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Fig. B.5 Adjusting the plug gap with the Champion setting tool
B.13 NEW-TYPE DISTRIBUTOR
A new distributor (Part No. AEJ41), having a roller weight mechanism with a positive stop (to prevent
over advance) and no vacuum advance mechanism, has been introduced. When this distributor is
fitted, the vacuum advance pipe must be removed, and the union blanked off with blanking plug (Part
No. AEH1289).
Instructions for timing the distributor are given in Section B.7.
Before fitting a new distributor, the distributor drive shaft gears must be checked for backlash as
described in Section B.14.
B.14 CHECKING DISTRIBUTOR DRIVE SHAFT BACKLASH
When fitting a new distributor, it is most important that there should be no excessive backlash in the
distributor drive shaft gears. The backlash is checked as follows:
(1) Fabricate a pointer as shown in Fig. B.6 and secure it to a disused rotor arm with a nut and bolt.
(2) Remove the header tank hose to give access to the distributor.
(3) Lock the automatic advance mechanism by removing the cam retaining screw and refitting it with a
washer underneath its head. The washer may be made from a piece of wire .030 in. (.76 mm.)
diameter and 14 in. (28.57 mm.) long formed into a circle.
(4) Fit the rotor and pointer to the distributor and ensure that the rotor is tight on the spindle.
(5) Rotate the crankshaft until the pointer is over the flange of the camshaft cover (Fig. B.6).
(6) Turn the pointer by hand in an anti-clockwise direction and mark the limit of its travel on the
camshaft cover flange; then turn the pointer clockwise, and again mark the limit of its travel. (8) If the
distance between the two limits exceeds5/16 in. (8 mm.) the distributor drive gears must be renewed
before a new distributor is fitted.
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