiator Cap DB Style Plastic screw (suits M62)

Type Recovery capDC Series Radiator Cap Style Plastic (suits M45)

Type Recovery capDD Series Radiator Cap Style Plastic screw (suits M53)

70.0mm

60.0mm

61.0mm

35.0mm

30.5mm

37.0mm

40.5mm 59.5mm

Pressure PSI kPa 20 140

30.0mm 49.5mm

42.5mm

Part No. DB20140

Pressure PSI kPa 20 140

Part No. DC20140

Pressure PSI kPa 17 120

Part No. DD17120

DE Series

DF Series

DG Series

Type Recovery cap Radiator Cap DE Series Style Plastic bayonet

Type Recovery cap Radiator Cap DF Series Style Plastic screw (suits M53)

Type Recovery cap Radiator Cap DG Series Style Plastic screw (suits M38)

87.0mm

63.0mm

29.0mm 49.0mm

41.0mm

Pressure PSI kPa 20 140

Part No. DE20140

54.0mm

46.0mm

33.0mm

98

29.5mm 48.0mm

29.5mm 49.5mm

50.5mm

Pressure PSI kPa 20 140 30 200

34.0mm

36.0mm

Part No. DF20140 DF30200

Note: To ensure correct product selection check vehicle application list.

Pressure PSI kPa 20 140

Part No. DG20140

DJ Series

Type Recovery cap DH Series Radiator Cap Style Plastic screw (suits M62)

Type Recovery cap DJ Series Radiator Cap Style Plastic screw (suits M44)

87.0mm

60.5mm

30.0mm

28.0mm

63.0mm

Pressure PSI kPa 18 130

Radiator Caps

DH Series

42.0mm

Pressure PSI kPa 18 130

Part No. DH18130

Part No. DJ18130

TRC Series – Small

TRC Series – Standard

TRC Series – Large

Type Blanking cap Style Small metal bayonet

Type Blanking cap Style Standard metal bayonet Radiator Cap TRC Series - Standard TRC10

Type Blanking cap Style Large metal bayonet

Radiator Cap

TRC Series - Small TRC11

Radiator Cap

59.0mm

46.0mm

73.0mm

9.0mm

8.0mm

Pressure PSI kPa Nil Nil

Part No. TRC11

TRC Series

9.0mm

Pressure PSI kPa Nil Nil

Part No. TRC10

Note: To ensure correct product selection check vehicle application list.

Pressure PSI kPa Nil Nil

Part No. TRC32

99