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Fig. B.1 The method of connecting H.T. leads MGA (Twin Cam)
B.4 HIGH-TENSION CABLES
The high-tension cables must be examined carefully and any which have the insulation cracked,
perished, or damaged in any way must be renewed.
To fit the cables to the terminal of the ignition coil thread the knurled moulded terminal nut over the
lead, bare the end of the cable for about 4 in. (6 mm.), thread the wire through the brass washer
removed from the original cable, and bend back the strands over the washer. Finally, screw the
terminal into the coil.
To make the connections to the terminals in the distributor moulded cap, first remove the cap and
slacken the screws on the inside of the moulding till they are clear of the cables. Cut the new cables
off to the required length, push them completely home, and tighten the securing screws.
The cables from the distributor to the sparking plugs must be connected in the correct firing order,
which is 1, 3, 4, 2. Secure them firmly to the connectors.
B.5 CONTACT BREAKER
The distributor has a pre-tilted contact breaker unit. The moving contact breaker plate is balanced on
two nylon studs and the angle through which the plate may be tilted is controlled by a stud riveted to
the moving contact breaker plate locating in a slot in the base plate. The plate carrying the fixed
contact is secured by one screw only.
After the first 500 miles (800 km.) and subsequently every 6,000 miles (9600 km.) check the contact
breaker as follows:
1. Rotate the crankshaft until the contact breaker points are fully opened and check the gap with
a gauge having a thickness of .014 to .016 in. (.35 to .40 mm.). If the gap is correct the gauge
should be a sliding fit. Do not alter the setting unless the gap varies considerably from the
gauge thickness.
To adjust the setting keep the engine in the position which gives maximum opening of the
contacts, then slacken the fixed contact plate securing screw and adjust the contact gap by
inserting a screwdriver in the notched hole and turning clockwise to reduce the gap and
anticlockwise to increase it. Tighten the securing screw.
2. If the contacts are dirty or pitted they must be cleaned by polishing them with a fine
carborundum stone and afterwards wiping them with a cloth moistened with petrol (gasoline).
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