Box issues

N

Nickthelomas

New Member
Ok, so i have issues, to many to list so I'll just stick to my rover. It is a 1969 p6, originally fitted with a bw35 but the previous owner tried to do a skid and exploded the planetary gears, so I replaced it with a bw65 out of my parts car (which is complete and rego alive if any one needs parts) the gearbox started out making a whistling perrrrp noise from 1st to second, at first it was short and sharp, slowly it got longer and introduced a shudder then almost not even getting to second, I did an oil change with the correct ATF mentioned on this forum with no affect, with nothing to loose I added some Lucas stop slip, I am an apprentice mechanic and have had cars come in with no reverse and struggling in drive and this additive has fixed all that so I was hoping for the best but no fix, I then tried an oil flush but using dextron ATF, not recommended but I did it anyway, no fix, I then removed sump and inspected filter, it wasn't blocked (witch disappointed me) but did have a couple little tags no bigger then a notch of a key of copper in it, also some silicone, this is where I have left things as obviously the filter wasn't blocked, my first impression of the noise was maybe blocked filter or incorrect level and drawing air, but I'm starting to think the noise I'm hearing is a clutch slipping, maybe? I'm running out of ideas short of an overhaul, I'm not 100% the ATF I used was what was recommended on this site as it was given to me by previous owner and I turns out a lot he hast told me isn't true, so I will be purchasing correct oil my self but while sump is off I'm hoping that'll be the last suggestion to fix my problem, in my time I've learnt if its to good to be true, it is. And I have checked oil level several times before anything else using Harveys procedure, to be honest I kinda no what needs be done and expecting to hear it from you all, but grasping at straws I'm hoping someone has been there seen it all before and says "it's that just do this rookie" but like I sed if it's to good to be true. Appreciate all feed back,
Ps been hanging round this forum for a long time, love it and long live Harvey!
 
Hi Nick

Well first off welcome to the forum and great first post! We appreciate a bit of humour here. And you know you're going to have to upload some pictures too, don't you! It helps the rest of us lots if you can put where you're from in the signature panel - do I detect another member from down under - or have you been watching too many Ausie soaps on the box?

Harvey will be along in a moment I'm sure. Sounds like you're going to need to know where to buy Borg Warner bits as well though :(

Chris
 
Haha thanks for the welcome, I don't consider my self new I just been lurking around in the shadows, haha. I'm down under the down under, from new zealand.
I look forward to Harvey comming along for the ride.
 
Welcome - recently Harvey suggested that whistling was likely to be air in the system. Mine making noises like that ended up being more involved than that though!
 
It's being roconditioned at the moment. You really need to wait for Harvey before coming to any conclusion though. He really is 'da man' on this.
 
Yeah cool, I'll be waiting. Let me now what they sed it was if u get the information out of them, I will most prolly be overhauling my bw65 what ever it ends up being just for the experience and piece of mind.
 
Just hada brain wave, scary but true. Could it be a servo struggling? If so will the the 35 servos go strate in to the 65?
 
If it's judder as it changes into SECOND, and apart from it being a bit noisy that's the only fault, you could check the front band adjustment (while your're there you may as well set the rear one as well). Servos on the 65 are built into the casing, so 35 box ones won't fit, but 65 box servos can be resealed in-situ. The noise could be the pickup pipe "O" ring failed, but that aerates the fluid making it all pink and frothy. If it judders in all forward gears it's the front clutch, assuming that you're not running with the kickdown cable disconnected. Finding bits of copper, and especially bits of silicone, is never a good sign.
If you can roadtest it, and be a little more specific about what it does, and when, then I can pin the problem down a lot more easily.
 
Thanks for the reply. Ok, so only from 1st to second wen the change happens, Not wen releasing first but engaging second I get perrrrp noise, and the shudder, no other gears do this.
Were you saying it is servos? And what is the correct band adjustment? I have a work shop manual but on with the 35 in it, and even in there finding information on the bands is very vague, not sure that's spelt write.
 
SECOND gear applies the front band, so it could be the band needs adjusting, or the servo is faulty and not applying enough pressure to clamp and immediately stop the drum. If it was me I would do a SECOND gear start (selector in "2" and pull away from rest) and see whether you get slip or judder then, just to confirm the source of the problem as the front band.

To adjust the bands (the procedure is the same for both) Slacken locknut, make sure adjuster is free to move in the casing, torque adjuster to 5lbf ft, and back off 3/4 of a turn, tighten locknut without moving the adjuster.
 
Awesome thanks, befor I put it up on axel stands there is quite a steep hill befor my road it was doing a lot of shuddering and perrrping so it's safe to say the more load the werse it is and to make it up the hil I went from D to 2 which didn't stop it, but in to l it got up the hill no issues.
 
It does sound like a front band problem then. All you need to hope now is that it's the adjustment, or the servo seals, and not the band itself delaminating.
 
Thanks a lot Harvey, if it's not to much trouble could u give me a run down to the general location of the front band, it's adjustment and anything I may also need to no about doing it?
 
Both of the 65 box band adjusters are external, front one on the N/S of the box, rear one on the O/S.
(35 boxes have an external rear band adjuster and an internal front one, or a self adjusting front band).

There's not anything I can think to add to what I've said already as regards doing it, but you may find it helpful to look at the illustrations in the WM. And you'll need a very low reading torque wrench.
 
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