Author Topic: Head bolt torque  (Read 517 times)

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Offline a_disalvo

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Head bolt torque
« on: March 13, 2018, 11:58:23 AM »
getting ready to install the heads on the S&S 98" sidewinder, but I'm using a click type torque wrench with the 7/16" extensions to reach into the hard places. The extensions measure 2" C to C,  so do I add or subtract to the wrench setting? Thanks, Frank

Offline BKACHE

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Re: Head bolt torque
« Reply #1 on: March 13, 2018, 12:04:59 PM »
If you use it at a 90* angle it is the stock ft/lb.
If it is straight off the end (giving you more mechanical advantage) you would have decrease the amount of foot lbs by the tabled amount. 
So do you have the snap-on FRES14?
Does it fit on each of the head bolts? 
The reason I ask is it is a tight fit between the bolt and the cyl.
« Last Edit: March 13, 2018, 12:15:26 PM by BKACHE »

Offline a_disalvo

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Re: Head bolt torque
« Reply #2 on: March 13, 2018, 12:35:21 PM »
Using Snap-On FRDH141, 2" center to center. HD manual says torque to 55-75 lb/ft. Quite a range!! Don't have any tables to adjust so hoping someone can give me the settings for different angles. Thanks, Frank

Offline BKACHE

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Re: Head bolt torque
« Reply #3 on: March 13, 2018, 12:51:48 PM »
In the tech tips section - I think the adapter sheet is posted.
FSG posted a link in the 'Tech Tips' section.
« Last Edit: March 13, 2018, 12:55:53 PM by BKACHE »

Offline a_disalvo

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Re: Head bolt torque
« Reply #4 on: March 13, 2018, 01:00:28 PM »
Cool, thank you!!! Frank

Offline guppymech

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Re: Head bolt torque
« Reply #5 on: March 13, 2018, 03:13:57 PM »
Torque wrench formula for use with adapters.
Multiply the length of the torque wrench times the torque setting on the wrench.
Measure the length of the torque wrench plus the adapter then divide the product of the above calculation by the new length with the adapter to get the new torque wrench setting.

ex. torque wrench length= 12 inches x 25 ftlbs torque equals 300
Torque wrench adapter length is 3 inches + 12 inches = 15 inches.  Divide 300 by 15 to get the new torque wrench setting of 20 ftlbs.

As can be seen with the torque adapter at 90 degrees the length of the torque wrench won't change so there is no need to add or subtract from the torque wrench setting.   Also when using a adapter if the torque wrench is set at the lower end of a range the applied torque will usually be under the upper limit.
« Last Edit: March 13, 2018, 04:46:06 PM by guppymech »
'84 FXE, '02 883R

Offline Mule

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Offline a_disalvo

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Re: Head bolt torque
« Reply #7 on: March 14, 2018, 06:27:28 AM »
Lot of good info there Mule, Thanks, Frank

Offline tomcat64

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Re: Head bolt torque
« Reply #8 on: March 21, 2018, 01:48:27 PM »
I have a craftsman 3/8 torque wrench and all I do is turn it upside down, I marked the back side of the torque gauge with a sharpie where the 65ft/lbs spot is.. works great!

Offline dirtymike

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Re: Head bolt torque
« Reply #9 on: March 22, 2018, 05:05:47 PM »
how does turning the torque wrench upside down make torque different

Offline 76shuvlinoff

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Re: Head bolt torque
« Reply #10 on: March 22, 2018, 05:19:01 PM »
 This is what I use to do head bolts, the wrenches are sized for the 12 pt bolts on S&S heads but you get the idea.

Being defenseless does not make you more safe.

Offline JW113

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Re: Head bolt torque
« Reply #11 on: March 22, 2018, 07:28:21 PM »
how does turning the torque wrench upside down make torque different

Because he bought the torque wrench in Australia.

 :hyst:

What he means is he has to turn the beam torque wrench upside down to get it on the head bolts, and can't see the torque scale. Clever solution if you ask me.

-JW
2004 FLHRS   1977 FLH Shovelhead  1992 FLSTC
1945 Indian Chief   1978 XL Bobber

Offline dirtymike

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Re: Head bolt torque
« Reply #12 on: March 23, 2018, 12:18:11 PM »
I thought that was a deflection wrench.

Offline a_disalvo

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Re: Head bolt torque
« Reply #13 on: March 25, 2018, 06:15:45 AM »
Bike is together and started, not going anywhere in NE Pa. LOL, Question, do you retorque the heads after a few heat cycles??? Thanks, Frank

Offline 76shuvlinoff

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Re: Head bolt torque
« Reply #14 on: March 25, 2018, 12:17:32 PM »
Bike is together and started, not going anywhere in NE Pa. LOL, Question, do you retorque the heads after a few heat cycles??? Thanks, Frank

 I do, twice, even though I remember someone telling me it wasn't necessary with the MLS gaskets.
Being defenseless does not make you more safe.

Online crock

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Re: Head bolt torque
« Reply #15 on: March 25, 2018, 02:42:42 PM »
Yes. And again after 500 miles or so. I also make a habit of checking them and the base bolts every oil change. Blown head gaskets are bad but when they come loose at the case  :cry: :cry: :cry: :cry: :cry: :cry: :cry:
Crock

Offline Burnout

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Re: Head bolt torque
« Reply #16 on: March 26, 2018, 07:24:04 AM »
Watch out when using a clicker torque wrench.

Some clicker torque wrenches will not click if you are pulling counter clockwise!

I discovered this when flipping the dog bone over to get at the LR head bolt.
They don't call me Ironhead Rick just because I'm "hard headed"

Offline tomcat64

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Re: Head bolt torque
« Reply #17 on: March 26, 2018, 09:04:40 AM »
how does turning the torque wrench upside down make torque different

Because he bought the torque wrench in Australia.

 :hyst:

What he means is he has to turn the beam torque wrench upside down to get it on the head bolts, and can't see the torque scale. Clever solution if you ask me.

-JW


much better explanation of what I meant.. thank you.. LOL