MG MGB User Manual

ENGINE
TUNING
DATA
18V 581Y, 18V
582Y,
AND
18V
583Y
ENGINES
ENGINE
Type
Displacement
..
Firing
order
..
..
Compression
ratio:
H.C.
L.C.
Cranking
pressure
Idle
speed
..
.. ..
..
Valve
rocker clearance: Set
cold
..
Set
hot
..
Static
ignition
timing:
H.C.
L.C.
Stroboscopic ignition timing:
H.C.
L.C.
Timing
mark location
DISTRIBUTOR
Make/Type
.
Contact
breaker
gap
..
Contact
spring
tension
Rotation
of
rotor
Dwell angle
Centrifugal advance
Crankshaft
degrees/Speed (vacuum
pipe
disconnected)
Vacuum
advance
S
tar ts
Finishes
Total
crankshaft
degrees
IGNITION
COIL
Make/Type
Resistance:
Primary
..
SPARKING PLUGS
Make/Type
Gap
CARBURETI‘ERS
Make/Type
Jet
,
..
..
.. ..
.
Needle
..
..
..
.. .
‘
.
Piston
spring
ELECTRICAL
Alternator
Battery
..
..
Volts/Polarity
..
Starter
MGB. Issue
3.
86842
18V.
109.8
cu.
in.
(1798
c.c.).
l, 3, 4, 2.
9.0
:
1.
8.0
:
1.
Nominal 170
lbf./sq.
in.
(11.95
kgf./cm.2)
at
275
r.p.m.
750
to
800
r.p.m.
.015
in.
(.38 mm.).
.013
in.
(.33 mm.).
10°
B.T.D.C.
10°
B.T.D.C.
13°
B.T.D.C.
at
600
r.p.m.
13°
B.T.D.C.
at
600
r.p.m.
Pointer
on
timing
case,
notch
on
crankshaft pulley.
Lucas/25D4.
.014
to
.016
in.
(.35
to
.40
mm.).
18
to
24
oz.
(510
to
680
gm).
Anti-clockwise.
60°t3°.
SERIAL NUMBER
SERIAL NUMBER
41288
(H.C.)
41290
(L.C.)
0
to
6°
at
600
r.p.m.
0
to
6°
at
600
r.p.m.
4
to
9°
at
700
r.p.m.
6
to
10°
at
800
r.p.m.
7
to
11°
at
900
r.p.m.
7
to
11°
at
1,000
r.p.m.
13
to
17°
at
1,600
r.p.m.
16
to
20°
at
3,000
r.p.m.
18
to
22°
at
2,200
r.p.m.
22
to
26°
at
4,400
r.p.m.
5
in.
Hg 4 in.
Hg
(127
mm.
Hg).
(101.6
mm.
Hg).
13
in.
Hg
12 in.
Hg
(330.2
mm.
Hg). (304.8
mm.
Hg).
20°:l:2°.
16°:t2°.
Lucas/HA
12.
3.1
to
3.5 ohms
at
20°C. (68° F.).
Champion/N9Y.
.024
to
.026
(.625
to
.66
mm.).
SU/HIF4.
.090
in.
(2.2 mm.).
AAU.
Red.
Lucas 16ACR.
Lucas
BT9E,
BTZ9E, CA9E, SG9E
or
Exide 3XCK9L.
12
volt/NEGATIVE
earth.
Lucas
2M
100 Pre-engaged.
Engine
Tuning
Data
5

MG MGB Specifications

General

Brand	MG
Model	MGB
Category	Automobile
Language	English