Originally Posted by Jono
I thought you were a "student engineer" ? You fell a sleep through yer lectures or what?
There may have been a few occasions where I may have been feeling a little "under the weather" in a 9 o'clock lecture
I'm all graduated now though.
I was aware of the increased clamping force you can get from a finer pitch but thought a big old spanner would do a good job
Going back a little bit, my dad and I wondered why it was necessary to have high tensile bolts clamping a brittle cast aluminium outboard saddle which would surely fracture before a bolt broke (unless as you say jono, a coarse pitch bolt was damaged through overtightening with a big old spanner!). I assume now that it is purely to be on the safe side and to get as much clamping force as possible.
Thanks for the clarification on the bolt grades, much appreciated. I never really studied bolts specifically (only briefly) but did do a lot on stainless steels.
I have gone for the tohatsu bolts because I can get them quickly and easily from a place near me, and in theory (
) they should be exactly what I require...fine pitch M12 (although they couldn't tell me what tensile strength they were).
I hope this thread may be of use to someone who is fitting a second hand engine in the future.
Thanks everyone for your contributions!