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Get Overdrive out of car.

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sebastianwendt

Freshman Member
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Hi everybody,

is it possible to get just the overdrive out of the car without removing the gearbox as well ?
Is any special attention required when getting it out ?


Regards,
Sebastian
 
Yes you can do it I did it on my BJ8 , getting it back in is the tricky part .
To get it out you need to remove the seats tunnel , console and all the other stuff thats in the way . Unbolt the rear gearbox mounts , dont forget the torsion mount . Jack up the gearbox at the rear close to the OD . The engine will tilt up to the radiator , you may need to remove the fan blade to get enought tilt . Unbolt the OD and slide it out .
When it comes to putting it back in there are two things that need special attention .
You need to line up the split spline gears EXACTLY before trying to put it back on the output shaft .this can be done using a long fine tip screwdriver or a knitting needle to "feel" the splines inside the OD unit . Once they are EXACTLY lined up carefully slide the OD unit back on and you need to lift the OD pump plunger up onto the lobe on the output shaft .
DO NOT FORCE ANYTHING IT SHOULD ALL SLIDE TOGETHER EASILY . if you need to force it its more than likely the splines are not exact . Take it off and try again .
I spent a good 3hrs of time and frustration before I got it right and it slid right on all the way (then it was beer time in celebration)
AGAIN.....BE PATIENT DONT FORCE IT and good luck .
Plan on a full weekend for removal, overhaul of the OD unit and reinstall set up and testing , theres fudge time in there for beer :encouragement:
 
Are you sure the OD needs to be removed for repair ??
whats the problem with the OD ?
If you have a spare gearbox output shaft you can do a dummy run to line up the splines but if you jiggle it to much on removal then the alignment is out again .
 
Not worth the trouble, and probably faster in the long run to pull the whole transmission.

But if you're into self-inflicted punishment and abuse, by all means, go for it. Just do us all a favor, and give us the play-by-play to satisfy our perverse sense of humor and entertainment. :cheers:
 
Randy Forbes said:
Not worth the trouble, and probably faster in the long run to pull the whole transmission.

But if you're into self-inflicted punishment and abuse, by all means, go for it. Just do us all a favor, and give us the play-by-play to satisfy our perverse sense of humor and entertainment. :cheers:
Click to expand...



I Agreeeeeeee---Keoke---:applause:
 
Randy Forbes said:
Not worth the trouble, and probably faster in the long run to pull the whole transmission.

But if you're into self-inflicted punishment and abuse, by all means, go for it. Just do us all a favor, and give us the play-by-play to satisfy our perverse sense of humor and entertainment. :cheers:
Click to expand...


Its a character builder:encouragement:
 
Thanks Gentlemen !
I will give it a try on Saturday... it was already difficult to get the car onto my 2-pillar lift but we have built our own "adapter" for it...
Gonna let you know how we did and how many beers we had ;-)
 
sebastianwendt said:
One question: How did you manage do get the pressure setting right ? Did you build your own gauge for it?
Click to expand...


Yes you need a spare plug and have a freindly refrigeration technician (like me) install a schrader fitting in the plug . You can then use a 0-600psi refrigeration gauge to check the running pressure .
There is no pressure setting as such its not adjustable . The set up of the OD is the critical part . The way they tell you to do it in the book with a drill bit and line up the lever hole in the casing blah blah blah doesnt work if its old . You need to measure the lift of the ball under the pressure plug . it has to lift 3/64ths" or the OD will not engage .
Theres a thread on here somewhere about OD set up and a link to the guy who wrote it . I have rebuilt 3O/Ds and set them up using his methods and they work perfectly . use the search feature and you should find it . I posted the link so it will be easy to find .
 
Heres my modified O/D plug complete with refrigeration type schrader valve . Unscrew the cap screw on the gauge check your psi easy peasy:friendly_wink:
 
Gentlemen, do you give you some feedback on my attempt of getting the overdrive out of the car withour removing the gearbox:
it worked but it was a pain in the back... it is also pretty narrow in the tunnel with the propshaft not going back very far, ...
But it's out now and the new one from OD spares looks very good - so next step is to get it back in - but probably not this year any more...
 
sebastianwendt said:
Gentlemen, do you give you some feedback on my attempt of getting the overdrive out of the car withour removing the gearbox:it worked but it was a pain in the back... it is also pretty narrow in the tunnel with the propshaft not going back very far, ...
But it's out now and the new one from OD spares looks very good - so next step is to get it back in - but probably not this year any more...
Click to expand...

So what was wrong with the other overdrive?? and you should have just removed the propshaft to make space .
 
Hi - I didn't expect such a long shaft coming out of the gearbox ;-) Well - the overdrive looks like the home of cookie monster from sesame street. I got a replacement unit from OD spares in Rugby and will send mine back as exchange.
 
I recently had my own overdrive hit the crapper, and I pulled the trans, went with an exchange unit from Quantumechanics (as there were no "commercially available" spares for the parts I needed) and it's all back together. In fact, the Missus & I toured the neighborhoods in it tonight, looking at all the Christmas lights.

I can assure you this, I can pull and replace the transmission in its entirety quicker than you can remove/replace just the overdrive. I'd go so far as to say I could do it easier too ;)

You haven't gotten to the hard part yet... :hammer: :hammer:
 
So - Job finally done - and I also found the reason for malfunction - the cam for the oil pump had been installed the wrong way around. So the oil pump was not working at all.
It's all back together now - just need to retorque the head of the engine, re-adjust the valve clearance and then I am ready to hit the road again (weather report expects 15°C next week :-)

BTW - to adjust the splines inside the overdrive, turn it upside down. Flange for the propshaftfacing upwards, gravity will disconnect both parts and you can adjust the splines by turning the propshaft flange.
 
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