Installation manual

ManualsBrandsWesterbeke ManualsAutomotive108B

ENGINE

ADJUSTMENTS

NOTE:

The

following engine

adjustments

sTwuld

be

peiformed by a

competent engine

mecTwnic.

The

information below

is

provided

to

assist

the

mechanic.

VALVE

CLEARANCE

ADJUSTMENT

The

valve

clearance

must

be

adjusted every

500

operating

hours

or whenever

the

valve

rocker

is

abnormally

noisy.

Valve

adjustment should

only

be

done

when engine is

cold.

. Cold

engine

valve

clearance

is

0.015in

(0.40mm).

VALVE

CLEARANCE

NOTE:

The

Cylinder

heGd

bolts have been tightened with the '

"Angular

TIghtening

MetTwd".

Therefore,

it

is

not necessary

to

retighten

the

cylinder head bolts before adjusting

the

valve '

clearances.

ADJUSTMENT

PROCEDURE

f

CRANK

PULLEY

. - -

-';

~

-

"."\

1.

Tum

the

crankshaft clockwise

so

that

the

mark groove on '

the crank pulley

is

aligned with the TDC mark (cast out)

on

the

timing gear case cover. i

2. Remove

the

cylinder head cover

and

check

to

see

if

cylin-

der

No.1

is at

IDC

in

the

compression stroke or at

IDC

in the exhaust stroke. When

the

intake

imd

exhaust valves

are closed,

the

cylinder

is

at

IDC

in

the compression

stroke,

and

when

only

the

exhaust valve is open, it

is

at

IDC

in the exhaust stroke.

CYLINDER

NO.1

COMPRESSION·

-

7\

.

~l-J--

. G

...

_~

....._"'57\ ;

CYLINDER

NO.1,

r

---'

\

",,--,

EXHAUST

,

3. In accordance with

tlJe

ccmditions

of

cylinder No.1, mea-

sure

and

adjust

if

required

the

clearance of the valves

marked

with either@

or.

in

the

table

below.

Cylinder

No.

1 2 3

4

Valve ,arra.ngemant

I E I E I

E

I

E

When

No.1

cylinder is at

TDC

•

•

•

•

'

in

the compression stroke

When

No.4

cylinder is at

TOC

in

the cotnpression stroke

I1il

©

© ©

I:

Inlet E .. Exhaust

4.

On completion of the valve clearance alignment make a

mark alignment

as

in 1

by

giving a turn

to

the crankshaft

in

the

normal direction.

Then

measure

and

adjust

the

clearance of the other

valves.

A

CAUTION:

The

rocker

arm

is

made

of

die-cast

aluminum.

Therefore,

be

careful

not

to

tighten

the

adjusting

screw

to

excess.

Adjustment

of

Injection

Timing

The

injection timing

may

not

be

re-adjusted. Take care not

to

forget

to

insert a shim

in

the

mounting surface when

reassembling

the

injection pump after disassembly.

IDLE

SPEED

(OPERATING

RPMS)

Engine idles speed

950 -

1000

rpm

(All

models

in

this

manual)

Idle speed

should

be

adjusted

with

the engine in

its

normal

operating temperature

range.

Cruise RPM

Models

55BIFour

and

55CIFour

Model 55DIFour

2000-2500

rpm

2000-2400

rpm

Maximnm RPM (propeller loaded)

Models

55BIFour

and

55C/Four 2950-3000

rpm

Model 55DIFour 2550-2600

rpm

~

WESTERBEKE

Engines & Genera/ors

37