Is this a toe-in issue?
Not usually toe in.
Try the car on a level surface such as a parking lot. Most roads have a high crown in the center and slope down to the right. You want to see how it pulls on level ground first.
Check to be sure both front and rear axles are centered in the frame. The center bolt through the spring leaves should be in the hole in the center of the frame crossmembers. The car should set close to level when parked on a level surface.
If all those things check out, the castor and camber could be out of alignment. If one side is significantly different than the other it could cause the car to pull to one side.
See the Owners manual for specifications for your particular car. The earlier cars are different from the last two years.
Toe in could aggravate pulling to one side or the other, but more likely it is a bent _______________ (axle, wishbone, engine pan, frame)
At the risk of sounding too basic, ensure that all inner tubes are inflated to proper psi, which varies from clinchers (55psi) to demountables and wire wheels (34-36psi). An underinflated tire will definitely pull to that side, especially if on the front. Some of the best antique car guys have overlooked this simple cause of pulling to one side or the other.
Marshall suggest a good place to start. I have been working on a 23 touring that was pulling to the right. the front passenger side tire looked a little low but when I got to the shop to add air it was about 20 lbs in that tire.
I hope it's simple! I will check the easy stuff first
Our '27 pulled to the right until I figured out that it had a wrong spindle on the right, giving it more camber that the left.
Never underestimate the effect that tyres have on this issue. You could also try swapping the front wheels left to right. Alan
Just get it on a flat surface and eye ball everything. You never know what'll turn up.
I added air to tires to 55 psi all the way around...it really helps. Will go to the hs school parking lot today and check out more. Need to check toe-in as well.
Another cause of pulling is a car with the wrong spindle (having the opposite threads on it) will sometimes have the wheel bearing tighten up while driving - I've seen these get so bad so quickly as to break the spindle when the wheel stops spinning...