Westerbeke ATOMIC 4 User Manual

covered by these instructions are
supplied with Zenith marine type
safety non-drip carburetors, ex-
cept the V-8 models (See special
V-8 instruction books.) With the
exception of the following ad-
justments, maintenance of the car-
buretor by the operator is not
recommended. If difficulties arise
which are not correctable by the
following adjustments, it is recom-
mended that the carburetor be
sent to the UNIVERSAL factory for
repair or replacement.
a. Adjustment of Throttle Stop
Screw, Idle Needle Valve and
:Main Jet
(1) Before any of the above ad-
justments to the carburetor are
made, the engine should be opera-
ted for a sufficient length of
time to reach operating tempera-
ture.
(2) With throttle in idling posi-
tion, adjust the throttle stop
screw for desired idling speed.
See Fig. 65 and 66.
(3) Turn the idle needle valve
in and out until the speed of
the engine is steady and as fast
as this throttle position will
permit.
(4) Readjust the
screw for desired
speed.
throttle stop
engine idling
(5) Open the throttle approximately
one-third.
(6) Loosen the packing nut on the
main jet adjustment.
(7) Turn the main jet adjustment
screw in until the engine speed is
noticeably reduced.
(8) Turn the main jet adjustment
screw out until the engine runs
smoothly and as fast as this throt-
tle position will permit.
-51-
(9) Hold the adjusting screw in
place and tighten the packing nut.
(10) Return the throttle to idle
position and readjust idle needle
valve slightly for best idling
performance.
b. Carburetor
The carburetors used on six cyl-
inder gasoline marine engines are
the Zenith updraft type with both
idling and high-speed adjustments.
Each has a large air entrance whose
bowl
shaped bottom acts as a drip
collector with automatic drain.
A properly adjusted
should be left alone.
carburetor
If the fuel is free from dirt or
other impurities, the carburetor
should not clog up or give trouble.
We recommend that a large size
fuel strainer be inserted in the
gasoline line between the fuel
pump and carburetor to trap dirt
and condensation.
Since a marine engine operates
under more or less steady load
conditions, it is comparatively
easy to- adjust the carburetor. To
facilitate adjustment of the car-
buretor it is fitted with an id-
ling jet "A", high speed jet "Btl,
choke "C" and idling adjustment
screw "D" as shown in Fig. 68.
When adjusting your carburetor, be
sure that the flame arrestor is
clean and free of obstructions,
and that the choke "C" is wide open.
1;'arm the engine up thoroughly be-
fore attempting the adjustment.
With the engine idling turn the id-
ling jet "A" slowly to the right
and left until the setting is found
that will let the engine idle
smoothly and as fast as that throt-
tle setting will permit. Adjust the
idling adjustment screw "D" to the

Westerbeke ATOMIC 4 Specifications

General

Brand	Westerbeke
Model	ATOMIC 4
Category	Engine
Language	English