Non 5-mph bumpers?
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Join Date: Mar 2008
Location: Pacific Northwest USA
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I had an 84 XJS back in the day. I never got over the pure uglyness of those bumpers. It was like the Jag engineers were so mad at the 5 mph standard that the set out to give us the most horrid solution they could come up with.
All this was before the internet was matured and I couldn't get info on a solution. I was able to get a wonderfull set of European head light assemblies installed for around $300, if I recall.
All this was before the internet was matured and I couldn't get info on a solution. I was able to get a wonderfull set of European head light assemblies installed for around $300, if I recall.
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So here is the scoop on sucking in the 5mph bumpers:
I'd recommend starting with the rear as access is much easier. Remove the chrome bumper surround first. Three bolts each side from inside the trunk, and two in the center underneath. Then loosen or remove the rubber cover for the main bumper. Unbolt the bumper and take it off.
Now you will be left with two pistons sticking out from the back of the car. Go into the trunk and find the backside of the pistons under your carpet. You'll see a 17mm nut on both sides. Remove the nut and push out the piston shaft.
Once out you'll see another 17mm flange nut on the back of the piston assembly. Remove that nut. Finally you can unscrew the piston from its carrier by turning it out from the end where the bumper attaches.
Now you have the bare piston. You'll see that is threaded only a few inches. You are going to now thread it down as far as you can go. You'll need a 10mm die with 1.0mm pitch.
Look at the photo and you'll see one piston assembled complete with the full length threading. The other is it the piston assembly apart before the threading.
Once you thread it down then clean it up and put it back together. The piston will now go in another few inches. Now just reassemble as you took it apart.
One note is that the threaded shaft now sticks out the backside much farther. Cut it off to make room and clean up the area. I'd recommend waiting to cut it off until it is back on the car.
Another suggestion while the bumper is off is to drill some major holes in the aluminum bumper. You'll never see them when the rubber cover is on, and it drops few pounds off the end of you car.
I hope this makes sense. Thanks for the tutelage Aaron!
I'd recommend starting with the rear as access is much easier. Remove the chrome bumper surround first. Three bolts each side from inside the trunk, and two in the center underneath. Then loosen or remove the rubber cover for the main bumper. Unbolt the bumper and take it off.
Now you will be left with two pistons sticking out from the back of the car. Go into the trunk and find the backside of the pistons under your carpet. You'll see a 17mm nut on both sides. Remove the nut and push out the piston shaft.
Once out you'll see another 17mm flange nut on the back of the piston assembly. Remove that nut. Finally you can unscrew the piston from its carrier by turning it out from the end where the bumper attaches.
Now you have the bare piston. You'll see that is threaded only a few inches. You are going to now thread it down as far as you can go. You'll need a 10mm die with 1.0mm pitch.
Look at the photo and you'll see one piston assembled complete with the full length threading. The other is it the piston assembly apart before the threading.
Once you thread it down then clean it up and put it back together. The piston will now go in another few inches. Now just reassemble as you took it apart.
One note is that the threaded shaft now sticks out the backside much farther. Cut it off to make room and clean up the area. I'd recommend waiting to cut it off until it is back on the car.
Another suggestion while the bumper is off is to drill some major holes in the aluminum bumper. You'll never see them when the rubber cover is on, and it drops few pounds off the end of you car.
I hope this makes sense. Thanks for the tutelage Aaron!
Last edited by creativefilmcars; 10-11-2010 at 12:43 PM. Reason: mistake
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