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Letter No 25

Passenger Car Service Letter - 1963 Series - No 25

Anglia Range
18th February 1963

Salt Contamination

All Models

During icy weather conditions salt is often used to assist in clearing snow and ice from the roads. A highly corrosive liquid is then formed by the melting snow and ice in combination with the salt and this can attack any metal surfaces onto which it is splashed. This salt solution can be thrown up by the wheels and then widely dispersed over the various parts of the vehicle. The contamination leads to corrosion, unless steps are taken such as to wash the vehicle, particularly the undercarriage parts, after it has been used in these conditions.

The initial and more obvious signs of corrosion will appear on exterior bright metal parts such as bumpers, hub caps, grilles, etc. and thorough washing and polishing, with an approved chrome cleaner, will be necessary if corrosion is to be arrested.

During and following such adverse weather conditions, periodic inspection to check for signs of corrosion should be made, particularly on items such as brake pipes, hoses and unions, stop light switches, handbrake cables, exhaust systems and all wiring connectors which may be splashed from the road. any badly corroded parts, particularly braking system components, should be renewed.

On "Anglia" and Mark II cars, "Thames" 5 and 7 cwt and "Thames Freighter" (800) vehicles, also "Thames Trader" Forward Control vehicles where the stop light switch is positioned near the underside of the vehicle, snow and slush containing salt thrown up by the wheels can accumulate around the stop light switch body and terminals. In these exceptional conditions there can be corrosive action augmented by the electroltic action between the electrical connectors and earth, resulting in erosion of the switch body to the stage where its mechanical strength is seriously reduced. In extreme cases, if neglected, this could possibly lead to fracture and consequent hydraulic brake failure. On “Thames Trader” Forward Control vehicles where the stop light wiring is routed from the right-hand side member and clipped to the clutch and brake pipes on No. 2 crossmember, snow and slush may be packed around this area, allowing an electrolytic action to take place from the loom connectors through the pipes to earth. To avoid corrosion and possible erosion at this point, the wiring should be re-routed by relocating the wiring clips from the brake pipe to the chassis frame crossmember.

 A stop light switch, incorporating a protective sleeve, has been fitted in production on “Thames Trader” Forward Control vehicles for several months to shield the switch terminals. This type of switch is also fitted to “Anglia” cars, “Thames” 5 and 7 cwt. And “Thames Freighter” (800) vehicles for operation in cold climate countries, such as North America, where these adverse conditions are frequently experienced.

The switch with the sleeve is available in service under Part Number 508E-13480

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A copy of Service Letter No 25 can be downloaded below


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