General - Westerbeke ATOMIC 4 Operation And Maintenance Manual

in ratios varying from
J..j,.12:1.
Reduction gears
with
various model engines
in l'able 1.
a. Helical Reduction Gears
1.5:1 to
supplied
are shown
(I)
The reduct ion gear unit cons ists
of a helical drive pinion mounted
on the reverse gear tailshaft sup-
ported in the reduction gear front
cover and an internal helical gear
rigidly supported on large capacity
ball bearings in the reduction gear
housing. The reduction gear ratio
is determined by the number of teeth
in pInIon and internal gears. The
centerline offset is the difference
in pitch radii of the pinion and
the internal gears. The pinion gear
is keyed to the reverse gear tail-
shaft and held in place by a nut.
It is supported in a large ball
bearing in the adaptor plate and
reverse gear housing. Correct
alignment of the pinion gear is
maintained by this ball bearing and
the one on the engine sleeve gear
at the forward end of the tai lshaft.
(2)
The internal helical gear is
bolted to a flanged reduction gear
shaft rigidly mounted on two large
ball bearings. The one next to the
gear and carrying most of the ra-
dial load is a single row unit.
The propeller thrust bearing is a
double row unit capable of taking
the heavy axial propeller thrust
in addition to the radial load ic-
posed by the helical gear.
(3)
The propelter shaft coupling is
keyed to the end of the reduction
gear shaft and held in place by a
lock nut. The propeller shaft coup-
ling
iR
supported by the large
double ron ball bearing.
(4)
A ring type oil seal pressed
into the propeller thrust bearing
retainer rubs on the polished sur-
face of the propeller thrust coup-
ling. This prevents loss of reduc-
tion gear oil from the housing and
the entrance of water or dirt into
the reduction gear.
(5)
On some models the reduction
gear is oiled
by
crankcase pressure
and on others separate lubrication
is provided. See Table
4.
b. Universal l-{eduction Drive
The Universul reduction drive con-
sists of two herringbone gears, a
small gear press fit on the reverse
gear tailsbaft, and a larger gear
which floats
OD
the spline shaft
below it. Both the drive shaft and
the lower spline shaft are supported
by heavy duty ball bear ings. Running
in a continuous bath of oil, this
type of drive is positive, quiet,
and smooth.
SECTION V
PERIODIC SERVICE
1. GENERAL
Periodic maintenance procedures
will do much to keep your engine
operating at top efficiency. Regu-
lar inspection of the engine fol-
lowing the proce&lres listed in
Paragraph 2 through 8 will reduce
~aintenanc0 costs Rnd uphold the
high standar(lR of quietness, reI ia-
bility, und performance built into
-43-
every UNIVERSAL engine.
2. PHE-OPERATIONAL CHECK
a. Check" engine oil level. If neces-
sary, Add oil to bring it up to the
full mark on the bayonet stick.
Sec TobIe h for proper ~eight oil.