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harley95

United Kingdom
26 Posts

Posted - 30 Aug 2018 :  17:49:24  Show Profile  Reply with Quote
The overdrive is not working in my Mk4 Sunbeam rapier, Iv'e checked the wire's and swoped them round on the unit still no overdrive could it be the oil ? I have put Dynolite 30s gear oil in the box could it be to thick and i should be using Castrol 10/30s?

jbailey

bigt80

United Kingdom
1009 Posts

Posted - 30 Aug 2018 :  20:59:28  Show Profile  Reply with Quote
Wrong oil shouldn't stop it working all together. You should be using 20W/50 mineral based multi-grade. I've used in mine for 130,000 miles w/o any issues (Duckhams, but Halford's classic oil is an equvalent, but any 20/50 multigrade should be OK - the green stuff is just my preference).
Low oil level can prevent proper engagement - relay may have gone, or switch. I'd start by putting proper grade oil in box; filling to correct level and then see what happens.
You don't say if it was working and then suddenly stopped, or it is a new car for you on which the o/d has never worked.
There will be other more knowledgable than me, but that's the basic stuff covered. G
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1922

United Kingdom
549 Posts

Posted - 18 Sep 2018 :  18:29:52  Show Profile  Visit 1922's Homepage  Reply with Quote
If it's the same as the later Hunter based cars you should get an audible click from a relay and from the solenoid on the side of the overdrive. If you don't get a click you have an electrical problem.

A favourite problem with mine for a while was that wires falling off the inhibitor switch on the gearbox - the one that stops overdrive being engaged unless in 3rd or 4th (I'm assuming Series 4 is similar).
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