G15 Technical Guide - cooling Cooling System Standard capacity 14 pints so 25% anti-freeze/corrosion inhibitor is 3.5 pints. 7lb pressure cap. Modifications Larger header tank plus catch tank. Fit a flat cap onto the header tank. Fit a pipe from the overflow tube on the header tank neck to the bottom of the catch tank. A Triumph sourced item fits nicely on the left-hand chassis rail. Fit the 7lb cap onto the catch tank and keep that tank half-full and the header tank topped up. With this arrangement the system will self bleed itself - especially if the rear of the car is jacked up whilst the system is filled. Cooling pipe specification 6 x 90° bend and 1 x 135° bend silicone hoses 36" straight silicone hose Heater hose (depends on spec) 22 feet of 1" x 16swg alumnium pipe 1" x 1" x 1/2" 'T' piece 5/8" to 1/2" reducer (if required) 30 x 35mm hose clips 20mm/22mm hose clips (depends on spec) 8 x chassis grommets |
Ali pipes cutting list
| A = 9" | B = 16.5" | C = 13.5" | D = 80" | E = 75" |
| F = 35" | G = 6" | H = 4.5" (x2) | I = 9" (x2) |
Header tank
| Engine: | I pipe (x2) | 2 x 4" silicone | 1 x 90° silicone | 6 x 35mm clips |
| Main pipe: | A, B & C pipes | 1 x 4" silicone | 2 x 90° silicone | |
| 1 x 135° silicone | 8 x 35mm clips |
Water pump to main pipe F pipe 1 x 90° silicone 1 x 4" silicone 4 x 35mm clips
Radiator
| Bottom: | H pipe | 2 x 4" silicone | 'T' outlet | |
| 1 x 6" silicone | 6 x 35mm clips | |||
| Top: | H & G pipes | 2 x 90° silicone | ||
| 1 x 12" silicone | 6 x 35mm clips |
Heater
| Stromberg or heated 28/36 manifold: | 51" x 5/8" hose | 8.5" x 5/8" hose | 4 x 22mm clips |
| Non-heated manifold: | 2 stainless 5/8" stops | 2 x 4" x 5/8" hose | 4 x 22mm clips |
| + either: | 54" x 1/2" hose | 2 x 20mm clips | 1/2" - 5/8" reducer |
| 71" x 5/8" hose | 2 x 22mm clips | ||
| or: | 125" x 1/2" hose | 2 x 20mm clips |
Radiator: The standard G15 radiator was custom made, get it recored locally.
Alternative radiator: Use Fiesta Mk 2 950/1100 radiator, part no. SER 2359041. Fiesta radiator modifications and mounting
Heater: The standard heater was a GT6 item held in position by a Ginetta moulding. The heater doesn't work as well as it should because it takes air from a low-pressure area. Exploded view of heater.
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