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By Mats Paulsson - 2 Years Ago
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Hi
Do any one knew what type of bolt it is to lock the harmonic balancer on a 312 from -56.
The length, thickness and type of thread, and also tightening torque and where to find one, i have searched all over the internet without result......
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By charliemccraney - 2 Years Ago
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9/16"-18. I don't have the length handy. I've use grade 8 bolts, from a hardware store or industrial supply. You may have to trim to length depending on that requirement and what is available.
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By Joe-JDC - 2 Years Ago
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9/16" x 18 x 1.920" overall length, 1.500" thread length, with .230" thick hardened washer. Joe-JDC
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By 55blacktie - 2 Years Ago
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Hill's Thunderbird Part # 6A340 Bolt, Harmonic Balancer, $3.00. Order online at www.hillsresto.com
My catalog is not current; the price might have gone up.
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By 55blacktie - 2 Years Ago
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85-95 ft.lbs. per Ford manual.
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By Mats Paulsson - 2 Years Ago
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Hi.
Do you know the diameter of the washer?
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By DryLakesRacer - 2 Years Ago
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I’m not sure so I won’t comment on an original but I’m a firm believer in using Belleville washers on cranks bolts or studs. The are slightly larger in diameter than a stock size flat washer for the diameter of the bolt. I use 2 and buy them thru Mc Master-Carr.
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By Joe-JDC - 2 Years Ago
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The damper washer is a snug fit to the inside of the damper, you cannot go larger like the BBC washer. It will not fit. I will check my 312 damper washer for size if no one else measures theirs first. Joe-JDC
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By Joe-JDC - 2 Years Ago
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Damper washer is 1.750" diameter, ~.230-.235" thick. Joe-JDC
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By Mats Paulsson - 2 Years Ago
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Thanks a lot Joe and all others!!
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