bpwellington
Rover Rookie
Posts: 8 
Location: Wellington New Zealand
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Post by bpwellington on Feb 25, 2016 10:53:07 GMT
Good evening people. My overdrive solenoid has packed up so I can't engage overdrive. Took the P5 to my auto electrician and he has told me that the overdrive relay had also had its day and needs replacing. I understand that the original part is a Lucas part no. 6RA 33199E but my web search of the planet so far hasn't been fruitful. Apparently Lucas never supplied an alternative so does anyone know where I might trace one? The overdrive Solenoid I can get from Wadhams but this jolly relay is a problem. I have searched all the classic car parts sites I can find and there's plenty for MG and Jaguar but not my P5. Can anyone assist? The engine and gearbox have been completely rebuilt but now this!  ? Giving me nightmares... kind regards Bryre Parchell New Zealand |
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Post by johnwp5bcoupe on Feb 25, 2016 12:19:08 GMT
Good evening people. My overdrive solenoid has packed up so I can't engage overdrive. Took the P5 to my auto electrician and he has told me that the overdrive relay had also had its day and needs replacing. I understand that the original part is a Lucas part no. 6RA 33199E but my web search of the planet so far hasn't been fruitful. Apparently Lucas never supplied an alternative so does anyone know where I might trace one? The overdrive Solenoid I can get from Wadhams but this jolly relay is a problem. I have searched all the classic car parts sites I can find and there's plenty for MG and Jaguar but not my P5. Can anyone assist? The engine and gearbox have been completely rebuilt but now this! ? Giving me nightmares... kind regards Bryre Parchell New Zealand It's not a big job to replace with a modern relay here is a link RELAY just make sure it is not energised during reverse otherwise you will destroy the overdrive! |
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Post by Phil Nottingham on Feb 25, 2016 18:40:29 GMT
It depends on which year 3 Litre you have - its a special relay just for Rover P4's and P5's with a resistor built in and the circuits all differ - there are numerous work rounds depending on requirements
They turn up on Ebay from time to time even NOS
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Post by djm16 on Feb 28, 2016 1:53:36 GMT
I believe that a Chinese pattern solenoid for a Jaguar will fit. I found one for my P4 a year or so ago. On initial switching the full current flows through the solenoid, until the armature has reached maximum excursion, at which point the armature opens a set of contacts and the current reduces to a much smaller holding current. I cannot vouch for the resistor, I thought it was two windings on the solenoid, but I may be wrong.
If the solenoid / relay combo is not set up correctly, the armature may never reach maximum excursion even after operating the relay. The solenoid will then quickly overheat and burn out as it gets no relief from the current dropping contacts opening.
I found getting this right a hell of a fiddle.
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Post by johnwp5bcoupe on Feb 28, 2016 10:31:08 GMT
I cant see any resistor in my circuit diagrams? Mk1,1a and Mk2 are just basic switching controlled by variations of column switch, rotary switch, reverse inhibitor switch, throttle switch and kick-down depending on model.
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Post by Phil Nottingham on Feb 28, 2016 10:45:09 GMT
The resister is within the standard Lucas relay case - also Rover wiring diagrams are not the most accurate  About 15 years ago the RSR Freewheel mag had 2 part several page technical article on the complex overdrive switching which lesser rivals just managed with the solenoid + sometimes as simple single pole on/off relay. The resistor 20 Ohm? is not part of the solenoid holding on circuit either I recall. I keep meaning to look it out See Section D page 28 of the WSM as this shows the relay resistor |
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Post by johnwp5bcoupe on Feb 28, 2016 16:42:20 GMT
The resister is within the standard Lucas relay case - also Rover wiring diagrams are not the most accurate About 15 years ago the RSR Freewheel mag had 2 part several page technical article on the complex overdrive switching which lesser rivals just managed with the solenoid + sometimes as simple single pole on/off relay. The resistor 20 Ohm? is not part of the solenoid holding on circuit either I recall. I keep meaning to look it out See Section D page 28 of the WSM as this shows the relay resistor Yep found it Phil it goes to the coil and W1 then nowhere according to that diagram! as you say and I have found there are a few mistakes  I will assume it goes to earth and to do with Transient Suppression in the coil some info here INFO |
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Post by Phil Nottingham on Feb 28, 2016 17:58:58 GMT
Yes I think it earthed. The RSR article explains why all this was necessary! It was logical when I read it
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? Giving me nightmares...
