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Update on BN2 overdrive problem
Hey all,
I had a thread in here a couple of months ago about how my overdrive would work beautifully when first starting out but once fully warmed up after 20+ minutes, would no longer engage or would simply disengage. It was rebuilt by Healey Surgeons and worked fine on the bench test but obviously Bruce could not test it in the car as I shipped it to him from SC. I have tried everything to get this problem resolved and appreciate a lot of help from Andrea, our Italian poster and Healey owner, in trying to walk me through this issue. Here is what I have tired-
* replaced ball bearings and springs on both operating valve and pump valve
* started off using 30 wt non detergent oil, now using 40 wt non detergent
Many of you have seen the excellent articles on trouble shooting the A type overdrive from Buckeye Triumph club - have followed their recommendations and added washers to the
accumulator spring ( have later smaller one) to increase operating pressure as main issue was lack of operating pressure in trouble shooting article.With old spring and two washers got it up to 400 pounds. Decided to purchase a new spring from Moss who sources it from AH Spares in UK. Using a 600 pound pressure gauge with adapter screwed into operating valve plug hole.
* two washers and new spring resulted in the pressure going past 600 pound mark so shut it down and took apart again
* no washers and new spring gave me 490 - 500 pounds but problem of going out of overdrive after fully warm still did not stop
* added one washer and pressure got up to 550 pounds and OD again works perfect when cold but once fully warmed up but now maybe 30 minutes, OD stops working. Know 550 pounds is on high side but pressure drops off perfectly when OD engaged and comes right back up. Works perfect until heated up.
All electrics have been replaced including solenoid, gear switch and relay. If I stop when problem occurs and shut down engine, can hear solenoid activating so electrics still working when hot.
This problem has me and others stumped. Anyone have any other ideas ?????
Thanks,
Mike
Hey all,
I had a thread in here a couple of months ago about how my overdrive would work beautifully when first starting out but once fully warmed up after 20+ minutes, would no longer engage or would simply disengage. It was rebuilt by Healey Surgeons and worked fine on the bench test but obviously Bruce could not test it in the car as I shipped it to him from SC. I have tried everything to get this problem resolved and appreciate a lot of help from Andrea, our Italian poster and Healey owner, in trying to walk me through this issue. Here is what I have tired-
* replaced ball bearings and springs on both operating valve and pump valve
* started off using 30 wt non detergent oil, now using 40 wt non detergent
Many of you have seen the excellent articles on trouble shooting the A type overdrive from Buckeye Triumph club - have followed their recommendations and added washers to the
accumulator spring ( have later smaller one) to increase operating pressure as main issue was lack of operating pressure in trouble shooting article.With old spring and two washers got it up to 400 pounds. Decided to purchase a new spring from Moss who sources it from AH Spares in UK. Using a 600 pound pressure gauge with adapter screwed into operating valve plug hole.
* two washers and new spring resulted in the pressure going past 600 pound mark so shut it down and took apart again
* no washers and new spring gave me 490 - 500 pounds but problem of going out of overdrive after fully warm still did not stop
* added one washer and pressure got up to 550 pounds and OD again works perfect when cold but once fully warmed up but now maybe 30 minutes, OD stops working. Know 550 pounds is on high side but pressure drops off perfectly when OD engaged and comes right back up. Works perfect until heated up.
All electrics have been replaced including solenoid, gear switch and relay. If I stop when problem occurs and shut down engine, can hear solenoid activating so electrics still working when hot.
This problem has me and others stumped. Anyone have any other ideas ?????
Thanks,
Mike
Seriously, why don't you try giving John at Quantum Mechanics a call: 
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