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Thread: Bellhousing Torque Specs

  1. #1
    Senior Member cv2065's Avatar
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    Bellhousing Torque Specs

    Anyone have torque specs for the Ford Aluminum bell to block and TKO600 trans to bell? Thanks!
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    Senior Member CraigS's Avatar
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    I would look up a generic torque chart. Be sure to get one that lists different TQ specs for dry and lubed bolts. And also be careful to find one specific to bolts going into aluminum.
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    Senior Member cv2065's Avatar
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    Quote Originally Posted by CraigS View Post
    I would look up a generic torque chart. Be sure to get one that lists different TQ specs for dry and lubed bolts. And also be careful to find one specific to bolts going into aluminum.
    Thanks Craig. That’s been the challenge. I’ve found ranges from 25-60 ft-lbs, so was going to settle at 30-35, as none really differentates for an aluminum bell.
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    Seasoned Citizen NAZ's Avatar
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    cv, it's best to find the torque value in a maintenance manual AND ensure you are using the correct fasteners. However, as Craig suggested the use of a torque chart is acceptable and much better than the by guess and by golly method of using a breaker bar to tighten fasteners.

    I worked very closely with Fastenall engineers for about 6-years in one of my previous lives (my term for the various industries I moved into and out of) and learned quite a lot about fasteners. Here are some tips:

    * Look up the torque value for the grade of cap screw you are using and if you are using a lubricant, make sure to use the value for lubricated threads (can be significantly less torque for lubricated). The torque value is a relative measurement that achieves proper bolt stretch and clamping load. Think of a cap screw (bolt) as a very stiff spring that you stretch to apply a clamping load to the bolted parts. It's the fastener that dictates the torque value not the material it's threaded into (exceptions are rare).
    * Always use a hardened flat washer on the end you are applying torque to (nut or cap screw) as it will give you a more consistent coefficient of friction compared to the variety of surfaces and finishes on the parts you may be bolting together. A significant amount of the torque applied is required to overcome the friction under the head of a cap screw or a nut. Enough so that variance in the friction in this area can significantly affect the stretch of the fastener and the clamping force. Read that as setting yourself up for failure.
    * Ensure you have proper thread engagement and the threads are clean & undamaged. For most steels you want the thread engagement at least equal to the fastener diameter (1.5 times the diameter for aluminum). Threads fail in shear so you want to get enough thread engagement that the fastener will fail in tensile rather than shear. Shear resistance is typically ~60% of the rated tensile strength of a fastener.

    All fasteners have the grade (or metric property class) stamped into the head (nut too). Learn to read this as it's important to use the correct grade and the correct torque for the grade. A quick internet search will provide you with photos of what the marking look like and how to read them.
    Last edited by NAZ; 01-28-2019 at 11:24 AM.
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    Senior Member frankb's Avatar
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    From the 1970 Ford Shop Manual torque spec:

    "Flywheel housing to cylinder block bolts, 8 cylinder: 40 - 50 ft-lbs"

    Frank B
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    Senior Member cv2065's Avatar
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    Quote Originally Posted by frankb View Post
    From the 1970 Ford Shop Manual torque spec:

    "Flywheel housing to cylinder block bolts, 8 cylinder: 40 - 50 ft-lbs"

    Frank B
    Thanks for the replies guys!
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