Topic: 6039 Speeditwin Flywheel torque – Antique Outboard Motor Club,Inc

This topic has 23 replies, 5 voices, and was last updated 4 years, 3 months ago by Buccaneer.

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December 31, 2019 at 5:53 pm #190351
Buccaneer
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US Member
I’m not finding any flywheel torque specs for the Speeditwin.
Is there an official torque for these?

The flywheel, crankshaft keyway and key were totally messed
up on this unit when I got it. I don’t want the same to happen
to my replacement flywheel.

For starters, I torqued it down to 60 ft pounds (after I confirmed
nice spark).

Being the flywheel nut is a two sided flat, I’m doubting if anyone
ever put a torque wrench on these Speeditwins.

Did Evinrude have a special socket for these nuts?

I had to improvise to use my torque wrench, using a 1/2″ to 3/4″
drive adapter, flat iron, and two C clamps. Crude, but it worked fine.

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December 31, 2019 at 6:20 pm #190358
Samuel Phelps
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US Member - 2 Years
I was told 60 ft lbs was correct .. I pick up a crowfoot socket 1/2” drive at IIRC Advanced Auto parts … 3/4” I think …
December 31, 2019 at 9:01 pm #190367
Buccaneer
Participant
US Member
Thanks for the reply. Does using a crow foot wrench on the torque wrench change the accuracy
of the torque wrench reading?

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December 31, 2019 at 9:21 pm #190369
bobw
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US Member
If you set the crows foot wrench in a straight line with the torque wrench head then yes, it will result in a higher torque setting than what you want. The crows foot should be set 90 degrees to the torque wrench head. Here’s a video that explains it.

https://www.youtube.com/watch?v=fBjr9-FDWYw

Bob

1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1957 Evinrude Fastwin 18
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20

“Every 20 minute job is only a broken bolt away from a 3-day project.”
"Every time you remove a broken or seized bolt an angel gets his wings."
December 31, 2019 at 9:25 pm #190370
Samuel Phelps
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US Member - 2 Years
That’s a good question …
And I don’t have an informed answer ….
I don’t really think it would decrease the torque a lot . The 1/2” drive hole on the socket is fairly close
to the open end of the wrench center …
December 31, 2019 at 9:38 pm #190372
Samuel Phelps
Participant
US Member - 2 Years
Interesting video … I picked up one of these to use .. I wonder how accurate it is ..
https://www.harborfreight.com/12-in-drive-digital-torque-adapter-63917.html
January 1, 2020 at 8:50 am #190384
jacksonm29
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US Member
I believe that the Speeditwin owners manual says “hammer on wrench”
I take that as pretty darn tight.
Leads me to believe that OMC wasn’t concerned with an accurate torque, as long as it was tight.

I believe that the threads are 5/8-18. They would probably be good for 100 ft lbs plus, as threads go.

I personally use a modified strap wrench on the flywheel to hold it still and a 3/4 wrench in the other hand, and pull it tight and then some.

A loose flywheel on an opposed twin will scrap your motor quickly.

Mark
January 1, 2020 at 10:03 am #190386
Buccaneer
Participant
US Member
I found this information this morning that says 75 to 80 foot pounds of torque
for the Speeditwin flywheel. Thanks for your replies.

Happy New Year!

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January 1, 2020 at 7:33 pm #190454
garry-in-michigan
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disappeared post
January 1, 2020 at 7:44 pm #190460
garry-in-michigan
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eighth thy –
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