Forum: WHALER
  ContinuousWave
  Whaler
  Moderated Discussion Areas
  ContinuousWave: Whaler Performance
  Flo-Torq Adapters

Post New Topic  Post Reply
search | FAQ | profile | register | author help

Author Topic:   Flo-Torq Adapters
jimh posted 02-09-2007 08:55 AM ET (US)   Profile for jimh   Send Email to jimh  
There has been much discussion about the new Mercury Flo-Torq III and Flo-Torq IV adapters. Tom has obtained the new Mercury Flo-Torq adapters and sent these great pictures.

Photo: Mercury FloTorq Adapters

LEGEND
A = Flo-Torq III Drive Sleeve, Delrin/Titanium, Mercury part # 881940A 1

B = Aft Adaptor, Silicon Bronze, Mercury part # 878584, common to both the Flo-Torq III and IV

C = Flo-Torq IV Drive Sleeve, Delrin/Titanium, Mercury part # 896232

D = Aft Adaptor, Silicon Bronze, Mercury part # 826074, common to almost all Flo-Torq II kits

E = Flo-Torq II Drive Sleeve, Delrin, Mercury part # 835290Q 1, common to almost all Flo-Torq II kits

F = Thrust Washer, Mercury part # 12-835467 1, common to the Flo-Torq II, III and IV kits for Mercury (except 225 HP EFI Four Stroke (Mercaha)

G = Prop Nut, Brass Nylock, Mercury part # 11-827614, common to the Flo-Torq II, III and IV kits, 1/2" - 13 thread will fit Mercury, OMC, Bombardier, Honda and Suzuki mid-range and V-6 outboards as well as MerCruiser Alpha One sterndrives. (I believe Yamaha uses a metric threading)

H = Tab Washer, Stainless Steel, Mercury part # 14-816629, common to the Flo-Torq II, III and IV kits for Mercury

Photo: Mercury FloTorq Adapters

Left: Aft Adaptor, Silicon Bronze, Mercury part # 826074, common to almost all Flo-Torq II kits. Right: Aft Adaptor, Silicon Bronze, Mercury part # 878584, common to both the Flo-Torq III and IV.

Photo: Mercury FloTorq adapters

[Resilient Inserts: FloTorq II, III, IV left to right.)

Photo: Mercury FloTorq drive sleeve adapter for Mercuyr and OMC propeller shalfts.

Left: OMC propeller shaft adapter. Right: Mercury propeller shaft adapter FloTorq II.

Photographs by Tom W. Clark.

Tonym posted 02-09-2007 11:38 AM ET (US)     Profile for Tonym  Send Email to Tonym     
Tom and Jim,
Nice pictures! I was wondering if you all had any information about the interchangeability of FloTorq between different size Honda engines. I currently have a 130hp that I have been using a variety of aluminum props on. I will very soon have enough information to make the move to Stainless. I also am in the process of buying a 225 Hp Honda for a different boat. Will I be able to use the same part for the 130 hp and the 225 hp? Thanks, Tonym
ratherwhalering posted 02-09-2007 01:22 PM ET (US)     Profile for ratherwhalering  Send Email to ratherwhalering     
Excellent idea Jim & Tom! I look forward to the reference article.
gqwhaler posted 02-09-2007 02:48 PM ET (US)     Profile for gqwhaler  Send Email to gqwhaler     
Tom and Jim
I would like to know if you have any information on this part 23-856163Q 1 ? is it a necessity or optional? and its intended purpose.
One of my dealers said it was only for high speed applications and not needed.And a different dealer didnt even know about the different flotorq adapters. Its frustrating to go to a dealer only to find yourself explaining to them the different flotorqs and my limited knowledge of their use.
Tom W Clark posted 02-09-2007 08:39 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
Tonym,

The Hondas, for the most part, use the same parts except the thrust washer and even then older Hondas use the same thrust washer.

You can examine the Flo-Torq application chart and compare part numbers to determine exactly what is required for a particular Honda outboard.

To get to the Flo-Torq Application Chart, you need to go through the Mercury Parts Express web site:

http://www.mercurypartsexpress.com/PartsExpress/HomePage/homepage.asp

Tom W Clark posted 02-09-2007 08:49 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
ggwhaler,

Part # 23-856163Q 1 is a plastic bushing that can be used with any Flo-Torq kit but is designed for and included with the kit for Mercury Tempest Plus, Bravo 1, Revolution 4 and Trophy Plus propellers.

Mercury found that when high performance boats were using these propellers in surface piercing applications, the propeller could develop some wobble. The bushing simply supports the front of the propeller on the propeller shaft. It is just sort of extra insurance.

I cannot think of any Whaler application that would really need it and I have been advised that it is not necessary under normal operating conditions, but like I said, it will fit in the drive sleeve of any Flo-Torq hub and will do no harm.

jimh posted 02-09-2007 09:49 PM ET (US)     Profile for jimh  Send Email to jimh     
In the last of the pictures above you'll notice that the OMC drive sleeve adapter is painted black. There have been several reports recently that these adapters were not fitting well on the propeller shafts of Bombardier motors, particularly the E-TEC. The observation has been made that the cause of these poor fits may be a build up of paint in the grooves of the adapters, and, in most cases, the adapter will fit on the propeller shaft with the application of some soft tapping to drive it into place. The excess paint is removed in the process.
jimh posted 02-09-2007 10:18 PM ET (US)     Profile for jimh  Send Email to jimh     
How the Mercury Flo-Torq IV System Works:

The propeller shaft is coupled tightly to the shaft drive adapter, and the propeller is coupled tightly to the resilient insert's outer ridges.

The inner grooves of the resilient insert and the outer splines of the shaft adapter are where the "rubber meets the road" so to speak.

In the Flo-Torq II series this coupling is quite tight and there is little flex. If you look closely at the Flo-Torq II resilient insert those grooves are narrow and fit tightly on the splines of the shaft adapter. There is not much play possible. Any flex is from the pliable nature of the material used for the resilient hub from the inner portion to the outer portion. This material is designed to break down under extreme stress, such as when a propeller strikes an underwater object.

If you look closely at the Flo-Torq IV resilient insert, you will notice that the grooves are narrow in the front (i.e., the part closest to the bow of the boat) part. These engage the splines on the propeller shaft adapter. However, this part of the resilient insert does not engage the propeller. The front part of the resilient insert is coupled to the back part by a series of rods. The back half of the resilient insert engages the propeller and is firmly coupled to.

The transmission of the rotational torque goes like this:

--Propeller shaft to shaft adapter via metal-to-metal grooves and splines;

--shaft adapter to resilient hub's forward half via tight fitting plastic grooves engaging metal ridges;

--forward half of resilient hub to rear half of resilient hub via internal rods connecting two halves;

--forward half of resilient hub's outer plastic ridges engaging metal pockets in propeller.

As the forces being transmitted become larger, the two halves of the resilient hub can twist slightly, but after a moderate amount of twist the wider grooves on the inside of the rear half of the resilient hub engage the metal ridges of the shaft adpater. At this point the transmission of forces shifts mainly to the rear half of the resilient hub.

--Or at least that is how it looks to me.

I cannot quite figure out what the Flo-Torq III kit has in terms of an advantage over the Flo-Torq II. Perhaps Tom can explain.

Tom W Clark posted 02-10-2007 07:14 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
Jim,

The Flo-Torq III works on the exact same principle as the Flo-Torq IV. One half of the drive sleeve is fixed relative to the propeller and the other half is fixed relative to the propeller shaft.

There is some degree of spring loaded deflection allowed between the two halves by the titanium rods and ultimately limited by the enlarged grooves that the external splines of the aft adapter come up against under load.

The difference between the Flo-Torq III and IV is that the positions of the drive sleeve halves are reversed between them for some unknown reason.

Jefecinco posted 02-16-2007 10:46 AM ET (US)     Profile for Jefecinco  Send Email to Jefecinco     
Ton & Jim,

I'm poised to buy a Mercury High Five for my Evinrude 115 with a 4 1/4 inch gearcase.

My problem is my inability to determine the proper Flo-Torq Adaptor Kit for this engine - propeller combination. The Mercury site seems to be telling me the 835266Q1 kit is required. That kit seems to be the only one listed for the Evinrude V4 engines in the 90 - 115 HP range.

Can you tell me what adaptor kit is correct?

Thank you.

Butch

tmann45 posted 02-16-2007 07:06 PM ET (US)     Profile for tmann45  Send Email to tmann45     
Just noticed the torque specs on my new Flo-Torq drive sleeve was 55 lb-ft without the forward bushing and 100 lb-ft if the bushing was used. Since all of the other parts are the same (?) I wonder why the extra torque if the "wobble reducer" bushing is used.
Tom
Tom W Clark posted 02-17-2007 02:54 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
Butch,

Yes, you want Flo-Torq kit #835266Q 1.

Tom W Clark posted 02-17-2007 03:43 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
Tom,

The extra torque helps ensure that the bushing fully seats in the drive sleeve. It can be a tight fit sometimes.

Jefecinco posted 02-17-2007 07:32 PM ET (US)     Profile for Jefecinco  Send Email to Jefecinco     
Tom,

Yet again, thank you for your help.

Butch

Tom W Clark posted 02-17-2007 09:21 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
Butch,

Wait a sec. I am remembering going through this before with Dave Buckda and his E-Tec 90s. I sent him a 20" Laser II and we concluded it would not fit. The same propeller is made under the Quicksilver brand with two part numbers, one of then so called "small labyrinth". I am not sure what it means but I do remember Dave saying there was an interference problem. Maybe we can get Dave to weigh in...

Jefecinco posted 02-18-2007 10:35 AM ET (US)     Profile for Jefecinco  Send Email to Jefecinco     
Tom,

I saw the foot note on the Mercury site saying the kit (835266Q 1) was applicable only with the "small labyrinth" propellers. Of course, that's my quandry. Of several propellers listed for use with the kit all are, I believe, three blade propellers. I have no idea what "small labyrinth" means.

I've done some Google searches on "small labyrinth propellers" with no useful result.

I've agreed to buy a High Five from a forum member but may have to back out if the propeller is not adaptable to my FICHT.

I would like to get Dave's input on the issue. I'm pretty certain his E-Tec 90 gearcase and propeller shaft are the same as mine.

Butch

Jefecinco posted 02-19-2007 10:10 AM ET (US)     Profile for Jefecinco  Send Email to Jefecinco     
Tom & Jim,

OK, I hope I finally have the correct information on the issue of fitting Mercury propellers to Evinrude intermediate size (4 1/4 inch) gear cases.

First, the only applicable adapter kit is a Flo-Torq II Mercury #835266Q 1.

Second, the aforementioned kit will fit only Mercury small labyrinth propellers. Large layrinth propellers require machining in order to fit intermediate size Evinrude gear cases.

Virtually all Mercury small labyrinth propellers are three blade propellers.

Consequently Mercury four or five blade propellers can not be fitted to Evinrude intermediate size gear cases without modification in a machine shop.

If anyone knows differently please share your knowlege.

If this information is correct and you feel it would be useful please include it in your new Reference article.

Thank you.

Butch

Jefecinco posted 02-21-2007 08:03 PM ET (US)     Profile for Jefecinco  Send Email to Jefecinco     
Jim & Tom,

I just received what I believe is the definitive word on using Mercury's Flo-Torq system to adapt Mercury stainless steel propellers to Evinrude intermediate size gear cases.

Ken Reeves of propgods.com, a Mercury Propeller dealer, was kind enough to personally research the question with Mercury. The result of his research is that only two lines of Mercury stainless steel propellers will adapt to the intermediate Evinrude gear case. They are:

--Quicksilver Lightspeed

--Quicksilver Thunderbolt

Both propellers are three bladed.

jimh posted 07-27-2007 09:02 PM ET (US)     Profile for jimh  Send Email to jimh     
If there are reports of using these newer style FloTorq adpaters, please append them here.
Henry posted 07-27-2007 10:19 PM ET (US)     Profile for Henry  Send Email to Henry     
On another thread with topic: Laser II propeller with Fo-torq III hub, I discuss a problem I discovered with the use of a Flo-torq III hub kit on a Laser II propeller. After the hub kit is installed into the propeller and the propeller installed on the motor, there is a wobble or side to side play in the propeller. Tom W. Clark confirmed this result with his own installation of a Flo-torq III on a Laser II (Quicksilver equivalent) prop. He still is not finished with his investigation and I await his results.
bigjohn1 posted 07-30-2007 09:13 AM ET (US)     Profile for bigjohn1    
I have a 115efi Mercury 4-stroke and replaced the stock prop with Mercury's Trophy Plus 4-blade. The prop came with a Flo-Torq II hub and I experienced the well-known and "shift clunk" and "prop rattle" at idle speeds. At the advice of Tom Clark, I retrofitted the prop with a Flo-Torq III hub and can definitely say first hand it helped tremendously at curing both ailments.

Great article Jim and Tom.

bill705 posted 07-30-2007 01:22 PM ET (US)     Profile for bill705  Send Email to bill705     
Mercury parts express shows part# 835257K10 as the Flo-torq IV kit for Verado L4SC 135-175 and it has a few part numbers that are different.

www.mercurypartsexpress.com/PartsExpress/ProductSelection/Accessories/ getProduct.asp?CID=174161186061235059272&sku=835257K10& store=ServiceParts&statusMsg=&SPHomeqty=

[Unfortunately the URL above is no longer working--jimh]

Bill

bill705 posted 07-30-2007 01:33 PM ET (US)     Profile for bill705  Send Email to bill705     
The drive sleeve is 896233A01 instead of 896232
and the prop nut is 11-52707Q1
Is this just an intermediate size drive sleeve between the flo-torq III and the Flo-torq IV for the big engines?
Bill
bill705 posted 07-30-2007 02:39 PM ET (US)     Profile for bill705  Send Email to bill705     
Here's another Flo-torq chart.

http://sites.mercurymarine.com/pls/portal/docs/PAGE/PROPS/ASK%20MERCURY/ DOWNLOADS/FLOTORGQUCKREF.PDF

[Unfortunately the URL above is no longer working--jimh]

Bill

Post New Topic  Post Reply
Hop to:


Contact Us | RETURN to ContinuousWave Top Page

Powered by: Ultimate Bulletin Board, Freeware Version 2000
Purchase our Licensed Version- which adds many more features!
© Infopop Corporation (formerly Madrona Park, Inc.), 1998 - 2000.