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Hey all,
Had my overdrive rebuilt recently( by a Healey specialist ) and it works like a champ for the first 30 or so minutes. Crisp engagement, running perfect. But, once the Healey comes up to full operating temp after 30 or so minutes with the trans/OD obviously heating up too, the engagement begins to become sluggish and then will simply not engage at all. I upped the viscosity of the oil from 30 wt non detergent to 40 wt non detergent ( some thick stuff) thinking I was loosing viscosity with the unit heating up the oil. Did make some difference ( maybe 30 versus 20 minutes) as to how long before unit would not engage so thought I might be on right track there. Have double checked the operating valve ( ball bearing, spring, actual valve) as well as replaced the ball bearing on the non return valve. Replaced the relay, new gear switch and new solenoid. Even by passed the throttle switch in case that was the culprit. Had the trans tunnel off and OD will go right into engagement with pressing down on the right side of the operating lever. Triple checked and then some the adjustment of the operating lever and it is spot on. All electrics check out and as I said, unit works perfectly when starting out for 30 minutes or so. Only when fully heated up does it become an issue. If I stop for maybe 20 minutes and start back out, OD will not engage as everything still hot. Let it cool down completely and works perfect. Have even put in Redline MT90 but made no difference so put back in the 40 wt ND. Had thought about trying to find some 50 wt non detergent oil but before I do that, any ideas ???? Have spoken to rebuilder about it and he suspects it to be an electrical issue since OD does work manually. Getting to be a real quick taking my interior out and tunnel off. Taking car back out tonight and one thing I will check again is do I get the solenoid clicking/ operating lever movement once the unit stops engaging. Keep meaning to pull over and stop so I can hear it but always forget to double check - will edit this post with results. Sorry this post is so long !
Thanks
Mike
Had my overdrive rebuilt recently( by a Healey specialist ) and it works like a champ for the first 30 or so minutes. Crisp engagement, running perfect. But, once the Healey comes up to full operating temp after 30 or so minutes with the trans/OD obviously heating up too, the engagement begins to become sluggish and then will simply not engage at all. I upped the viscosity of the oil from 30 wt non detergent to 40 wt non detergent ( some thick stuff) thinking I was loosing viscosity with the unit heating up the oil. Did make some difference ( maybe 30 versus 20 minutes) as to how long before unit would not engage so thought I might be on right track there. Have double checked the operating valve ( ball bearing, spring, actual valve) as well as replaced the ball bearing on the non return valve. Replaced the relay, new gear switch and new solenoid. Even by passed the throttle switch in case that was the culprit. Had the trans tunnel off and OD will go right into engagement with pressing down on the right side of the operating lever. Triple checked and then some the adjustment of the operating lever and it is spot on. All electrics check out and as I said, unit works perfectly when starting out for 30 minutes or so. Only when fully heated up does it become an issue. If I stop for maybe 20 minutes and start back out, OD will not engage as everything still hot. Let it cool down completely and works perfect. Have even put in Redline MT90 but made no difference so put back in the 40 wt ND. Had thought about trying to find some 50 wt non detergent oil but before I do that, any ideas ???? Have spoken to rebuilder about it and he suspects it to be an electrical issue since OD does work manually. Getting to be a real quick taking my interior out and tunnel off. Taking car back out tonight and one thing I will check again is do I get the solenoid clicking/ operating lever movement once the unit stops engaging. Keep meaning to pull over and stop so I can hear it but always forget to double check - will edit this post with results. Sorry this post is so long !
Thanks
Mike