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Old 04-27-2020, 04:34 PM   #1
AnthonyG
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Default Torque for Flyeheel to crank bolts?

Checked @ 70-85 ft lbs & thought seemed high so thought Id check, Remembered my old 57 Chev 283 was 60 ft lbs. Belt & suspenders
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Old 04-27-2020, 05:15 PM   #2
JSeery
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Default Re: Torque for Flyeheel to crank bolts?

Just checked F-Series manual (49-52), and flywheel bolt torque specification is 75-85 ft-lb.

That is the torque range for a 7/16-20 Grade 8 bolt.

Last edited by JSeery; 04-27-2020 at 05:25 PM.
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Old 04-27-2020, 05:16 PM   #3
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Default Re: Torque for Flyeheel to crank bolts?

65 ft lbs
edit; J Serry replied before me...with different information.
My chart, and what I've always used says 65 ft lbs
Never lost a flywheel, or my legs yet! lol
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Old 04-27-2020, 05:19 PM   #4
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Default Re: Torque for Flyeheel to crank bolts?

Checked several places, gonna go w 75ft lbs as I’m using locking wire. Probly Another Dumb question, how do I lock up Engine / flywheel to torque. Barely at 60ft lbs & flywheel turning even w full weight of engine sitting on sprocket ring?
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Old 04-27-2020, 05:28 PM   #5
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Default Re: Torque for Flyeheel to crank bolts?

I have a spanner type of device than catches the teeth on the flywheel.
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Old 04-27-2020, 05:31 PM   #6
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Default Re: Torque for Flyeheel to crank bolts?

Place a block of wood at 4:00 o'clock flywheel position between flywheel teeth and flat surface below, on PASSENGER side of engine. Push torque wrench in DOWNWARD direction from 2:00 to 4:00 position. DD
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Old 04-27-2020, 05:31 PM   #7
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Default Re: Torque for Flyeheel to crank bolts?

65-70 for the bolts with safety wire...80 for the later selflocking.
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Old 04-27-2020, 05:36 PM   #8
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Default Re: Torque for Flyeheel to crank bolts?

Quote:
Originally Posted by Brian View Post
65 ft lbs
edit; J Serry replied before me...with different information.
My chart, and what I've always used says 65 ft lbs
Never lost a flywheel, or my legs yet! lol
Here are the values posted on VanPlets site, it depends on bolt type and year range. The first chart is 32-48 and the second is 49-53.
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File Type: jpg VanPelt 49-53.JPG (74.2 KB, 36 views)
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Old 04-27-2020, 06:28 PM   #9
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Default Re: Torque for Flyeheel to crank bolts?

Thx Guys! Much appreciated! U r all always a great source!
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Old 04-27-2020, 06:43 PM   #10
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Default Re: Torque for Flyeheel to crank bolts?

I used an old wrist pin in one of the crank balance holes. That worked well to stop it turning. I used 65 - 70 ft lbs as the figure.

Last edited by Mart; 04-27-2020 at 06:49 PM.
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Old 04-27-2020, 07:26 PM   #11
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Default Re: Torque for Flyeheel to crank bolts?

I use a hammer handle between a counterweight and side of block
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Old 04-27-2020, 11:11 PM   #12
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Default Re: Torque for Flyeheel to crank bolts?

I use a piece of 1"x1" angle iron with a hole, that catches a tooth on the ring gear. Works for removal, too.
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Old 04-27-2020, 11:20 PM   #13
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Default Re: Torque for Flyeheel to crank bolts?

Duhh! SO simple...SO slick! DD


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Old 04-27-2020, 11:24 PM   #14
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Default Re: Torque for Flyeheel to crank bolts?

Nice setup!
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Old 04-28-2020, 01:43 AM   #15
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Default Re: Torque for Flyeheel to crank bolts?

Simply clamp a vise grip to the flywheel ring gear. It is shown in Vern Tardels book. I doubted the method, so grabbed a vise grip and torqued the bolts down to 80. No problem at all.
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Old 04-28-2020, 07:41 AM   #16
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Default Re: Torque for Flyeheel to crank bolts?

Good stuff! Neat tricks Ross & Titus
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Old 04-28-2020, 08:02 AM   #17
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Default Re: Torque for Flyeheel to crank bolts?

Hey TitusDH, Wow worked like a Charm!!!
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Last edited by AnthonyG; 04-28-2020 at 08:14 AM.
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Old 04-29-2020, 01:54 AM   #18
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Default Re: Torque for Flyeheel to crank bolts?

Great !!
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Old 04-29-2020, 11:49 AM   #19
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Default Re: Torque for Flyeheel to crank bolts?

Perfect timing. I'm in the process of putting mine back together.
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