Prop.slip; Engine.cooling.systems; Raw.water.cooling.-.Stern.drives.&.Inboards - Four winns 348 vista Owner's Manual

C. Prop Slip
When.traveling.through.water.a.propeller.is.unable..
to get a complete bite because of the fluidity of water.
"Prop slip" is usually expressed as a percent of the
computed theoretical speed. Twenty-five to thirty-five
percent.prop.slip.is.common.for.a.cruiser-type.boat.
operating.at.cruising.speed.
Changing.either.diameter.or.pitch.will.have.an.effect.
on.engine.speed.and.prop.slip,.and.in.turn,.directly.
effect.the.performance.of.a.boat..The.propellers.
included.with.each.Four.Winns
general.performance.based.on.data.obtained.from.
on-the-water.testing.of.that.model..Variations.in.load,.
operating.conditions,.environment,.the.individual.
engine.and.hull.performance.may.necessitate.the.
purchase.and.use.of.another.propeller(s).
.
Under.your.normal.load.conditions,.the.engines.
should.turn.within.the.maximum.RPM.range.when.at.
full.throttle..If.the.engines.exceed.the.recommended.
RPM,.an.increase.in.pitch.or.diameter.is.required...
If.the.engine.RPM.is.too.low,.a.decrease.in.pitch.or.
diameter.is.required.
The.load.carried.in.a.boat.will.directly.affect.perfor-
mance.of.the.engine..If.an.engine.that.is.not.develop-
ing.full.power,.be.sure.the.engine.is.properly.tuned.
and.load.conditions.are.those.normally.experienced,.
before.changing.propellers.
NOTICE
For twin engine installations, always check
drive shaft rotation before propeller installation.
A right hand rotation propeller must be
installed on the starboard propeller shaft.
Similarly, a left hand prop must be installed
on the port propeller shaft.
For.shipping.reasons,.the.propellers.are.not.factory..
installed..Initial.installation.of.the.propellers.will.be..
performed.by.the.dealer.during.pre-delivery.service..
See.Figure.E-6.
Engines, Drives and Instrumentation - Section E
.boat.provide.the.best.
®
Figure E-6: Prop Installation
NOTICE
Should it be necessary to change propellers,
always use an appropriate propeller removal
tool or "Prop Puller." DO NOT attempt removal
using a hammer. Damage to the propeller or
propeller shaft can result.
Always.check.shaft.rotation.before.propeller.installa-
tion..A.right.hand.rotation.propeller.must.be.installed.
on.the.prop.shaft.connected.to.a.starboard.engine..
Similarly,.a.left.hand.prop.must.be.connected.to.the.
port.engine.shaft..The.propellers.must.rotate.outboard.
not.inboard.
Be.sure.the.propellers.are.of.the.correct.blade..
configuration, diameter, pitch, and shaft size to assure
good.performance..For.additional.information.on..
factors.affecting.performance.and/or.assistance.with.
your.selection,.please.consult.your.Four.Winns.dealer..
E - 6 ENGINE COOLING SYSTEMS
A. Raw Water Cooling - Stern Drives & Inboards
Certain.stern.drive.and.inboard.engines.utilize.a.raw.
water.cooling.system..This.cooling.system.is.a.
seawater.system..Seawater.(raw).water.is.taken.in.
through.water.inlets.on.the.both.sides.of.the.lower.
gear.unit.of.the.stern.drives.models.or.by.thru-hull.
intake.scoops.with.strainers.(inboards)..Water.
pumped.to.the.engine.by.the.seawater.pump.is.
circulated.through.the.engine.by.the.engine.circulating.
pump..A.thermostat.controls.the.engine.operating.
temperature.by.determining.the.amount.of.water.to.be.
taken.in,.recirculated.and.discharged..On.stern.drive.
models,.the.water.is.discharged.through.an.idle.
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