Westerbeke 4.0Kw BCDB 50Hz Installationshandbuch PDF herunterladen (Seite 35)

ENGINE

ADJUSTMENTS

NOTE:

WESTERBEKE

recommends

that

the

following engine adjust-

ments

performed by a competent engine

mechanic.

The

information

below

provided to assist

the

mechanic.

DRIVE

BELT

ADJUSTMENT

TORQUING

THE

CYLINDER

HEAD

BOLTS

For your safety, WESTERBEKE generator models come

equipped with belt guards that cover

over the belt(s) on the

front

the engine. ("Out

sight - out

mind."

The

belt

guard is

NOT

installed for that purpose.) Operators are

advised that proper inspection, service, and maintenance is

required.

Excessive drive belt tension can cause rapid wear

the belt

and reduce the service life

the fresh water pump's bearing.

A slack belt

the presence

oil

the belt can cause belt

slipping, resulting in high operating temperatures.

The

drive belt is properly adjusted

the belt can be

deflected no less than 3/8 inch

(10mm) and no more than 1/2

inch (12mm) as the belt is depressed with the thumb

the

midpoint between the two pulleys on the longest span

the

belt. A spare belt

belts should always be carried on board.

WARNING:

Never

attempt

check

adjust

the

drive

~elt's

tension

while

the

engine

operation.

Adjusting

Belt

Tension

1. Remove the belt guard.

2. Loosen the pivot belt that holds the idler sheave and

loosen the adjusting bolt.

3. With the belt loose, inspect for wear, cracks and frayed

edges.

4. Pivot the idler sheave to the left

right as required, to

loosen

tighten.

S. Tighten the pivot bolt and the adjusting bolt.

6. Replace the guard. Operate the generator for about 5 min-

utes and then shut the generator down.

7. Remove the guard and recheck the belt tension.

8. Replace the guard.

ADJUSTING

BOLT

After the initial break-in period (approximately 50 hours) and

every

500 hours thereafter, the cylinder head bolts should

re-torqued.

Tighten the cylinder head bolts according to the sequence

shown. Make sure the engine is cold when this is done.

Before applying the specified torque to the boIt, loosen

1/4

to 1/2

a turn and then apply the torque. Follow this pro-

cedure according to the numbered sequence shown

the

illustration to the right.

Bolts

#1,2,

and 3, (12mm socket) 2.0 - 3.0 kg-m

(14-

22 ft-Ib). Bolts #4, 5, 6, 7, 8, 9, 10, and

(14mm socket)

7.5

- 8.5 kg-m (54 -

ft-Ib) (Rockershaft Hold Down Bolts

-12mm

socket - 1.5 - 2.2 kg-mm

(11

-16

ft-lb).

rt)2

E)11

CYLINDER

HEAD

BOLT

PATTERN

ENGINE

COMPRESSION

Check the engine's compression pressure at 500 and 1250

operating hours

whenever engine performance is reduced.

Remove each glow plug and check each cylinder'S compres-

sion pressure. The engine's cranking speed is at

280

rpm_

Compression values:

Standard

397.6 psi (28

kglcm2)

Minimum

312.4 psi (22

kglcm2)

The maximum acceptable difference between cylinders is

35.5 psi (3.5

kglcm

Engines & Generators

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