Am replacing floors and sills. The new floor came with radius arm mounts
already attached. With floor dry fitted, I notice that the radius arm mount is
about 1/8" off - the book says 2 15/16" from the center of the mount to the
front face of the rear wheel aperture, mine is at 2 13/16". The dimension
from the center of the front lower IRS mounting hole to the front face of
the wheel aperture is within 1/32" of spec. I could move the floor
forward 1/8",
but it is fitted as far forward as I can get it and still be able to weld
to the rear bulkhead flanges, have the rear engine mount more or less
right, and the floor flange that fits the front of the trannie tunnel
snugged up. I also have to think about the reaction plate fitting.
So the question is how critical is that dimension? Would the rubber
radius arm bushings take up 1/8" variation? The alternative is to weld an
extension on the rear floor, rework the floor flanges that mate to the
tunnel, cut off some floor at the front, and hope I don’t have to egg out
the frame rail for the reaction plate.
In reply to a message from John North sent Thu 17 Nov 2016:
I’m also fitting new floors and paid to have the radius arm
cups riveted to the floors. It seemed to me that the tunnel
fixings which go through the gearbox mount and through the
floors pretty much dictate where the radius arm cups will
end up?
I can’t use the wheel arch aperture as it’s rotted away and
will need a repair panel. If mine doesn’t fit I’ll resort to
brute force and ignorance.–
1965 FHC 1E20390, 1976 Lotus Esprit, 1976 Mini 1000
Bedford, United Kingdom
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from John North sent Thu 17 Nov 2016:
From first principles this would seem to be the important
measurement.–
The original message included these comments:
from the center of the front lower IRS mounting hole to the front face of
the wheel aperture is within 1/32’’ of spec. I could move the floor
forward 1/8’',
In reply to a message from John North sent Thu 17 Nov 2016:
John,
They can’t be moved forward because they have to be aligned
with four bolts which attach the chassis rails to the engine
frames.–
Doug Buchan
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from Paul Coleman sent Thu 17 Nov 2016:
To my mind the collision alignment diagram lists two kinds of
dimensions: ‘‘Hard points’’ and ‘‘Advisory points’’. A hard point will
reference a mounting surface or hole, an advisory point would be
the edge of an opening (like a wheel well, or bumper/license plate
mounting).
I would reference the location of the cups to the mounting holes
for the IRS.
Given the size of the dimensions listed trying to measure to any
tolerance less than 1/32 would be silly. The smallest denominator
in the table of dimensions is 1/32, which is most probably meant to
be half a division of a 1/16 graduated tape or rule.
Set up your datum really carefully, make your measurements
carefully using the most relevant hard points for the panel you are
fitting, using a 1/16 graduated tape, clamp, measure again, tack,
measure again, weld.
For the cups the most relevant dimensions are W, I+J, and L.
Andrew–
The original message included these comments:
cups riveted to the floors. It seemed to me that the tunnel
fixings which go through the gearbox mount and through the
floors pretty much dictate where the radius arm cups will
end up?
–
1968 3.8S
Zurich, Switzerland
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from John North sent Thu 17 Nov 2016:
If you are replacing the complete floor with the rail
and the fixed cup, I don’t see how you could move that
forward, or backward. The bolt fixing the reaction plate
dictates the forward/aft setting. At least thats how I
fixed my MR floors with the fitted cups. I was just
careful setting left/right towards the back.
Martin–
The original message included these comments:
the wheel aperture is within 1/32’’ of spec. I could move the floor
forward 1/8’',
–
Martin Scherz 1970 OTS 4.2
Esslingen, Germany
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from John North sent Thu 17 Nov 2016:
I would put the floors where they belong and not move them
forward.You have some wiggle room with the radius rods,but
you don’t with your trans mission mounts and your tunnel.
Had a similar experience and it worked out fine
DJ–
59strat
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
OK, I installed the reaction plate and the engine frames plus the
engine mount (fortunately I allowed room for this when I built the
rotisserie mounts), and these all fit correctly with the floor where
it is so you are all right that I can’t move the whole floor forward.
So it’s back to the original question, how critical is 1/8"?
Because the only option left is to grind off the rivets holding the
mount then weld over the holes in the floor and the stiffener, then
redrill the holes in the right place. Not a such big deal, I do have
some of the Hiloks from a previous car… On the last one I did I
had the same problem, but I just did the rear floor sections so moving
the floor forward was no problem.
John North
1967 S1 OTS
1969 S2 CoupeOn Fri, Nov 18, 2016 at 1:10 PM, Paul Coleman paulcoleman70@hotmail.com wrote:
In reply to a message from Doug Buchan sent Thu 17 Nov 2016:
They shouldn’t be further forward than the toe panels
either. The floors should be 48’’ wide.
The original message included these comments:
They can’t be moved forward because they have to be aligned
with four bolts which attach the chassis rails to the engine
frames.
–
1965 FHC 1E20390, 1976 Lotus Esprit, 1976 Mini 1000
Bedford, United Kingdom
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from John North sent Fri 18 Nov 2016:
If mine are within 1/8’’ I’ll be more than happy. I can deal
with that using brute force.
If the 2 bolt holes in the transmission tunnel line up with
the holes in the floors and the 3 holes for the cross-member
also line up that sets the distance for the cups so they
must be right?–
1965 FHC 1E20390, 1976 Lotus Esprit, 1976 Mini 1000
Bedford, United Kingdom
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–