MG MGB User Manual

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THE

ENGINE

A

Fig.

A.11

Crank

the

engine

until the

timing

dimples

(1)

and (2)

are

opposite

each

other

before

removing

the

timing

chain

and

chain

wheels.

The

chain

tensioner

is

retracted

into

the

unloaded

position

by

turning the

Allen

key

(3) in

a

clockwise

direction

Fit

a new

cylinder

head

gasket

when

replacing

the

head

if

the

old has

been

damaged,

noting

that

the

gasket

is marked

to

indicate the

top

face

and

the front

end.

Section

A.10

VALVE

TIMING

GEAR

AND

CHAIN

TENSIONER

Timing

chain

cover

Drain

the

cooling

system

and

remove

the

radiator—Section

C

.7.

Slacken

the

dynamo

or

alternator

securing

bolts

and

remove

the fan

belt.

On

18GB

and later

engines,

remove

the

bolts

securing

the

steering-rack

t0

the

body

and

ease

the

rack

assembly

forward

suf■ciently

to

allow

the

crankshaft

pulley

to

be

withdrawn.

Fig.

A.12

Replacing

the

oil

seal

in the

crankcase

front

cover

using

Service

tool ISO

134 and

adaptor

18G

134

BD

MGB.

Issue4.

15676

Unlock the

crankshaft pulley

retaining bolt,

unscrew

the

bolt

using

tool

18G

98 A and

withdraw

the

pulley.

Unscrew

the

timing

cover

retaining bolts

and

remove

the

cover.

Use

a new

gasket

when

refitting

the

timing

cover.

The felt

washer

or

oil

seal

(later

cars)

in

the

timing

cover

should

also be

renewed if

necessary.

Ensure

that

the

oil thrower

behind

the

crankshaft

pulley

is

fitted

with

the face

marked

‘F’

away

from

the

engine.

Replacement

of the

timing

cover

is

a

reversal of

the

above

procedure.

When

refitting

the

cover

it

is important

to

ensure

that

the

seal,

rubber

or

felt,

is

centralized

on

the

crankshaft,

and

a

Service

tool (18G

1046)

is available

for

the

purpose.

NOTE—The

early

type

front

cover

and oil

thrower

must

be

used

together.

When

refitting,

ensure

that

the

oil thrower

is

fitted

with

its

concave

side facing

away

from

the

engine.

Use

Service

tool 18G

3

to

centralize

the

rubber

seal

on

the

crankshaft,

or

use

the

crankshaft

pulley

as

follows:

Whirl“

_

will

murmur!"

1h

""lllunm

.

\

a

\

u,

I

.\

yumm-

Fig.

A.l3

Install

the

securing

screws

finger

tight

and

centralize the

crankcase

front

cover

with

the

crankshaft,

using

Service

tool

186

1046

If

a

rubber

seal

is

fitted

■ll

the

annular

groove

between

the

lips

with

grease.

Lubricate

the hub

of

the

pulley

and

push

it

into

the

seal,

at

the

same

time

turning

it

to

avoid damaging

the

felt

or

the

lips

of

a

rubber

seal.

Slide the

pulley

onto

the

shaft

with

the

keyway

in

line

with

the

key

in the

crankshaft.

Turn

the

cover

as necessary

to

align

the

set

screw

holes

with

those

in

the

crankcase,

taking

care

not

to

strain

the

cover

against the

■exibility

of

the

seal.

Insert

the

set

screws

and

tighten

up.

Refit

and

tighten

the

pulley

securing

screw.

Timing

chain

Remove

the

bottom

plug from

the

chain

tensioner,

insert

a

i

in.

(3.18

mm.)

Allen

key

in

the

cylinder,

and

turn

the

key

clockwise

until

the

rubber

slipper

head

is

fully

retracted

and

locked

behind

the

limit

peg.

A.

13

Table of Contents

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MG MGB Specifications

General

Brand	MG
Model	MGB
Category	Automobile
Language	English

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