What about roll pins?
-jimb
Randall wrote:
>"Ordinary" bolts have plain shanks considerably smaller than the nominal
>diameter, frequently even smaller than the actual major diameter of the
>threaded
>portion (which is smaller than the theoretical major diameter). I'm fairly
>certain this should not be true of the "dowel bolts" (the name given in the SPC
>for the 6 digit part number).
>
>Furthermore, the dowels (either pin or bolt) are what set the alignment for the
>input shaft in the pilot bearing. Any significant error here will cock the
>input shaft and cause eventual problems inside the gearbox. In addition, the
>input shaft may drag in the pilot bearing, causing difficult shifting. I can't
>prove it (never having owned a TR6), but I'll bet this is at least part of the
>clutch problems that TR6s are so notorious for.
>
>I rummaged through my 3/8" bolt drawer measuring shanks ... the smallest was
>.365" and the largest was .370". That means even choosing the largest one
>would
>allow a misalignment of .010", surely too much.
>
>Thanks for the reply, Graham, but I don't believe this is the right answer.
>Note that the flywheel housing is held to the engine block with precision
>ground
>dowels, and the earlier TRs use them as well. I am reasonably certain that the
>150743 bolts have precision ground .375" shanks rather than being ordinary
>rolled bolts. Same thing goes for the 132872 dowel bolts specified for the TR6
>(even though some vendors have said the same thing, that these can be replaced
>with ordinary bolts). Size does matter, here.
>
>Happy New Year to all
>Randall Y
>
>
>
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