Ernest Posted December 19, 2020 Report Share Posted December 19, 2020 Hi The o/drive on my CP 6 has packed up and I am suspecting electrics or solenoid. If a new solenoid required is this an expensive job? I am thinking that if the gearbox has to come our to replace the solenoid I might as well get the gearbox overhauled at the same time. Any advice would be valued Thanks Ernest Quote Link to post Share on other sites
Nigel Triumph Posted December 19, 2020 Report Share Posted December 19, 2020 No, it's not necessary to get the gearbox and overdrive out. The H frame under the dash must be removed, then remove the gearbox cover. After that, access to the solenoid is easy. Adjustment of the solenoid push rod needs to be done accurately after the new one has been fitted, follow the instructions in the workshop manual and it's not difficult. Nigel Quote Link to post Share on other sites
SpitFireSIX Posted December 19, 2020 Report Share Posted December 19, 2020 What makes you think it is an electrical problem? Quote Link to post Share on other sites
Waldi Posted December 19, 2020 Report Share Posted December 19, 2020 Hi Ernest, I agree, first do some checks without too much work. Easiest is to check the OD relay; on my LHD car this on the lhs inner wing. See if the wire to the solenoid is energised (use the wiring diagram), and take it from there. A better description of what you have noticed is needed for better guidance. Cheers, Waldi Quote Link to post Share on other sites
Mike C Posted December 19, 2020 Report Share Posted December 19, 2020 As Nigel explained, replacing the solenoid is not a difficult job, although good quality , solenoids with the correct operating parameters are relatively expensive. If you have an A type overdrive, and assuming the oil level is correct , faulty operation is almost always due to the solenoid malfunctioning, generally caused by a problem with the switch or wiring. I fitted an indicator light on mine connected directly to the solenoid electrical feed so I can check that power is available when it should be. Quote Link to post Share on other sites
Ernest Posted December 20, 2020 Author Report Share Posted December 20, 2020 Thanks all for such helpful advice. I am thinking that it s an electrical (or solenoid) problem due to the OD working fine, then working only on 3rd and 4th, then intermittent, then packed up. When I actuate the OD 'leaver/switch' the ammeter registers a load so, given this, I am assuming a possible electrical problem from the OD itself to the power supply. Best Wishes Ernest Quote Link to post Share on other sites
Mike C Posted December 20, 2020 Report Share Posted December 20, 2020 " I am assuming a possible electrical problem from the OD itself to the power supply."- my electrical problems were so bad I installed the O/D solenoid "power on" light to check the wiring and switch under actual operating conditions. I think I've fixed all the electrical problems by now but it's still reassuring to see the light on when I switch on the O/D Quote Link to post Share on other sites
RobH Posted December 20, 2020 Report Share Posted December 20, 2020 (edited) Your description does not sound like a solenoid problem. It's difficult to envisage a fault with it which would only affect one gear and then slowly affect the others. Neither does it sound like the interlock switches for the same reason. Edited December 20, 2020 by RobH Quote Link to post Share on other sites
Mike C Posted December 20, 2020 Report Share Posted December 20, 2020 When I see the word "intermittent" I think electrical, especially Lucas electrical. From memory, 3rd and 4th have the same interlock switch on the selector shafts and maybe the switch on second went first? Unless I see my solenoid light on I assume any failure of the O/D to activate has an electrical cause. If the O/D should work in 2nd then its an A type. Maybe Ernest should start by checking the G/B oil level and if that's OK, unscrew the large brass plug and check the filter and oil for metallic particles. Quote Link to post Share on other sites
rcreweread Posted December 20, 2020 Report Share Posted December 20, 2020 I don't think we know if this is an A type or J type installation - it seems every one has assumed its an A type - perhaps Ernest could clarify Cheers Rich Quote Link to post Share on other sites
Nigel Triumph Posted December 20, 2020 Report Share Posted December 20, 2020 Ernest has said it's a CP series car, and I thought they are all A type O/D, J type coming in with CR series. I am wondering if the problem lies with the 2nd gear inhibitor switch or its wiring. Nigel Quote Link to post Share on other sites
rcreweread Posted December 20, 2020 Report Share Posted December 20, 2020 2 hours ago, rcreweread said: I don't think we know if this is an A type or J type installation - it seems every one has assumed its an A type - perhaps Ernest could clarify Cheers Rich Sorry - just noticed Ernest said it was a CP series car at the start so that should mean it's an A type. Cheers Rich Quote Link to post Share on other sites
rcreweread Posted December 20, 2020 Report Share Posted December 20, 2020 Just now, rcreweread said: Sorry - just noticed Ernest said it was a CP series car at the start so that should mean it's an A type. Cheers Rich I need to put my glasses on as I didn't see Nigel's post either - I think I'll blame Covid and go and take my vitamin D! I agree with RobH in that it's probably not a solenoid issue - sounds to me more like an internal pressure issue which probably means a rebuild although an oil level check, change and filter clean would be worth doing first. Ernest - have sent you a PM ( personal message - click on envelope icon in top right hand corner of page) Cheers Rich Quote Link to post Share on other sites
Ernest Posted December 21, 2020 Author Report Share Posted December 21, 2020 Hi all Thanks again for this additional advice - what a brilliant forum! I have replied seperately to your e.mail Rich, thanks for the offer. Looks like I should, start with the electrics - There is a record in the car's history of previous electrical issues with the o/d. Seasonal good wishes to you all. Ernest Quote Link to post Share on other sites
ntc Posted December 21, 2020 Report Share Posted December 21, 2020 Safe bet it’s the relay just because it clicks does not mean you have a good contact Quote Link to post Share on other sites
RobH Posted December 21, 2020 Report Share Posted December 21, 2020 Two faults perhaps? Faulty 2nd gear interlock switch and also iffy relay? The relay alone wouldn't just affect 2nd gear as per the symptoms described. Quote Link to post Share on other sites
rcreweread Posted December 21, 2020 Report Share Posted December 21, 2020 3 hours ago, Ernest said: Hi all Thanks again for this additional advice - what a brilliant forum! I have replied seperately to your e.mail Rich, thanks for the offer. Looks like I should, start with the electrics - There is a record in the car's history of previous electrical issues with the o/d. Seasonal good wishes to you all. Ernest Ernest - can't trace any response from you so please check and resend Cheers Rich Quote Link to post Share on other sites
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