I can't help on the question of amount but I can say I have noticed over
many years even with tin-tops that when jacked anywhere other than under
the suspension the sound the doors make when closing is different to when it
is on its wheels (or jacked under the suspension), implying that even these
cars flex a little. If you raised the wheels off the ground when jacking
under the crossmember then I would say the sills are probably fine, although
I note the engine is out. The engine and gearbox represents about 25% of
the total vehicle weight.
Bubbling in original steel and paintwork *usually* implies it is from the
inside - easily verified by removing the paint and surface rust. If you are
left with pinholes then it is, if you have shiny metal it isn't. However
the metal and processes used by BL in the 70s was so poor and/or erratic
that surface rusting was quite possible. In replaced/repaired/repainted
steel bubbling is as likely to be from the surfcae as from inside, as many
repairers techniques were probably worse than BLs!
PaulH.
----- Original Message -----
From: Dan Hackney <danhackney@nc.rr.com>
To: <mgs@autox.team.net>
Sent: Friday, March 16, 2001 2:33 AM
Subject: mgb painting/bodywork/sill repair ?'s
> I just did some rudimentary tests on my rolling chassis.
> First, with car still on four stands under suspension components, I put a
> floor jack under the frame rail on the front and lifted. The whole side
of
> the car came up without creaking or visible flexing. OK. I put the car
> down but left one stand under one side of the front suspension. bounced
the
> body diagonally and it felt solid. Then, car back on the ground, I stood
on
> the sill with the door closed and jumped up and down lightly and observed
> the gap betweent the door and the body, it decreased noticably with the
> downward force. I then put the floor jack under the central cross member
> behind the jacking point and lifted the side of the car. Gap increases in
> size by approx. 1/16".
> Also, i filed off one of the rust bubbles and found shiny metal
underneath.
> Does bubbling always start from the inside?
> Any help appreciated in interpreting these tests. Recall that the engine
is
> out of the car, making it much lighter.
> thanks
> -Dan
> '72MGB
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