Inside those dreaded box sections

[Richard Williams]

Not my favorite task, but I'm removing the whole floor of this chassis to prepare it for replacement. I'd welcome ideas on preparation. I don't really understand etch primers, so would Zn primers like POR15 be ok on the bare metal after the sandblaster has done his bit?

Second question:
I need to replace the rear outer suspension mounts (surprise ,surprise) I have no jig . Could I use the rear suspension itself to position the replacement part. That is if three other mountings are in position will the fourth be predictably in position?

Attached photos of the inside of some of the box sections

 

[bantamallan]

I think the rear suspension is too heavy and cumbersom to be used as a jig but its worth a try
Allan

 

[malcolm]

I don't think it would be much good for the centre mounts - it's a bit floppy and the springs move the mounting points. For the outer mounts it might be OK, though not so easy as a jig. If you were going to try it I'd take some measurements to work out where the top bolt should be, and if you were making your own replacement mounts check the tracking after everything has been bolted on. Can't see that being a problem.

If the inner mounts were wrong you'd get a lean to the car, Outer mountings seem more about keeping the wheels pointing in the right direction.

POR 15 is highly rated. That would make a great coating while you have the chance. Dinatrol would be good once everything is back together.

 

[ade]

chassis painting

you'll have to be very careful, if you sandblast flat plates, much warping could ensue, it is also very agressive, and i wonder whether it would significantly work-harden such thin sheet....with painting, you must use Metal Ready acid etch prior to POR15 (which is not a zinc primer, but a single pack isocyanate topcoat, although its UV sensitive over long periods)....but preparation is vital ...if you feel you can't fully degrease/etch a panel, then don't paint it, but if you can , then i'd give enclosed box sections just 1 coat POR15, but then masses of Dinitrol or Supertrol regularly. It strikes me that there's not much in the way of drainage holes in these box sections, so that may be worth looking at...ade