Ford Sierra - Manual gearbox oil level check

1 Place the vehicle over a pit, or raise and support it at front and rear. The vehicle must be level for an accurate check.
2 If the gearbox is hot after a run, allow it to cool for a few minutes. This is necessary because the oil can foam when hot and give a false level reading.
Gearbox filler/level plug location (arrowed) - N type gearbox 3 Wipe clean around the filler/level plug. Unscrew the plug and remove it (see illustration).
4 Using a suitably marked piece of bent wire as a dipstick, check that the oil level is as shown in the table at the top of this page, according to gearbox type.
5 Top-up the level if necessary, using clean oil of the specified type. Do not overfill, as this can lead to leakage and difficult gear changing. Allow excess oil to drip out of the filler/level hole if necessary. Refit and tighten the filler/level plug on completion.
6 The frequent need for topping-up can only be due to leaks, which should be rectified. The most likely sources of leaks are the rear extension housing and input shaft oil seals.
7 No periodic oil changing is specified, and no drain plug is fitted.

Gearbox type Oil level
All four-speed gearboxes 0 to 5.0 mm (0 to 0.2 in) below lower edge of filler/level hole
All five-speed gearboxes up to April 1984 (build code E6) except those subsequently fitted with a modified extension housing Level with bottom edge of filler/level hole
All five-speed gearboxes from May 1984 (build code EC) to end of April 1985 (build code FP) and all vehicles built up to April 1984 (build code E6) subsequently fitted with a modified gearbox extension housing 20.0 to 25.0 mm (0.79 to 0.99 in) below lower edge of filler/level hole
All five-speed gearboxes from May 1985 0 to 5.0 mm (0 to 0.2 in)below lower edge of filler/level hole

Note: The vehicle build code appears as the twelfth and thirteenth characters of the VIN number on the plate in the engine compartment.

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