Westerbeke 108B Manual de instalación descargar pdf (Pagina 31)

ENGINE

ADJUSTMENTS

NOTE:

WESTERBEKE

recommends

that

the

following

engine

adjust·

ments

peifonned by a competent

engine

mechanic.

The

infonnation

below

provided

assist

the

mechanic.

CHECKING

VALVE

CLEARANCE

Valve

clearance

must

checked

and adjusted

when

engine

is cold

1. Remove the head cover.

Align the

ITC

mark line on the flywheel and projection

on the housing so that the No.1 piston comes to the

compression or overlap top dead center.

3. Check the following valve clearance (1) marked with

-!:<

using a feeler gauge.

the clearance

not within the factory specification,

adjust with the adjusting screw.

VALVE

CLEARANCE

0.23·

0.27mm

(0.0091

·0.0106in)

The

marking line on the flywheel is

just

for the

No.1

There is

marking for the other cylinders. The No.1

piston comes to the top dead center position when the

marking is aligned with the projection in the window on

the flywheel-housing. Tum the flywheel

0.26 radius (15')

clockwise and counterclockwise to see

the piston is at

the compression top dead center

the overlap position.

Now, referring to the table below, readjust the valve

clearance.

The

piston is at the top dead center when both

the

IN.

and EX. valves do not move.

is at the overlap

position when both the valves move.

Finally, tum the flywheel 6.28 radius

(360') and align the

marking and the projection perfectly. Adjust all the other

valve clearances

required.

After turning the flywheel counterclockwise twice

three

times, recheck the valve clearance.

After adjusting the valve clearance, finnly tighten the locknut

the adjusting screw.

Adjustable

Valve, arrangement

I-

cylinder

4CYL.

location

piston

IN.

EX;

No.1

When No.1 pistop is

No.2

compression top dead

center

No.3

, ,

No.4

No.1

When

No.1 piston is

No.2

overlap position

No.3

PROJECTION

ITG

MARK

ADJUSTING

SCREWS,

LOCKNUT

TIMING

WINDOW

\ \

FLYWHEEL

jHOUSING

No.4

r-:"'''''''''''~IIiI~

VALVE

CLEARANCE

0.23·

0.27mm

(0.0091

·0.010610)

~'a,

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Westerbeke 108B Manual de instalación Pagina 31

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