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Author Topic:   Mecury Propeller FLO-TORQ II Hubs

Swellmonster posted 11-24-2005 02:48 AM ET (US)
What is the difference between the one piece and two piece FLO-TORQ II hubs for the Mercury outboard motors?
Peter posted 11-24-2005 07:09 AM ET (US)
That's easy, one piece. ;) Seriously, I think Mercury simply calls its conventional rubber hub a Flo-torq hub. The Flo-Torq II hub is the hub set that uses the breakaway plastic sleeve. For more info, see mercurymarine.com/flo-torq . By the way, unlike propellers with the Flo-Torq hub, propellers that use the Flo-Torq II system can be used on virtually any brand of outboard motor with the right adapter kits.
Tom W Clark posted 11-24-2005 10:46 AM ET (US)
Pat,
I do not understand your question. Most Flo-Torq hub kits include six or seven parts.
Thrust Washer
Bushing*
Delrin Drive Sleeve
Aft Adapter
Spacer/Washer
Nut
Cotter Pin
*used with certain propellers like the Rev 4 and Trophy Plus.
You can see the breakdown of parts by navigating to the Flo-Torq Application Chart(s):
http://www.mercurypartsexpress.com/PartsExpress/HomePage/homepage.asp
jimh posted 11-24-2005 10:03 PM ET (US)
For me there is some confusion in these model names, FLO-TORQ and FLO-TORQ II.
I understand the current version (FLO-TORQ II) has interchangeable components. Was the prior version also a universal type hub which could be adapted to various propeller shafts? Or is the FLO-TORQ II system the initial version of the propellers which can be made universal through the use of interchangeable hub components?
bsmotril posted 11-24-2005 11:38 PM ET (US)
The original flo torques only fit Merc Motors. Flo Torque II came out about the same time as the Optimax motors. The old design flo torque hubs had a habit of letting go and slipping on big motors because the hotter exhaust of the lean running Optis toasted the rubber inside the hub. The modular hub on the new design also made it practical for Merc props to now fit other motors and opened up more market for Merc accessories. BillS
Backfire posted 11-25-2005 08:13 PM ET (US)
Lets try this explanation. The original plastic drive sleeve is one piece. Then in an effort to better stabilize the Trophy and Tempest stainless props on large engines Merc added a rear filler piece that wedges in the tapered end of the drive sleeve. Then in an on going effort to reduce "prop rattle", mostly on midrange engines, (sounds like a tooth is missing on one of the gears) they have come with a 2-PIECE drive sleeve and a longer aft adapter. All of this does not overcome the real problem that when you have a drive sleeve failure, you loose All ability to move at all. The rubber hubs will offer the ability to get home at reduced (fast idle) speed if that is the only option. There is a new product out to provide a emergency fix to a spun hub, but I have not seen one yet. I would carry a spare or two, drive sleeves, 'cause it is not that unusual to see failures.
Backfire
jimh posted 11-26-2005 10:36 AM ET (US)
This is getting more confusing!
It seems there are more versions of the FLO-TORQ hubs than initially thought. By my observation:
--FLO-TORQ
--FLO-TORQ II
--FLO-TORQ II with bushing
--FLO-TORQ II HD SOLID hub
--FLO-TORQ III
--FLO-TORQ HD
See:
http://www.mercurypartsexpress.com/
jimh posted 11-26-2005 10:45 AM ET (US)
Apparently there is a new plastic insert available for certain applications which is designed to reduce "prop rattle." See:
Two-piece plastic insert
jimh posted 11-26-2005 10:47 AM ET (US)
It also appears that there is a new insert available for very high power applications (more than 400-HP). This insert looks like it combines plastic and rubber.
HD Plastic Insert
jimh posted 11-26-2005 12:49 PM ET (US)
I had to tweak those hyperlinks to allow them to work after my session expired. You will have to select a dealer location before you can see them.
Peter posted 11-26-2005 05:24 PM ET (US)
The high power application sleeve is metal.
jimh posted 11-26-2005 07:23 PM ET (US)
Yes, metal--steel actually, according to the caption I missed before.
And expensive. The one for the SportMaster gear case is $150!
Swellmonster posted 12-03-2005 02:37 AM ET (US)
The propeller on my 225-HP motor came with a one-piece hard plastic replacable hub, and now I put in a two-piece, lightly linked or fused together hub. The two-piece is quieter; both fit the same prop. Still confused.
Other brand propellerss have the steel-rubber combo. When it slips, it is gone. Non-replaceable on the water. A field-replaceable rubber quiet sleave seems interesting. And this will continue to make me ponder.

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Author	Topic: Mecury Propeller FLO-TORQ II Hubs
Swellmonster	posted 11-24-2005 02:48 AM ET (US) What is the difference between the one piece and two piece FLO-TORQ II hubs for the Mercury outboard motors?
Peter	posted 11-24-2005 07:09 AM ET (US) That's easy, one piece. ;) Seriously, I think Mercury simply calls its conventional rubber hub a Flo-torq hub. The Flo-Torq II hub is the hub set that uses the breakaway plastic sleeve. For more info, see mercurymarine.com/flo-torq . By the way, unlike propellers with the Flo-Torq hub, propellers that use the Flo-Torq II system can be used on virtually any brand of outboard motor with the right adapter kits.
Tom W Clark	posted 11-24-2005 10:46 AM ET (US) Pat, I do not understand your question. Most Flo-Torq hub kits include six or seven parts. Thrust Washer Bushing* Delrin Drive Sleeve Aft Adapter Spacer/Washer Nut Cotter Pin *used with certain propellers like the Rev 4 and Trophy Plus. You can see the breakdown of parts by navigating to the Flo-Torq Application Chart(s): http://www.mercurypartsexpress.com/PartsExpress/HomePage/homepage.asp
jimh	posted 11-24-2005 10:03 PM ET (US) For me there is some confusion in these model names, FLO-TORQ and FLO-TORQ II. I understand the current version (FLO-TORQ II) has interchangeable components. Was the prior version also a universal type hub which could be adapted to various propeller shafts? Or is the FLO-TORQ II system the initial version of the propellers which can be made universal through the use of interchangeable hub components?
bsmotril	posted 11-24-2005 11:38 PM ET (US) The original flo torques only fit Merc Motors. Flo Torque II came out about the same time as the Optimax motors. The old design flo torque hubs had a habit of letting go and slipping on big motors because the hotter exhaust of the lean running Optis toasted the rubber inside the hub. The modular hub on the new design also made it practical for Merc props to now fit other motors and opened up more market for Merc accessories. BillS
Backfire	posted 11-25-2005 08:13 PM ET (US) Lets try this explanation. The original plastic drive sleeve is one piece. Then in an effort to better stabilize the Trophy and Tempest stainless props on large engines Merc added a rear filler piece that wedges in the tapered end of the drive sleeve. Then in an on going effort to reduce "prop rattle", mostly on midrange engines, (sounds like a tooth is missing on one of the gears) they have come with a 2-PIECE drive sleeve and a longer aft adapter. All of this does not overcome the real problem that when you have a drive sleeve failure, you loose All ability to move at all. The rubber hubs will offer the ability to get home at reduced (fast idle) speed if that is the only option. There is a new product out to provide a emergency fix to a spun hub, but I have not seen one yet. I would carry a spare or two, drive sleeves, 'cause it is not that unusual to see failures. Backfire
jimh	posted 11-26-2005 10:36 AM ET (US) This is getting more confusing! It seems there are more versions of the FLO-TORQ hubs than initially thought. By my observation: --FLO-TORQ --FLO-TORQ II --FLO-TORQ II with bushing --FLO-TORQ II HD SOLID hub --FLO-TORQ III --FLO-TORQ HD See: http://www.mercurypartsexpress.com/
jimh	posted 11-26-2005 10:45 AM ET (US) Apparently there is a new plastic insert available for certain applications which is designed to reduce "prop rattle." See: Two-piece plastic insert
jimh	posted 11-26-2005 10:47 AM ET (US) It also appears that there is a new insert available for very high power applications (more than 400-HP). This insert looks like it combines plastic and rubber. HD Plastic Insert
jimh	posted 11-26-2005 12:49 PM ET (US) I had to tweak those hyperlinks to allow them to work after my session expired. You will have to select a dealer location before you can see them.
Peter	posted 11-26-2005 05:24 PM ET (US) The high power application sleeve is metal.
jimh	posted 11-26-2005 07:23 PM ET (US) Yes, metal--steel actually, according to the caption I missed before. And expensive. The one for the SportMaster gear case is $150!
Swellmonster	posted 12-03-2005 02:37 AM ET (US) The propeller on my 225-HP motor came with a one-piece hard plastic replacable hub, and now I put in a two-piece, lightly linked or fused together hub. The two-piece is quieter; both fit the same prop. Still confused. Other brand propellerss have the steel-rubber combo. When it slips, it is gone. Non-replaceable on the water. A field-replaceable rubber quiet sleave seems interesting. And this will continue to make me ponder.