Thread: ZF4HP22 do it yourself overhaul

And here is some more info on the A clutch mod using Teflon seals this is from a BMW site so enter the following into google, bmw e32 zf4hp22 4 speed automatic transmission rebuild.

there is mention that a small hole is drilled into the A clutch piston in a bleed and dump system, I am not keen on this part as robbing oil supply/ pressure from other parts of transmission.

Will just stick with the Teflon seal replacement hope to be starting on the rebuild towards end of October.

Ok will be starting the strip down in the next few days hoping to have the engine and trans out on Monday tomorrow will be making up some benches on trestles to lay the parts side by side.

Have mounted the BMW trans on my engine stand ready to pull apart

image.jpgTransmission is out flex plate is pushed back a bit makes me think maybe stack height was wrong but will know more tomorrow, a couple of pics let me know if this is normal one of the flex plate and one of front of torque converter

Front of torque converter, also how do you put up multiple pics on the one post?? I only seem to be able to manage one at a time

Hi stevo flex plate definitely not normal , I'd say you'd be right about the stack height, some #&*% must have previously pulled the box up with bell housing bolts , better have a good look at the oil pump, , torque converter looks OK ( on the bit I can see but you will be getting it serviced anyway I'd imagine)

I have owned the car from near new bought it with 20K on odometer now has 270K box has never been out maybe something to do with the box failure or a Friday rush job at factory because someone was shouting beers at the local??


I am getting a modified torque convertor hopefully will have both trans stripped by tomorrow night will be working late if needed I will take pics as I go along.


Still have to strip my transfer case to anyone know bearing numbers?? and fix oil leaks on engine and get it going by next weekend to start another job on a construction site.

Originally Posted by stevo

I have owned the car from near new bought it with 20K on odometer now has 270K box has never been out maybe something to do with the box failure or a Friday rush job at factory because someone was shouting beers at the local??

.

Only other thing that can cause the flex plate to do that is if the auto gets very hot and t/c expands and forces the flex plate to bend

Originally Posted by stevo

Front of torque converter, also how do you put up multiple pics on the one post?? I only seem to be able to manage one at a time

stevo,
there are a few different ways depending on where the original is, you can try cut and paste if the image is small, scrolling down the page you use to REPLY to a post, you see "manage attachments"
add up to 5 pics,
upload,
close box,
submit reply.