Thread: ZF Auto can't take Toyota 1KZ Turbodiesel ??

Originally Posted by oldturkey

Ref:"Wild Disco Transplant,Nov 11"
My mechanic says he has tried several times mating the ZF autobox to the Toyota 1KZ engine. RESULT: box destroyed in about 6 months.
Could this be due to the early torque peak of this 4cyl engine?
Having recently seen a ZF box stripped down, I was amazed at both it's complexity, and the flimsyness of the components.
I have kept the old ZF and LR transfer box in store, in the hope that one day I can restore the full time 4wd system

Was it a V8 box or TDI box as the V8 boxes dont like the vibrations and have a few other mods for a bit more longevity but I dont know how they would take the Toy mota

Is it possible to split the toyota auto from it's transfer and fit it to the LT230?

Are you guys running the 1KZ-TE? If so how are you controlling it?

A mate of mine has a 300Tdi Auto on Gas.
It has chewed 3 Trannies in 5 months, the trannie bloke here in Warragul has refused to touch it again and won't warrant any work that has been done as he reakons the gas conversion makes the engine too torquey.

More like he's not building them right

I agree. It probably keeps frying itself. The ZF's with a lot of power respond well to an additional high pressure ATF cooler. Without it I doubt very much that my tranny would still be in 1 piece (TD5 w/ ZF 4HP22EH and approx 170kw/520Nm) without the additional cooler. The higher temps play absolute havoc with them.

I'm sort of new to this idea but what's the gain from Marrying a ZF auto Trans with a Toyota 1KZ engine if you guys don't mind me asking?

Originally Posted by Disco_owner

I'm sort of new to this idea but what's the gain from Marrying a ZF auto Trans with a Toyota 1KZ engine if you guys don't mind me asking?

The gain is your Landy mates can't slag you off for not being 100% landrover and your Toyota mates can't slag off your landy.
Seriously
at:
1KZ-T

The 1KZ-T is an early version of 1KZ-TE, 2982 cc, 4 cylinders, SOHC, 2 valve per cylinder turbo diesel engine. Bore is 96 mm and stroke is 103 mm, with a compression ratio of 21.2:1. Maximum output is 125 hp (93 kW) @ 3600 rpm and maximum torque is 29.3 kgf·m (287 N·m) @ 2000 rpm.
I can't see the benefit but each to his own.

Originally Posted by Hymie

A mate of mine has a 300Tdi Auto on Gas.
It has chewed 3 Trannies in 5 months, the trannie bloke here in Warragul has refused to touch it again and won't warrant any work that has been done as he reakons the gas conversion makes the engine too torquey.

1/Is the "Trannie" you're referring to the Transfer Box or the Auto Box?

2/The Toyota 1KZ engine has problems with both.
3/When the Toyota engine And Toyota Auto box are mated to the LR Transfer box, the adaptor (male) shaft chews up the splines in the input gear.
The shaft has to be custom made, because the OE shaft is made to fit the ZF auto, and the Toyota auto has a larger output shaft.
4/I am uncertain if the custom made shaft was the correct metal (possibly too hard) or if the machining was in-accurate. I also wonder if the join between the boxes was sufficiently rigid, leading to free play?
5/ If the ZF can "take" the Toyota engine, then the above problem is solved.
Thanks for your help.
Cheers, Joe