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MG TD TF 1500 - Tow in Bar

Tow in bar.
Could one of you let me know where to buy a reasonably priced one, so I can check/redo my front end alignment. Thanks in advance.
Cheers, Barry
C B Ryley

...what is a 'tow in bar'...
gblawson(gordon- TD27667)

He means a bar placed across the front wheels to allow the wheel alignment measurement of toe-in. Moss used to sell such a thing. Bud
Bud Krueger

Harbor freight
D. Sander

I use string attached to 2 jack stands, one set for each side.
Place the stands along side the car. Have the string just barely touching the front of the rear tire, as the front track is narrower than the rear, you can use a ruler at the string to tire to check the front toe, at the front & rear of the front tires. Remember to keeep the steering wheel straight.
Len Fanelli

Hi Barry. Wih a strait plank on either side of the car you can mesure all your wheels andeven the frame for correct algnment.
Thoralf. Norway. TD4490
Thoralf Sorensen (TD4490)

Late night typing, very late. Yes the word is "TOE IN", thanks Bud and the rest of you for the information. Cheers, Barry
C B Ryley

Start with a sharpened piece of soft chalk.
Spin the wheels and touch the chuck making a mark all around on both wheels.
This will now give you the dame reverence on both sides of the tires to measure against.

Jim B.
JA Benjamin

Be cautious in using the above suggestions. Len and Thoralf's methods do not take wheel/tire lateral runout into account. On wire wheels, runout can be substantial. JA's suggestion is good if the car is on the ground and driven forward at least two revolutions of the tires, before measurements are taken.

Here is the method that I have used for years.

Checking/Setting Front Axle Toe-in

Toe-in can be easily checked on any automobile and with a little effort corrected to the required 1-mm plus or minus 1-mm or 1/32nd plus or minus 1/32nd. To complete the task you will need masking tape, a tape measure, preferably metric, a pen and an able helper.

You start by driving the car forward and backward on near level ground for at least 5 tire revolutions in each direction while fiddling with the steering wheel to ensure that the wheels are pointed straight ahead. The last step in this part of the process is to back the car to its starting point and stop the engine. Now, take your hands off of the steering wheel and have your helper push the car forward for about two tire revolutions. If the car tends to roll use the hand brake only to stop and hold the car in place.

The measurement phase consists of placing a piece of masking tape, about 2-3 inches long, at the rear of each tire. The tape should be place vertically near the center of the tire tread. Next, using your pen, place a small horizontal tick mark at the inner edge of each piece of tape. The tick marks should be as high off the ground as possible while still being able to have a clear line of sight from tick mark to tick mark. With the aid of your assistant, CAREFULLY measure the distance between the edges of the each piece of masking tape at their respective tick mark locations. Be sure that the tape measure does not touch any part of the underside of the car. Now, push the car forward, without touching the steering wheel, while carefully observing the masking tape. Stop the car, using the hand brake only, when the tick marks are as high off the ground as possible while having a clear line of sight between the tick marks. Remeasure the distance between the tape edges at their respective tick marks. Now, subtract the two measurements to obtain the toe value. If the distance measured at the rear of the tire is greater than the front, your front axle will be toed-in. It is easier to get an accurate measurement if you use the 100-mm or the 4-inch as the starting point because we are not interested in the actual distance but rather the difference between the front and rear.

This method of checking front axle toe is very accurate because you are measuring between the same two points on each tire while the points are at both the front and rear positions. Tire and wheel run out and tread pattern irregularities are accounted for.

If you find the your toe is out of specification you can make proper adjustments. Start by changing the front distance by one half of the error. Then push the car forward (never backwards) and remeasure the rear distance. Make a small toe adjustment if necessary, and repeat the entire process until you have reached the desired toe-in value. After you think that the toe is correct take the car for a short drive and repeat the measurement process.

Although time consuming, I can assure you that this toe measurement technique is at least as accurate, and more reliable than alignment shops offer. This is a direct measurement that does not rely on equipment calibration to ensure accuracy. If you want caster and camber measured/corrected or a four-wheel alignment on a modern car you must go to an alignment shop. Use the above method to check their work. You will be surprised! Have you ever noticed tire wear after 6-months of driving after an alignment, taken the car back and told that you must of hit a curb or a chuckhole. Sure…

Frank Grimaldi (retired Michelin Tire Engineer)
Frank Grimaldi

This thread was discussed between 09/09/2012 and 14/09/2012

MG TD TF 1500 index

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