Re: to change a Honda Accord 1988 model timing belt

jim beam <nospam@xxxxxxxxxxx> wrote in
news:GqidnS6FuPfYb_veRVn-jQ@xxxxxxxxxxxxx:

> TeGGeR® wrote:
>> jim beam <nospam@xxxxxxxxxxx> wrote in
>> news:Ap6dnV6_ytVekfjeRVn-rQ@xxxxxxxxxxxxx:
>>
>>
>>
>>>regarding citations for the honda pulley bolt, i don't have anything
>>>immediately to hand. you have to go back to basic engineering
>>>principles. if you can accept that there is some angular lash in the
>>>pulley, you can figure out the inertial predominance of that lash as
>>>the crank rotates.
>>
>>
>>
>>
>> It's still wrong. That bolt does NOT turn.
>
> it can and it does. for a simple citiation, check out:
>
> http://www.sheldonbrown.com/gloss_p.html
>
> and read the section labeled "pedal" and note the reference to
> precession.
>



Ah, there's a word for what we're talkng about! Thanks. That gives me more
ammunition to refute your argument.

Your comparison of bike pedal and car crankshaft is not a valid one, for
one major reason:
A bike pedal bolt directly transmits torque as its primary function. The
crank bolt simply clamps two masses together. Torque is transmittred by the
mass, not the bolt. This is a very critical distinction.

By your own admission, I am focusing on the bolt, not the mass attached to
it. You are committing ths same sin, but in reverse.

Consider that if the clamped mass can move in ONE direction, it follows
that it can move BACK IN THE OTHER. And for your theory to work, the
clamped masses would have to move back and forth repeatedly.

Since it is much easier for the bolt to back out (releasing tension) than
to screw in some more (increasing tension), the bolt in a such a joint
would tend to LOOSEN. And if you do your own Google searches, you'll find
ALL references to clamp-bolts and precession referring to LOOSENING.

This back-and-forth causes an effect known as "fretting", which ultimately
LOOSENS the bolt.

The Honda bolt does not loosen because it has been tightened to a position
that will remain undisturbed until somebody disturbs it.

If you fail to tighten a Honda bolt sufficiently, it will FALL OUT, not
tighten more. My neighbor three doors down had just that happen to his
Prelude years ago. His neighbor replaced the timing belt, but lacking a
torque wrench, he just tightened the crank bolt to what felt right. Well,
tight it was, but NOT TIGHT ENOUGH. *Precession* from the clamped mass
BACKED THE BOLT back out again and the pulley fell off on the highway!

The theory that the bolt tightens flies in the face of everything I've been
able to find. It flies in the face of logic.

The joint, once correctly torqued, does NOT move. That bolt gets harder to
remove NOT because it tightens more from engine rotation, but from
corrosion, and (I think) "settling" at the surface texture level.

--
TeGGeR®

The Unofficial Honda/Acura FAQ
www.tegger.com/hondafaq/
.

Relevant Pages

  • Re: to change a Honda Accord 1988 model timing belt
    ... Here's an image of a bolt. ... Which ultimately tightens itself once properly torque. ... > BACKED THE BOLT back out again and the pulley fell off on the highway! ...
    (rec.autos.makers.honda)
  • Re: to change a Honda Accord 1988 model timing belt
    ... if you can accept that there is some angular lash in the pulley, you can figure out the inertial predominance of that lash as the crank rotates. ... A bike pedal bolt directly transmits torque as its primary function. ... remove NOT because it tightens more from engine rotation, ...
    (rec.autos.makers.honda)
  • Re: to change a Honda Accord 1988 model timing belt
    ... I have very serious reservations about your assertion that the bolt tightens over time due to heat cycling. ... The pulley is keyed positively in place, and the bolt has far less mass than the crankshaft. ... If the person doing the operation can not tell if the valves are closed by that method, then he shouldn't be doing this kind of work anyway. ...
    (rec.autos.makers.honda)
  • Re: to change a Honda Accord 1988 model timing belt
    ... I do mean no more than two) posts to Usenet that talk about such a bolt. ... microthread design means that a certain torque correlates even less than ... > Which ultimately tightens itself once properly torque. ... > the mechanism will fail and the pulley will fall out. ...
    (rec.autos.makers.honda)
  • Re: to change a Honda Accord 1988 model timing belt
    ... I have very serious reservations about your assertion that the bolt ... Consider that the crankshaft nose heats and cools identically with the ... Neither does it make sense that the bolt tightens because of the way ... The pulley is keyed positively in place, ...
    (rec.autos.makers.honda)