MG MGB TOURER GHN5 Handbook page 110

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Supplement for Cars with Impact-absorbing Bumpers
Re-connect the terminal plate (13) to the end of the contact breaker spring,
position the contact set on the distributor base plate and highly tighten securing
screw (I I). Ensure that the contact breaker spring is firmly in its register on the
insulator, and set the contact gap.
Whenever a new contact set has been fitted, re-check the gap after the first
500 miles (800 km). During this period the heel of the contact will have bedded-
in and reduced the gap.
GENERAL DATA
Engine
Type
. . . .
. .
. .
. .
18V 846F Standard
18V 847F Overdrive
Idle speed
. .
. .
. .
. .
750 r.p.m.
Fast idle speed
.
.
.
.
. .
1,300 r.p.m.
Ignition
Stroboscopic ignition timing
.
.
10" B.T.D.C. at 1,000 r.p.m.
Timing marks
. .
. .
. .
Notch on crankshaft pulley, pointers on
timing chain cover
Contact breaker gap
. .
. .
0.014 to 0,016 in. (0.36 to 0.41 mm.)
Sparking plugs
. .
,
.
. .
Champion N-9Y
Plug gap
. .
. .
.
.
. .
0.035 in. (0.90 mm.)
. . . .
Fuel system
Carburetters
.
.
. .
Two S.U. type HIF4
Needle
. .
. .
. .
. .
ACD
Recommended octane rating
. .
97 and above
Exhaust gas content (carbon mon-
oxide) at idle speed
.
.
. .
3 %

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