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Old 02-12-2018, 07:43 PM   #20
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Join Date: Jul 2017
Location: Spokane, Washington state
Posts: 202
Default Re: Why no lock-washers?

I believe the Henry design accounted for several things. The washers on the exhaust manifold are curved and also very thick. When you tighten a nut onto a stud with a flat washer it is normal torque, but if tightening a curved dome shaped washer it introduces extra push back force on the nut (sort of like a lock washer). The thickness and correct cast material reduces the risk for brittle heat breakage as parts have similar thermodynamic characteristics.

Just saying there may be very good reasons. I can imagine that the engineers were doing a good job and did a lot of testing. I try to go original.
engine/frame # late May1930, Briggs body actual build date # indicates late Aug/Sept. 1930 68B fixed seat Cabriolet
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