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Westerbeke WPDS-20 Manual del operador Pagina 60

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VALVE CLEARANCE ADJUSTMENT
CAUTION
The cylinder head nuts must be retightened after the first 50-hours of break-in operation, and
before adjusting the
valves. Make sure the engine
is
cold when retightening the cylinder head
nuts. Refer
to
the "TORQUE SPECIFICATION" section
of
this manual for proper tightening
specifications, page
61.
If the engine needs
to
be timed, refer
to
the ''TIMING ADJUSTMENT" section in the Technical Manual. En-
gine timing should be performed
by
a competent diesel mechanic.
Follow the procedure described below when tightening cylinder head nuts and when adjusting
valves.
1.
Loosen the hose clamp on the air breather pipe and remove the hose clamp and the air breather from the
rocker cover. Remove the rocker cover
bolts and remove the rocker cover.
2.
Tighten the cylinder head nuts according
to
the sequence shown in the illustration shown below. Make
sure the engine is cold when this is done. Loosen one head nut
one-half turn and then tighten it to either
60 Ib-ft, 8.3 kg-m,
or
to
81
N-m. Then proceed to the next head nut in the sequence numbering shown.
3.
Torque the rocker shaft bracket securing nuts evenly between
12
to
15
Ib-ft
or
1.7
to
2 kg-m.
4.
Adjust the valve clearances according
to
the procedures described
in
steps A-D. Adjust all valve clearan-
ces
to
0.012 inches (0.30 mm) while the engine
is
cold.
A. While facing the front
of
the engine, turn the engine's crankshaft clockwise so that the
No
1 cylinder's
valves are in their
''Valve overlap" position; that
is,
the period between the opening of the inlet valve and
the
closing of the exhaust valve.
B.
In this pOSition, adjust the clearances
of
the
No.4
cylinder's valves. Turn the crankshaft as described
in step A so that the
valves
of
the
No.3
cylinder are in their overlap position, and then adjust the NO.2
cylinder's
valves.
C.
Turn the crankshaft again so that the valves
of
the
No.4
cylinder are in their overlap position, and ad-
just the
No.1
cylinder's valves.
D.
Turn the crankshaft so that the valves
of
the NO.2 cylinder are in their overlap position, and adjust the
No.3
cylinder's valves.
Westerbeke
Diesel
Engines
60
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