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From: Mark Olson on 10 Dec 2009 16:36
zymurgy wrote:
> On 9 Dec, 22:25, Mark Olson <ols...(a)tiny.invalid> wrote:
>> zymurgy wrote:
>>> i've been torqueing by feel for over 25 years now. The only
>>> bolts that I religiously torque are head bolts,
>>> The only bolt I broke recently was using a torque wrench, as I was
>>> bolting down the crankshaft bearing journals on Nige's old firestorm.
>>> 2 of the bolts stretched, needing replacements from Honda. I should
>>> have used 'feel' instead ;)
>> Were those bearing cap bolts oiled at all, by any chance?
>
> Not specifically, but there might have been a bit of oil hanging
> around. A bearing journal is a pretty oily place, by design :)

In my limited experience I've usually used assembly lube and confined
it to the actual bearing area. Once everything's together, spin the
engine for a good while with the starter with the ignition disabled
to make sure the oil pump gets primed and all the bearings have oil
to them before attempting to start it.

> Christ, 35lb/ft is some torque. Is that steel into aluminium threads ?
> I just nip those up gently. Long practice from doing (old style) Mini
> sump plugs.

It is indeed a steel plug going into an Al sump. All my other bikes
that happen to use the same size sump plug, regardless of make,
are spec'd in the ~14 ft-lb range, which makes me wonder why Yamaha
continue to get it wrong.

Just one of those things where experience is an invaluable asset.

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