The steering relay on my 1957 ex-military Series I leaks slightly, so I’d like to try to top it up – but with what? And where does the oil pour in? If this doesn’t improve the steering, will a Series III steering relay go in?
S Arkwright, Sheffield
All steering relays, Series I to III, have the same basic shape and size, and the same number of splines. They do have a few detail differences, but they’re all interchangeable.
Earlier versions – as fitted to the Series I – have a filler hole on the side, near the top. Later ones don’t have that hole; you remove a bolt from the top and fill through that. Remove another bolt (opposite the first) to let air escape.
Trying to do the filling from the back is hard work. I use an oil can with a bit of tube pushed over the end – a piece of insulation stripped off electrical wire works. This way, you can fill from the front. It’s a bit fiddly getting the tube into position, but not too bad. Even with a bolt removed to vent air, it takes a long time for the oil to settle – just keep putting a bit in and then waiting. Keep filling until you can’t get any more in. Fill up with EP90 – and if that doesn’t improve the steering, a Series III relay will fit.