Home › Forum › Ask A Member › 1956 Johnson 30hp Motor Won’t start But Spark Plugs have Spark!
- This topic has 17 replies, 9 voices, and was last updated 4 days, 17 hours ago by
Bob Wight.
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June 2, 2026 at 1:52 am #320603
Someone should have told me I could divide that by 12!! LOL – obviously a Noob when it comes to torque wrenches!!
June 2, 2026 at 2:23 am #320606Everyone talks about using a torque wrench on the flywheel nut. I have looked into it and it says for my motor it should be 720-780 in/lbs but I can’t even find a wrench that goes that high. Any suggestions?
Someone should have told me I could divide that by 12!! LOL – obviously a Noob when it comes to torque wrenches!!
Haha! 🙂 It’s great that you are using a torque wrench on the flywheel nut. Some people use impact guns, but I believe proper flywheel torque is important for both you and your motor’s safety. Keep up the good work!
June 2, 2026 at 7:54 am #320618Everyone talks about using a torque wrench on the flywheel nut. I have looked into it and it says for my motor it should be 720-780 in/lbs but I can’t even find a wrench that goes that high. Any suggestions?
Just divide your inch pounds by 12 and use a foot pound wrench!
dale
June 2, 2026 at 8:44 am #320620“inch pounds” is different than “foot pounds”.
I believe 720 inch pounds is 60 foot pounds.
720 / 12 = 60Prepare to be boarded!
June 2, 2026 at 9:23 am #320621yes… chatgpt can solve these questions and is actually an pretty good search utility for most problems… but the POPE does not like it 🙂
To convert inch-pounds (in-lb) to foot-pounds (ft-lb):
ft-lb=in-lb12\text{ft-lb} = \frac{\text{in-lb}}{12}ft-lb=12in-lb
Since there are 12 inches in a foot, divide by 12.
Examples:
- 24 in-lb = 24 ÷ 12 = 2 ft-lb
- 60 in-lb = 60 ÷ 12 = 5 ft-lb
- 120 in-lb = 120 ÷ 12 = 10 ft-lb
- 240 in-lb = 240 ÷ 12 = 20 ft-lb
Joining AOMCI has priviledges 🙂
June 3, 2026 at 3:41 pm #320741720 inch pounds divided by 12 is 60 Foot pounds which I believe is the correct torque.
www.kenadianoutboards.com
June 3, 2026 at 5:06 pm #320754June 3, 2026 at 8:03 pm #320778720-780 in-lbs is the same as 60-65 ft-lbs. You won’t find an in-lb torque wrench that will give you 720-780 in-lbs but you can easily find a ft-lb torque wrench that will give you 60-65 ft-lb torque.
Bob
1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1955 Johnson QD-16
1957 Evinrude Fastwin 18
1957 Evinrude 3022
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20
1982 Evinrude 25hp“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." -
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