[TR] 1974 TR6 Bonnet Fit

[Dave]

Steel, like most materials, has a region of elasticity where if it is
deformed within this region it will return to its original dimensions.
Exceed this limit and you enter into the region of plasticity where
some of the deformation will be permanent.  When you drop a hood
(bonnet) the first thing that hits is the spring on the latch pin.  It
will compress.  Next it hits the buffer pins.  The rubber will also
compress but not much.  at this point the center of the bonnet will
start to bend downward.  How far it goes depends on the velocity which
is a function of the height from which it was dropped.

So, dropping it from 6 inches is probably not enough to bend the hood.
Nor could a normal human pushing on the center of the hood to latch it.
  But if the hood were propped open and a wind gust were to catch the
sail that is an erect hood causing the hood prop to become disengaged
allowing the hood to drop from full height, well, maybe....

Dave



-----Original Message-----
From: Cliff Hansen <cliff_hansen at earthlink.net>
To: dave n <dave at ranteer.com>; Triumphs <triumphs at autox.team.net>
Sent: Sun, Mar 2, 2014 2:15 pm
Subject: Re: [TR] 1974 TR6 Bonnet Fit


Drop from a reasonable high, as Bud said, or let it down gently.  I let
it
down onto the latch then push it closed.  The evidence on the bonnets
of my
cars were fractures in the bonnet flanges about 1 foot forward of the
rear
corners, and a distinct upward bend.  Not my doing, and the
dropped-bonnet
syndrome is only my theory for how it could have happened.

Cliff


-----Original Message-----
From: dave n
Sent: Sunday, March 02, 2014 10:08 AM
To: Triumphs
Subject: Re: [TR] 1974 TR6 Bonnet Fit

I'm going to ask about "dropping the bonnet to close it."  I've owned
my tr6
for 12 years, and that's how I've always closed it.  and the bonnet fits
just fine; always has.

how do you "let it down on the pins" and close it from there?  push
hard on
the center?

curious, and hoping to learn.

-----Original Message-----
From: Cliff Hansen
Sent: Sunday, March 2, 2014 9:15 AM
To: Bob ; Triumphs
Subject: Re: [TR] 1974 TR6 Bonnet Fit

Here's my theory which could be completely bunk - the corners are too
high,
rather than the middle being too low.  On both 4As I have owned, this
was
the case due to people dropping the bonnet to close it, rather than
letting
it down onto the pins.  You might try sighting down the edges and see if
there is any upward curvature from the front to back.

Cliff

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