Thread: Auto trans failure

Auto trans carked, saga II

Rang the repairer this afternoon, he wasn't happy. Seems I have a sump full of metal!!!!!!!!!!!!!!!!!

Now, for those in the know, if the TC is not fitted correctly into the oil pump does it bugger up straight away or could it do say 100 kilometres?

I'm guessing oil pump without knowing any detail.

It was road tested on Friday, 40-50 k, sat in the workshop over the weekend and made less that 1 kilometre yesterday morning.

I don't think I'll ring them again, I'll just wait for them to finish the job!

Oh, and what other damage might a broken oil pump cause please.

Regards

Mike

If the TC wasn't inserted fully into the trans then NO oil would be flowing anywhere inside the TC or the trans, destruction would start immediately and would be terminal very quickly.
BUT if the TC wasn't engaging the pump then it would be dry and it wouldn't drive at all, however if the TC wasn't drained then there might be enough to get it to move but once it was moving lack of fluid would bring things to a halt very quickly so I would reckon that it is more likely that there was either an incorrect job done on the rebuild or something wasn't replaced when it should have been. I'm not familiar with Landrover auto's but have mucked around with plenty of GM ones and while there may be plenty of fluid a blocked return line from the cooler will lead to fluid starvation and very quick destruction.

Theoretical knowledge....

The oil pump once truly properly broken means the tranny won't run at all - sucking eggs moment - it's the oil that makes it transfer drive, lubrication is kind of a secondary function if you know what I mean.

Ill fitted torque converter is reputed to fubar the transmission pretty much straightaway (src. Ashcrofts description).

Difficult to guess what has happened - most likely scenario is improper rebuild, bands too tight, fluff in the valve block etc. It may remain a mystery as to actual root cause as once it all goes south you could find oil pump siezed etc but no idea if before or after.

The ZF is used in a fair few vehicles, but I still feel a little worried about having anyone look at it who isn't a ZF guru. There was supposed to a place in Wingfield, but I can't remember what the result was when I contacted them a few years ago, think they just did marine stuff and weren't interested.


I'd wonder if the car was towed for any distance and speed with transfer not in neutral after initial failure as I believe this can cause a fair bit of damage (gears turning but no lube).

What was done to it? One thought there is a thrust washer that acts as a shim you can get different thicknesses it sits behind the oil pump I had to change mine when I rebuilt my trans ( still going strong ).

You ever thought of a sideline business Stevo?

well they stripped down the transmission again and found that the drum they put in broke.

Not happy Jan, just got home and read the invoice: second hand drum:, must ring up to find out why.

Ah well cheers for now, there need to be no more guesses.


Mike

surely even a second hand drum would need to be provoked to break---

Have a look what happens when a bozo in a workshop fits the oil pump gears the wrong way around, it caused my auto to fail, it held for a quite a while before it happened.
First pic shows how they fitted the oil pump gears, note the stamped dot, on the outer gear, the inner gear has a matching dot, but bozos fitted it upside down.


as_fitted.jpg


This pic is how they should have been fitted.
see dots.
dot_to_dot.jpg



Next pic shows what happens when the gear is fitted upside down, the tangs that the torque converter lock into got worn as they are at the wrong depth/not seating properly.

gouging.jpg


Next pic shows scouring in gear.

scoring.jpg

Cheers, Mario