MG MGA Twin Cam Workshop Manual page 7

GENERAL DATA-continued
Width ..
Thickness
Fitted gap
Clearance in groove . .
Oil control type ..
(From Engine No.
446)
Width . .
Thickness
Fitted gap
Clearance
in
groove
GUDGEON PIN
Type
Fit ..
Diameter
VALVES AND VALVE GEAR
Valves
Seat angle :
Inlet ..
Exhaust
Head diameter:
Inlet • .
Exhaust
Stem diameter:
Inlet ••
Exhaust
Valve lift
Valve stem to guide clearance:
Inlet . .
Exhaust
Valve clearance
Chain pitch and number of pitches • •
Inlet valve:
Opens
Closes
Exhaust valve:
Opens
Closes
VALVE GUIDES
Length :
Inlet
Exhaust ..
Diameter:
Inlet : Outside
Insid e
Exhaust: Outside
Inside
Fitted height a bove head:
Inlet
Exhaust • .
General D ata 2
. . ·054
to
·055
in. (1 ·
37
to I·
39
mm.).
. . ·124
to
·131
in.
(3-15
to
3·33
mm.).
. . ·008
to
·013 in.
(·20
to
·33 mm.).
. . ·0015
to
·0035
in.
(·038
to
·089
mm.).
. . Microland scraper.
. . Twin-segment scraper.
. . ·1552
to
·1562
in.
(3·94
to
3·99
mm.).
. . ·124
to
·131 in. (3·15
to
3·33
mm.).
. . ·008
to
·013
in.
(·20
to
·33
mm.).
. . ·001 5
to
·0035
in.
(·038
to
·089
mm.).
. . Fully floating.
Hand-push fit at room temperature.
·875
in.
(22·22
mm.).
. . 1·59
in.
(40·38
mm.).
1·44
in.
(36·58 rom.).
•342 in. (8·68 mm.).
·342
in.
(8·68
mm.).
·375 in. (9·52 mm.).
. . ·00155
to
·00255
in.
(·0394
to
·0635
mm.).
·00155
to
·00255 in. (·0394
to
·0635
mm.).
·014
to
·01 5
in.
(·356
to
·381
mm.) (cold).
·375
in.
(9·52
mm.),
132
pitches.
20° B.T.D.C.
50° A.B.D.C.
50° B.B.D.C.
20° A.T.D.C.
2-/r
in. (52·39
mm.).
2-if
in.
(61 ·91
mm.).
·5645
to
·5655
in. (14·33 to 14·36 mm.).
·3438
to
·3443
in.
(8·73
to
8·74
mm.).
·5645
to
·5655
in.
(14·33 to 14·36 mm.).
·3438
to
·3443
in.
(8·73
to
8·74
mm.).
·750
in.
(19-()5
mm.).
·844 in. (21·43
mm.).
MGA (Twin Cam). Issue 4. 32403