PROPELLER INSTALLATION INSTRUCTIONSIMPORTANT: This document guides our dealers, boatbuilders, and company service personnel in the proper installation orservice of our products. If you have not been trained in the recommended servicing or installation procedures for these or similar
Mercury Marine products, have the work performed by an authorized Mercury Marine dealer technician. Improper installation orservicing of the Mercury product could result in damage to the product or personal injury to those installing or operating theproduct.

NOTE: After completing installation, place these instructions with the product for the owner's future use.

Propeller Installation
Lubricate the Propeller Shaft! WARNING
Rotating propellers can cause serious injury or death. Never operate the boat out of the water with a propeller installed. Before
installing or removing a propeller, place the drive unit in neutral and engage the lanyard stop switch to prevent the engine fromstarting. Place a block of wood between the propeller blade and the anti‑ventilation plate.
To aid in future removal and corrosion resistance, apply one of the following lubricants to the propeller shaft before propeller
installation.

12733

Tube Ref No.

Description

Where UsedPart No.

94

Anti-Corrosion Grease

Propeller shaft splines

92-802867Q 1

95

2-4-C with Teflon

Propeller shaft splines

92-802859A 1

34

Special Lubricant 101

Propeller shaft splines

92-802865Q02

Flo‑Torq l Propellers
1.

Install the propeller onto the shaft with the supplied components. If the components supplied with the propeller are different
than what is shown, refer to the propeller installation instructions provided with your product or contact your dealer.

2.

Place the locknut retainer over the raised pins and tighten the locknut to the specified torque.

3.

Secure the locknut by bending the tabs up against the flats on the nut.

abc

d90-8M0050797 SEPTEMBER 2010eFlo-Torq l propellera - Forward thrust washerb - Propellerc - Locknut retainer
d - Locknut
e - Raised pins
f - Tabs bent against the locknut

f45294© 2010 Mercury Marine

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PROPELLER INSTALLATION INSTRUCTIONS
DescriptionNmlb‑in.

lb‑ft

6–15 hp locknut

11.3

100

18–25 hp locknut

22.6

16.7

30–60 hp locknut

74.655

Flo‑Torq ll Propellers
Flo-Torq ll Propellers Fastened with a Locknut
1.

Install the propeller onto the shaft with the supplied components. If the components supplied with the propeller are different
than what is shown, refer to the propeller installation instructions provided with your product or contact your dealer.

2.

Place the locknut retainer over the raised pins on the drive sleeve adapter and tighten the locknut to the specified torque.

3.

Secure the locknut by bending the tabs up against the flats on the nut.

acbdhgefab45232

dcehfgFlo-Torq ll propeller without a hub bushinga - Forward thrust washerb - Drive sleevec - Propeller
d - Drive sleeve adapter
e - Locknut retainer
f - Locknut
g - Raised pins
h - Tabs bent against the locknut

i45233

Flo-Torq ll propeller with a hub bushinga - Forward thrust washerb - Hub bushingc - Drive sleeved - Propeller
e - Drive sleeve adapter
f - Locknut retainer
g - Locknut
h - Raised pins
i - Tabs bent against the locknut

Description

Nmlb‑in.

lb‑ft

Locknut ‑ propellers without a hub bushing

7555

Locknut ‑ propellers with a hub bushing

136

100

Flo-Torq ll Propellers Fastened with a Castle Nut and Cotter Pin
1.

Install the propeller onto the shaft with the supplied components, as shown. If the components supplied with the propeller
are different than what is shown, refer to the propeller installation instructions provided with your product or contact yourdealer.

2.

Tighten the castle nut to the specified torque. Secure the castle nut to the shaft with a cotter pin.

abcdefg45234

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Flo-Torq ll propeller fastened with a castle nut
a - Forward thrust washerb - Drive sleevec - Propeller
d - Drive sleeve adapter
e - Washer
f - Castle nut
g - Cotter pin

90-8M0050797

SEPTEMBER 2010

PROPELLER INSTALLATION INSTRUCTIONS
Description

Nm

Castle nut

75

lb‑in.

lb‑ft
55

Flo‑Torq III and Flo‑Torq IV Propellers
NOTE: The Flo‑Torq lll and lV propellers are designed to have a small amount of free play when installed. This free play allows
the propeller to slide back and forth on the drive sleeve adapter (up to 3.17 mm [1/8 in.]) and rotate up to 10 degrees.

Flo-Torq lll and lV Propellers Fastened with a Locknut
1.

Install the propeller onto the shaft with the supplied components, as shown. If the components supplied with the propeller
are different than what is shown, refer to the propeller installation instructions provided with your product or contact yourdealer.

2.

Tighten the locknut to the specified torque.

3.

Secure the locknut by bending three of the tabs into the grooves in the drive sleeve adapter.

cabd45246

Flo-Torq lll fastened with a locknuta - Forward thrust washerb - Drive sleevec - Propeller
d - Drive sleeve adapter
e - Locknut retainer
f - Locknut
g - Tabs bent into grooves

45248

Flo-Torq lV fastened with a locknut
a - Forward thrust washerb - Drive sleevec - Propeller
d - Drive sleeve adapter
e - Locknut retainer
f - Locknut
g - Tabs bent into grooves

gefcabdgefDescription

NmLocknut

75

lb‑in.

lb‑ft
55

Flo-Torq lll Propellers Fastened with a Castle Nut and Cotter Pin1.

Install the propeller onto the shaft with the supplied components, as shown. If the components supplied with the propeller
are different than what is shown, refer to the propeller installation instructions provided with your product or contact yourdealer.

2.

Tighten the castle nut to the specified torque. Secure the castle nut to the shaft with a cotter pin.

cabde
fg45247

Flo-Torq lll propeller fastened with a castle nut
a - Forward thrust washerb - Drive sleevec - Propeller
d - Drive sleeve adapter
e - Washer
f - Castle nutg - Cotter pin

Description

NmCastle nut

75

90-8M0050797 SEPTEMBER 2010

lb‑in.

lb‑ft
55

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PROPELLER INSTALLATION INSTRUCTIONS

Flo‑Torq Reflex Drive Hub Installation
Drive Sleeve Alignment
Alignment Method 1
1.

Align the identification number on the aft drive sleeve with the rectangular mark on the front drive sleeve.

2.

Insert the aft drive sleeve into the front drive sleeve.
a - Rectangular mark on the front drive sleeveb - Identification number on the aft drive sleeve (1 or 2)

ab2

44661

Alignment Method 2
1.

Align the fingers of the aft sleeve with the pockets of the front sleeve, as shown.

2.

Insert the aft drive sleeve into the front drive sleeve.

a2bab44697

a - Wide spacer on front drive sleeveb - Wide gap between fingers on the aft drive sleeve

Installing the Drive Sleeve into the Propeller
1.

Ensure there is no gap between the drive sleeve and the aft drive sleeve.

44714

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PROPELLER INSTALLATION INSTRUCTIONS
2.

Insert the drive sleeve assembly onto the propeller and push the drive sleeve assembly onto the propeller.

44720

3.

Install the aft washer onto the drive sleeve assembly and lightly tap the drive sleeve assembly into the propeller. The aftwasher will contact the propeller when the drive sleeve assembly is properly seated.
a - Aft washer

a44725IMPORTANT: The Flo‑Torq Reflex drive hub requires the use of the thrust washer that is included with the drive hub kit.

Mercury Outboard Application
1.

Install the forward thrust washer onto the propeller shaft.

43671

2.
3.
4.

Install the propeller onto the shaft with the supplied components, as shown. If the components supplied with the propeller
are different than what is shown, refer to the propeller installation instructions provided with your product or contact yourdealer.
Place the locknut retainer over the raised pins on the drive sleeve adapter and tighten the locknut to the specified torque.
Secure the locknut by bending the tabs up against the flats on the nut.

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PROPELLER INSTALLATION INSTRUCTIONSIMPORTANT: The Flo‑Torq Reflex drive hub requires the use of the propeller nut included with the drive hub kit. The useof a propeller nut that was not included with the Flo‑Torq Reflex drive hub kit will result with the nylon portion of the locknut
not fully engaging the propeller shaft threads.

bcadf

g

abcdefg-e

Forward thrust washer
Propeller
Drive sleeve adapter
Locknut retainer
Locknut
Raised pins
Tabs bent against the locknut

45424

5.

Rotate the propeller to verify interference or binding does not exist between the gear housing and the propeller.
DescriptionNmNut

75

lb‑in.

lb‑ft
55

NOTE: A small amount of rotation play and forward aft play is normal.

Honda and Yamaha Outboard Application
1.

Install the correct front thrust washer onto the propeller shaft.

aba - Yamaha applicationb - Honda application

43672

2.
3.

4.
5.

Install the propeller onto the shaft with the components, as shown. Use the existing castle nut provided with the outboard.
If the components supplied with the propeller are different than what is shown, refer to the propeller installation instructions
provided with your product or contact your dealer.
Place the castle nut retainer over the raised pins on the drive sleeve adapter and tighten the castle nut to the specified
torque.

NOTE: A cotter pin is not required to secure the castle nut. Bending the castle nut retainer tabs against the castle nut willsecure the nut.
Secure the castle nut by bending the tabs on the castle nut retainer up against the flats on the nut.
Rotate the propeller to verify interference or binding does not exist between the gear housing and the propeller.
NOTE: A small amount of rotation play and forward aft play is normal.

bacdfge45429Honda outboard applicationa - Forward thrust washerb - Propellerc - Drive sleeve adapter
d - Castle nut retainere - Castle nut ‑ provided with outboard
f - Raised pins
g - Tabs bent against the nutDescription

Nm

Castle nut

75

Page 6 / 9

90-8M0050797

lb‑in.

lb‑ft
55

SEPTEMBER 2010

PROPELLER INSTALLATION INSTRUCTIONS

bcagfdYamaha outboard applicationa - Forward thrust washerb - Propellerc - Drive sleeve adapter
d - Castle nut retainere - Castle nut ‑ provided with outboard
f - Raised pins
g - Tabs bent against the nut

e45430Description

Nm

Castle nut

75

lb‑in.

lb‑ft
55

Bravo Three Propeller Installation

IMPORTANT: Mercury Marine Bravo Three propellers are matched sets. Do not operate the drive without a front and rearpropeller of the same pitch.
1.

Apply a liberal amount of one of the following lubricants to the inner and outer propeller shafts.

2.

Slide the forward thrust hub onto the outer propeller shaft with the tapered end of the hub facing aft.

3.

Align the splines of the propeller with the splines on the shaft and slide the propeller into place on the outer shaft.

4.

Secure it with the forward propeller nut and tighten to the specified torque.

5.

Slide the aft thrust hub onto the inner propeller shaft with the tapered end of the hub facing aft.

6.

Align the splines of the propeller with the splines on the shaft and slide the propeller into place on the inner shaft.

7.

Secure it with the aft propeller nut and tighten to the specified torque.
a - Outer propeller shaft
b - Inner propeller shaft
c - Forward thrust hub
d - Forward propeller
e - Forward propeller nutf - Aft thrust hub
g - Aft propeller
h - Aft propeller nut
i - Anodej - Washers
k - Screw

gabhcdiejkf43655

Tube Ref No.

Description

Where UsedPart No.

34

Special Lubricant 101

Propeller shaft splines

92-802865Q02

94

Anti-Corrosion Grease

Propeller shaft splines

92-802867Q 1

95

2-4-C with Teflon

Propeller shaft splines

92-802859A 1

Description

Nm

Forward propeller nut

136

100

Aft propeller nut

8160

90-8M0050797 SEPTEMBER 2010

lb‑in.

lb‑ft

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PROPELLER INSTALLATION INSTRUCTIONS
Description

Nm

Anode screw

27

lb‑in.

lb‑ft20

IMPORTANT: Check the tightness of both propellers after 20 hours of operation. Tighten the propeller nuts if necessary.
Do not operate the vessel with a loose propeller.

Propeller Inspection and Maintenance•••Inspect the leading edge of the propeller frequently for nicks, gouges, and damage.
Propellers with large, deep dents, gouges, or torn metal should be replaced or repaired.
Mineral deposits on stainless steel propellers can be caused by an inoperative or missing MerCathode system.

NOTE: Mineral deposits can be removed with household cleaners such as vinegar or other cleaners that remove lime andmineral deposits.

aa - Leading edgeb - Fatigue crack
c - Cupcb6403

Propeller Basics
Consult the engine's Owners, Operation and Maintenance Manual for the recommended wide‑open throttle (WOT) operating
range of the engine.
Select a propeller that allows the engine to operate within the WOT RPM operating range.
IMPORTANT: Always perform WOT RPM tests with the boat in its normal configuration; i.e. fuel load, passenger load, equipmentload, skiers, etc.
Use the following information to help select the proper propeller for the vessel:•Adding 25 mm (1 in.) of propeller pitch will reduce the WOT RPM by 150 to 200 RPM.
•
Subtracting 25 mm (1 in.) of propeller pitch will increase the WOT RPM by 150 to 200 RPM.
•Switching from a three blade to a four blade propeller with the same pitch generally reduces WOT RPM by 50 to 100 RPM.

Performance Vent System
The performance vent system (PVS) was created to help our customers optimize Mercury propellers on their personal boat andunique boating conditions. PVS allows the boater to custom tune the venting of the propeller blades to dial in the perfectacceleration and cruising performance.
On acceleration, exhaust is drawn out of the vent hole located behind each propeller blade. When the next propeller blade strikes
this aerated water, less force is required to push through the aerated water versus solid water. This allows the engine RPM torise more rapidly. Once on plane speed is reached, water flowing over the vent holes seal the exhaust gas in the hub, allowing
the propeller to again operate in solid nonaerated water. By varying the size of the exhaust vent hole, the rate at which the engine
RPM rises can now be controlled.
Laser II, Trophy Plus, and Tempest Plus propellers are shipped with medium PVS vent plugs; and Mirage Plus, Offshore,
Revolution 4, and HighFive propellers are shipped with solid PVS vent plugs offering all‑around performance for most boating
situations.

Acceleration Problem/Solution
1.
2.

Slow/sluggish acceleration to plane (engine unable to push solid water away quickly).
•Solution: Increase ventilation by using a plug with larger holes.
Over ventilation ‑ the load on the propeller is significantly reduced by the mixing of exhaust into the water stream causing
an engine overrevving condition before the vessel is on plane.

Page 8 / 990-8M0050797

SEPTEMBER 2010

PROPELLER INSTALLATION INSTRUCTIONS•Solution: Decrease ventilation by using a plug with a smaller hole or use a solid plug.

abcd13391

a - Solid plugb - Large ‑ 12 mm (0.470 in.)c - Medium ‑ 9 mm (0.350 in.)d - Small ‑ 7 mm (0.280 in.)

Products of Mercury Marine
W6250 Pioneer Road
Fond du Lac, WI 54936-1939

90-8M0050797 SEPTEMBER 2010Mercury, Mercury Marine, MerCruiser, Mercury MerCruiser, Mercury Racing, Mercury Precision Parts, MercuryPropellers, Mariner, Quicksilver, Alpha, Axius, Bravo One, Bravo Two, Bravo Three, K-Planes, MerCathode, OptiMax,
Precision Pilot, Pro Max, SeaCore, Skyhook, SmartCraft, Sport-Jet, Total Command, Verado, VesselView, Zero
Effort, Zeus, #1 On The Water, M with Waves logo, Mercury with Waves logo, and SmartCraft logo are all registeredtrademarks of Brunswick Corporation. Mercury Product Protection logo is a registered service mark of Brunswick
Corporation.

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