MG MGB TOURER GHN5 Handbook page 109

Distributor
Release the retaining clips and remove the distributor cover. Remove the rotor
Fig. l2 arm (l).
Cleaning contacts. Inspect the contact points (2), and if burned, clean with fine
emery cloth or a fine carborundum stone. Wipe the contacts clean with a fuel-
moistened cloth. Renew the contact set if the points are pitted or worn.
Lubrication. Very lightly smear the cam (3) and pivot post (4) with grease. Add
a few drops of oil to the felt pad (5) in the top of the cam spindle and through
the gap (6) between the contact plate and the cam spindle to lubricate the cen-
trifugal weights.
Do not oil the cam wiping pad.
Every 24,000 miles (40000 km), in addition to the routine maintenance, lubricate
the contact breaker assembly centre bearing with a drop of oil in each of the
two holes in the base plate (7).
Carefully wipe away all surplus lubricant and see that the contact breaker points
are perfectly clean and dry.
Contact gap. Turn the crankshaft until the points are fully open. Check the
contact gap (2) with a feeler gauge (see 'GENERAL DATA'); the gauge should
be a sliding fit. If the gap varies appreciably from the gauge thickness, slacken
the contact set securing screw (8) and adjust the gap by inserting a screwdriver
between the slot at the end of the plate and the pip; turn anti-clockwise (9) to
increase and clockwise (10) to decrease the gap. Re-tighten the securing screw.
Refit the rotor arm, engage the slot in the spindle and push down firmly. Wipe
the inside and outside of the distributor cover clean-particularly between the
electrodes, and refit the cover.
Contact set renewing. Remove the securing screw (11) with its spring and flat
washer, lift the contact set (12), press the spring and release the terminal plate (13)
from the end of the spring. Before fitting the new contact set wipe the points
clean with fuel or methylated spirit and very lightly grease the pivot post (4).
Fig. 12