Wheel alignment for the Series Land Rover requires the wheels to point inwards in order to achieve even tyre wear. For all Series I, II and III Land Rovers the horizontal distance between opposite points on the wheel rims, should be 1.2mm to 2.4mm longer behind the axle than infront of it.
If the toe-in is set incorrectly then tyre tread will be worn excessively at one edge. The method is below (source unknown, but I used it extensively whilst separated from civilization by 45 miles of corrugated road for 3 years). It works well if used carefully and with thought.
You need a STRAIGHT wooden or metal baton at least 1.5m long (the actual length is immaterial but length can improve accuracy).
With the Land Rover parked on a level smooth surface, put one end of the baton in contact with the edge of the wheel rim (see diagram) and also in contact with whatever protrudes from the wheel centre (e.g hub cap, drive flange or freewheeling hub). Carefully mark the INNER CORNER of the baton on the floor. You can fix paper to the floor, if the surface is not smooth enough to mark clearly. Repeat for the same wheel in the opposite direction and then repeat again for the opposite wheel. The important thing here is to be consistent in the way you align the baton, hence the need to keep it in contact with the centre wheel protuberance on each occasion and aligning with either the outer or inner edge of the wheel rim consistently.
The fact that you use the same baton and in the same way on each set-up eliminates the need to know it's actual length.
Carefully measure L, A and B in mm. Measurement D is the wheel size, which for your Series Land Rover, is probably 16. You need to convert this to mm (x2.54 = 406mm).
It's also a good idea to mark the baton so that you use the same face of the baton in contact with the wheel rim for each measurement. This helps eliminate any error if the baton is not perfectly straight.
Memory wasn't too sure about the formula initially, so I have derived it again from first principles. You can check the maths proof. If there are any Mathematicians with Series Land Rovers out there who can produce a more elegant solution or an alternative formula I'd be pleased to see it.
I just knew there'd be a reason one day for having to learn algebra and trigonometry at school.
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