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

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

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December 31, 2019 at 5:53 pm #190351
Buccaneer
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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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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
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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
Bob Wight
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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
1955 Johnson QD-16
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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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
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US Member
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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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
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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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