V8 Auto - Strange Noises

My car has a type 35 box and wee had no trouble with the boss, in all it seemed a easy enough job - just as well as it might need doing again! (second hand box)
 
The earlier BW35 comes off leaving the bellhousing on the engine (as described in the Haynes manual).

The later BW65 comes off with the bellhousing making it heavier, bulkier and more awkward. That's progress!

Mike
 
I've now completely stripped the original box and cleaned loads of disgusting black sludge from the internals of the clutches, valve unit and servos. All the friction materials were in good condition with manufacturers lettering still visible, so they were washed and reassembled. The servos are easy to clean as they are just pistons in a housing.

Don't be freaked by stripping the valve unit, no matter what the Haynes manual says. Get loads of newspaper to put on the bench, kitchen towel to mop up the gooey oil, plastic sandwich bags to put the bits in and a marker pen to label the bags. Also something to wash the bits in (an oven roasting tray or washing up bowl) and some paraffin/degreaser/white spirit. An air line is useful but not essential.

Follow the instructions in the Rover manual exactly (ask/email if you want a copy) and bag and label everything as you remove it. Be meticulous. If unsure make notes/drawings, but you'll probably find bits will only fit in the right position.

Wash everything individually to clean out all the crud (use airline if available), and find somewhere clean to reassemble it. Again, follow the manual to the letter. It's not difficult, but you have to be methodical.

The whole job took about two hours and I managed to find a potential cause for the dodgy 1-2 gear shift evident for the 7 years I've had the car; the "1-2 shift piston" was sticking (sorted with fine emery paper).

A set of gaskets from David Manners for £20 (Jaguar parts are cheaper!!) and hopefully once I find a way of getting the car in the garage, I can put the old (but refurbished) box back in and get it back on the road for a lot less than the £475 quoted earlier in the thread.

Fingers crossed,
Mike
 
Problem with removing the box and leaving the bellhousing attached is that you risk damaging the seals possibly the box when you try to put the box back on the torque convertor
Fingers crossed
Dave
 
I think that risk is there irrespective of gearbox type. With the BW65, the bell housing comes off with the box, but the converter stays firmly attached to the fly wheel. You still have the problem of aligning the box with the convertor.

Mike
 
From working on Fords ,I thought you undid the 4 bolts holding the torque convertor to the flex plate , accesible through the starter motor aperture . Then drop box ,bellhousing and convertor all as one. Mind you it would be heavier that way
Dave
 
Funnily enough, yesterday after the third unsuccessful attempt at fitting the box and aligning the pump drive (not enough red wine?), I wondered if this would have been a better way of doing it. However, it went on at the fourth attempt.

The car is now back together, there are a few thing to sort out (banging exhaust etc), but the box is so smooth. Unfortunately the whine is still there in P, N and 1! To some, this might seem a lot of effort for no change, but I know the innards are clean, and I can live with it and monitor fluid regularly while I refurb the other box as a spare. What's more, I now know that autoboxes aren't as scary inside as you think.

Now the car's back on the road, I was looking forwards to a night not fixing something... then the washing machine broke!

Thanks for the suggestions/help/encouragement!

Mike
 
I would, but even cheap Bulgarian is more expensive than Dextron II at £12.50/gallon (equivalent to £2 per bottle). At least this comparison lessens the pain of having wasted 1.5 gallons in the dodgy box. That's far less than a night out!

What I don't understand though is that having stripped the box completely, found no obvious wear/damage, and having cleaned all the servos etc, what is making the noise in P, R and 1?

Apart from the exhaust banging when starting from rest, I've had a problem with alignment of the throttle mechanism. I'll start a new thread....

Mike
 
Mike

I have a box (35) which in between times I am playing with the down shift cable - the club specialist told me you can run with it off if you want just to box changes up real quick... not waht the factory manual says - however when I first fitted the box last year - straight out a scrap car (we did g et it going and check for all gears) It was really noisy until I adjusted the cable up a good bit - the manual says it affects the oil pressure in the box - only problem was that it now made another hard to describe sound when using 2-2.5K revs when crusing along.... I have backed the cable off a good bit now and the noise is back a bit but the secondary noise has gone - I'm in the middle of a respray right now but intend to fiddle more when its back together! - the box works ok just a bit noisy - and I know the only real solution is to get it fully rebuilt... perhaps your throttle mechansim problems may move the downshift cable and remove the noise
 
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