MG MGB - Cooling System; Ignition System

GENERAL
DATA—continued
(l8G/180A—continued)
Suction
head
..
.. ..
..
..
.. .. ..
2
ft.
6
in.
(76.2 cm.).
Delivery
head.
.. .. .. ..
.. .. .. ..
4
ft. (122 cm.).
Minimum
starting
voltage
..
.. .. ..
.. ..
9.5 volts.
Type
(Later cars)
.. .. .. ..
.. .. ..
..
S.U. electric
AUF
300.
Minimum
■ow
.. ..
.. .. .. ..
.. ..
15
gal/hr.
(68.2 litre/hr.
18 US.
gal./hr.).
Suction
head
.. .. ..
.. .. .. ..
..
18
in.
(457 mm.).
COOLING SYSTEM
Type
.
I
Pressurized.
Pump—impeller—
and
fan-assisted.
Thermostat
setting
Standard
.. .. .. .. .. ..
.. ..
..
74°C.
(165°F.).
Hot climate
.. .. .. .. ..
.. ..
..
74°C.
(165
°F.).
Cold
climate
.. ..
.. .. .. .. ..
..
82°C. (180°F.).
Pressure
cap
.. .. ..
.. .. ..
.
..
.. ..
7
lb.
(3.175 kg.).
Fan blades
.. ..
.. .. .. .. ..
.. ..
3
at
24°.
Fan
belt: Width
.. .. .. ..
.. ..
.. ..
%
in.
(9.5 mm.).
Outside length.
.. .. .. ..
.. ..
351/2
in.
(90.2
cm.).
Thickness
..
..
..
.. .. ..
..
7%
in.
(7.9 mm.).
Tension
.. .. .. .. ..
.. .. ..
1/2
in.
(12.8
mm.).movement.
Type
of
pump
.. .. .. .. .. ..
.. .. ..
Centrifugal.
Pump drive
.. ..
.. .. .. .. ..
.. ..
Belt
from
crankshaft
pulley.
IGNITION SYSTEM
Coil
..
.. .. .. .. ..
.. .. .. ..
HA.12
(oil-filled).
Resistance
at
20°C.
(68°F):
Primary
winding
.. .. ..
3.1
to
3.5 ohms
(cold).
Consumption:
Ignition switch
on
.. ..
.. .. ..
3.9
amps.
At 2,000
r.p.m.
.. .. ..
.. ..
1.4
amps.
Distributor
. ..
..
..
25D4.
Rotation of
rotor
.. .. ..
.. .. ..
..
Anti-clockwise.
Cam form
.. ..
..
..
.. .. ..
..
..
4-cylinder high-lift.
Cam closed
period
.. .. .. ..
.. ..
..
60°i3°.
Cam
opened period
.. .. ..
.. .. ..
..
30 i3
°.
Automatic advance
.. .. .. ..
.. ..
..
Centrifugal
and
vacuum.
Serial
Number
Serial
Number
.
40897
(H.C.)
40916
(L.C.)
Automatic advance
commences
.. ..
.. .. ..
400
r.p.m.
400
r.p.m.
Maximum advance
(crankshaft degrees)
.. ..
.. ..
20°
at
200
r.p.m.
24°
at,4,400
r.p.m.
Vacuum
advance
(crankshaft
degrees)
.. .. ..
..
20°
at
13
in.
(33.3
cm.)
16°
at
12 in.
(30.5
cm.).
Hg.
Hg.
Decelerating
check (crankshaft
degrees,
engine
r.p.m.)
..
20°at
2,200
r.p.m.
24°
at
4,400
r.p.m.
15
°'
at
1,600
r.p.m.
18°
at
3,000
r.p.m.
9°
at
900
r.p.m.
9°
at
1,000
r.p.m.
6°
at
700
r.p.m.
8°
at
800
r.p.m.
6°
at
600
r.p.m.
6°
at
600
r.p.m.
Contact
point
gap
setting
..
.. .. ..
.. ..
.014
to
.016
in.
(.35
to
.40 mm.).
Breaker
spring tension
..
.. .. .. ..
.. ..
18
to
24
oz.
(510
to
680 gm.)
Condenser
capacity
.. .. ..
.. .. ..
..
.18
to
.24
mF.
Timing marks
.. .. .. ..
.. .. ..
..
Pointer
on
timing
chain
case
and notch
on
crankshaft
pulley.
Static
ignition timing:
H.C.
.. .. .. ..
.. ..
10°-B.T.D.C.
(98/100-octane
fuel).
L.C.
..
.. .. .. ..
..
8
°B.T.D.C.
(95/97-0ctane
fuel).
Stroboscopic
ignition timing:
H.C.
.. .. ..
.. ..
14° B.T.D.C.
at
600
r.p.m.
'
L.C.
..
.. .. .. ..
12°
B.T.D.C.
at
600
r.p.m.
Suppressors
.. .. .. .. ..
.. .. .. ..
Lucas
W55 Type L.2. Fitted
in
plug
leads.
Sparking plugs
.. .. .. .. .. ..
.. .. ..
Champion N-9Y.
Size
..
.. .. .. .. .. .. ..
.. ..
14
mm.
%
in.
(19.0 mm.)
reach.
Gap
.. .. .. .. ..
.. .. .. .. ..
.024
to
.026
in.
(.625
to
.660
mm.).
MGB.
Issue6. 69615