How do you know if your car needs a steering box overhaul?

How do you know if your car needs a steering box overhaul?

#32 of 37


This is a question we are often asked by owners who are having trouble with the steering on their car. If the car is physically hard to steer and driving is a tiring experience, or the steering does not self-centre you may wish to rule out a number of possible causes.

The first thing to check is that the kingpins are in good order and everything is properly lubricated. If the steering is still stiff and sticky then you may need a new steering worm and nut fitted. To read more about steering box overhauls click here.

We are now manufacturing new steering worms and nuts for both the right hand drive and left hand drive Phantom 1 chassis. This means we can overhaul steering boxes on the following cars fitted with Rolls-Royce steering boxes:

Bentley 3 1/2L, Bentley 4 1/4L, Rolls-Royce 20hp (except early models), 20/25, Phantom 1 and Phantom 2.

Marles steering box
The Bentley 4.25L M series and Rolls-Royce 25/30, Wraith and Phantom 3 were all fitted with Marles steering boxes. The later Marles steering box was considered to be a significant improvement over the Rolls-Royce box. However many of these are now in need of attention, with the development of excessive internal free play. Using replacement parts which we have manufactured the majority of Marles boxes can be returned to original condition.

The Marles steering box is designed to have no free play within the box in the straight-ahead position, and for about a quarter of a turn of the steering wheel on either side of this position. Beyond these limits there should be free play within the box, and on full lock the play is appreciable. This is by design and should not be a cause for concern.

If there is free play in the straight-ahead position this cannot be overcome by adjustment and the steering box is in need of overhaul.

If you are concerned about your car’s steering please do not hesitate to contact us to discuss how we can help.