Saturday, Mar 17, 2012 at 19:37
I had an interesting and educational experience. I had been on an outback tour using my steel wheels which I keep for off-road trips instead of the Prado's alloys.
On return I was
home in suburbia for a while and swapped the steelies out and replaced them with the OEM alloys. My next trip was all blacktop, so off I went on the alloys. I tow a 2200kg van.
To cut a long story short, the left rear wheel parted company from the Prado about 600km up the Pacific Hwy. Luckily I had felt something like a strong crosswind gust, or the buffet from a passing truck, but there was no wind and no passing trucks, so I had decided to stop and
check. Just as
well, because the wheel fell of as I was slowing at about 20kph in the
breakdown lane. Up until then I had been doing 90.
The reason?
Well, I put it down to the different contact pattern between the steelies and the alloys on the hub and dirt under the alloy that fell off.
During the outback trip there was a small accumulation of dust and grit around where the steel wheels contacted the hubs.
When I swapped the wheels over, the first one I did was the left rear. I didn't wire brush the hub, I just installed the alloy and torqued it up.
When I did the other three I thought it would be a good idea to brush the hubs and wheels, which I did, but I didn't go back to the left rear, remove it, brush it and re-install. Laziness, I guess.
As I always do after changing wheels, after about 100km I re-torqued all the wheels, including the one that later fell off. There was no untoward looseness in any whell at that point. To no avail, apparently.
What I think happened was there was a small amount of grit under LH rear wheel that allowed the nuts to loosen, even after being re-torqued and, as they say, the rest is history.
This has been a big wake-up call. I now carry a wire brush as part of my wheel-changing kit and religiously use it to clean hubs and mating surfaces of the replacement wheel.
Cheers
AnswerID:
480662
Follow Up By: Member - Frank P (NSW) - Saturday, Mar 17, 2012 at 19:38
Saturday, Mar 17, 2012 at 19:38
I have no idea why the above is centre-justified. I wrote it in Notepad, copied and pasted it.
Sorry about that.
F
FollowupID:
756094