Westerbeke W-70GA Manual de instalación descargar pdf (Pagina 37)

ENGINE

ADJUSTMENTS

NOTE:

WESTERBEKE recommends that the following engine adjust-

ments be performed by a competent engine mechanic. The information

below is provided

assist the mechanic.

TORQUING

THE

CYLINDER

HEAD

BOLTS

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

cylinder head bolts should be re-torqued.

Tighten the cylinder head bolts according to the sequence

shown. Make sure the engine

cold when this

done, and

loosen one head bolt one-half turn and then tighten it

between 55 - 59 lb-ft (8.2 - 8.8 Kg-rn). Then proceed to the

next head bolt in the sequence. Tighten the RS (rocker cover

stud) securely.

7 3

HIGH

TENSION

CORDS

(IGNITION

WIRES)

Check the ignition wires every 500 operating hours as engine

compartment heat can deteriorate the wires.

Check the resistance

each wire. Do not pull on the wire

because the wire connection inside the cap may become

separated or the insulator may be damaged. When removing

the wires from the spark plugs, grasp and twist the molded

cap, then pull the cap off the spark plug.

THE

RESISTANCE

VALUE

410

OHM

PER

INCH.

TESTING

RESISTANCE

ENGINE

COMPRESSION

it becomes necessary to check the engines cylinder

compression, warm the engine and shut it down.

Remove the spark plugs and install a compression adapter

(screws into a plug hole) with a gauge.

Crank the engine (close off the raw water) and unplug the

ignition coil. Allow the compression gauge to reach a

maximum reading and record.

Measure the compression pressure for each cylinder. Ensure

that the pressure differential for each cylinder is within the

specifications.

COMPRESSION

PRESSURE

1400

RPM

LIMIT

DIFFERENCE

BETWEEN

CYLINDERS

198.1

psi

(14

kg/em')

28.0

psi

(2.0

kg/em')

a cylinder's compression or pressure differential

below

the limit, add a small

an10unt

engine oil through the spark

plug hole and repeat the test.

the oil causes

increase

pressure, the piston ring andlor cylinder wall may be worn or

damaged.

the added oil does not increase compression

pressure suspect poor valve contact, valve seizure, or valve

wear. Reinstall the plugs, ignition wires, and coil.

Open

the

raw

water

tbru

seacock.

Engines & Generators

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Westerbeke W-70GA Manual de instalación Pagina 37

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