Manual gearbox oil level check (Every 12 000 miles (20 000 km) or 12 months)

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.

3 Wipe clean around the filler/level plug.

Unscrew the plug and remove it (see illustration).

18.3 Gearbox filler/level plug location (arrowed) - N type gearbox
18.3 Gearbox filler/level plug location (arrowed) - N type gearbox

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.

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