Strange tyre wear - please help

diagram for which comment?

I had a ltle bit of wear issue in the mighty ACCO, also had a roadworthy bloke tell me my crappy shackle bushes and pins were crappy, fixed all that and found the eye on the rear right spring was busted, not obvious until I pulled the pin out (sits inside a cast cup). The combined repairs made a huge difference to steering.

Hi Jon_d, this is the one I'm not quite getting. Regards, Ash

jon_d wrote:

Sorry, just saw this thread.

Does look like axle misalignment. The inside of one and outside of the other is scrubbed; indicating it's being pushed forward while steering to the side.

If you get 2 pieces of 4 meter (straight) square tube and weld on 2 long nuts; the nuts are spaced at the rim flange distance crossing through the axle centre line.. Then screw in some all-thread to clear the body and of exactly equal length. Then butt the allthread up to the rim and measure the distance from tube to body. Measure close to the rim and then at the end of the tube. If the rim is parallel to the body, the 2 measurements will be the same.

Assuming the distances between the 2 points that have rotated (spring centre bolt) is 2400mm, and the shift is 30mm @ 4 meters. Then at 4 meters from the axle centre, the tube will be about 50mm further out from the body than at axle centre. This would equate to about 0.7* misalignment.

Ash,

Hope these help. I'm not very good at technical drawings.



Looking down showing how the bars press up against the rims. When there is zero toe, the distance between the bars at any point is equal.


Showing how the bar is supported out the front of the bus.


Showing how a laser can be added to check alignment to the rear. A tape measure is butted against the rear rim and the laser cuts the tape. The measured distance from laser to rim should be equal.

Thanks jon_d

That helps heaps for going to all that trouble.

I’ll have to get to work on it.

Thanks again. Much appreciated

Ash

You're welcome. Just be careful to get straight RHS. When I did it, they had a slight bow in one plane. I was able to use the other plane to get straight lines.

Ash,

one more drawing.

The two bars need to be perfectly parallel and the all thread length has to be precise. The easiest way to to do this is to "head and toe" them and adjust the thread length. Hence the long nuts. (with lock nuts)

Chocs a fella that was on here some years ago that is sadly no longer with us a couple of bits of square tube that slide inside each other with some locking bolts welded to them to stop them sliding
He had another couple of short bits of steel welded on each end
These clamped a Stanley knife blade
He would adjust these so the ran on a ridge of the tyre tread
Then put a mark on, say in front of axle
Spin the wheels 180 degrees and just hold the tool on the rear of the front axle

He told about 2 mm toe in was okay

I have found things along way out with just a tape measure and even getting close with a tape made a huge difference

Paul

I have an old extendable tent pole. The type that has one tube inside the other and a locking screw on the style Paul just mentioned. Can be bought at camping stores for a few dollars or just borrow the pole off your ute awning..

Here you go $21 for two. Cheap for a patented wheel alignment tool.

Mrsmackpaul wrote:

Chocs a fella that was on here some years ago that is sadly no longer with us a couple of bits of square tube that slide inside each other with some locking bolts welded to them to stop them sliding
He had another couple of short bits of steel welded on each end
These clamped a Stanley knife blade
He would adjust these so the ran on a ridge of the tyre tread
Then put a mark on, say in front of axle
Spin the wheels 180 degrees and just hold the tool on the rear of the front axle

He told about 2 mm toe in was okay

I have found things along way out with just a tape measure and even getting close with a tape made a huge difference

Paul

I've got a a similar type of gadget Paul, Only I used a couple of Old Pitchfork Tines instead of Stanley Knife Blades...!

Having said that. I Doubt that Toe-in Is the cause of Ashmenz's issue.. But I have been wrong before..

Ashmenz I'm curious to see the final outcome of this..?