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Kick down is accomplished in the auto box? The bit of string from the pedal goes to a crank arm on a plate by the injector pump, from the other end of which another bit of string goes off to the auto box. I suspect on a mechanical injector pump, this same bit of string is the throttle cable and controls the pump? The cruise I'm guessing a bit, there's a pneumatic actuator, might be vacuum? (same thing, different sign!) which pulls on a bit of string heading off to the aforementioned accelerator pedal. I'm not sure where it joins the pedal or the Kick down bit of string, but I believe it transmits the actuator position to the pedal and thus the throttle position potentiometer. Maybe this is not as advanced as the Fly by Wire on a TD5, more like an earlier generation, Fly by String?

Reply to
GbH
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Indeed, I get the feeling that a fair few people are talking about Discoveries in a thread asking about Defenders, and aren't coming clean!

All this guff about engine management on 300TDis seems to mostly be talking about Discoveries despite the OP wanting to know about Defenders, and they are different, as far as I'm aware the Defender never had a proper ECU on the 300TDi, just an EGR twiddler, none of this electronic pump stuff until the TD5 came along.

Were there even any Defender diesel automatics?

Reply to
Ian Rawlings

Hi guys

Again many thanks for the replies. I feel happier now, what I should be looking for for the price. And also what mileage to expect. Thanks especially for the tips on what to look for - they'll be a great help.

I'm off to see one this pm. Wish me luck.

Thanks again

Regards

Paul

Reply to
paul.rogers6

On or around Sun, 17 May 2009 09:00:53 +0100, Ian Rawlings enlightened us thusly:

Discoveries, since the Defender didn't come with an auto box. Good point, I doubt the defender ever got the electronic pump. If any manual ones did, they'd have been the very lasy few off the line. I thought it was only the autos.

Actually, I do wonder if the whole thing wasn't down to using the wrong settings in the auto box, e.g. trying to run it on a V8 one, so as to only need 1 box. I'd imagine that, on a TDi, would shift at just a bit low revs to keep it nicely on boost. But that's pure supposition - just sounds like the sort of thing that LR would do, given their record on diesel motors: "Hmm, the peak torque revs on the TDi are about the same as a V8, I reckon we can get away with the same 'box settings", without noting that the V8 will rev to 5500 quite happily if booted, and makes about 60 more BHP.

Then when it was apparent that it was a dog, chuck a differnt pump on it and get a few more ponies.

Reply to
Austin Shackles

On or around Sun, 17 May 2009 11:32:57 +0100, "GbH" enlightened us thusly:

That's about it. on a V8, the throttle cable goes to the carb linkage or injection throttle body, and a second cable is attached to the other end of the linkage which goes to the 'box.

It's possible to tweak the behaviour of the box to a slight extenmt by adjusting the latter. However, you have to ensure that the cable can never be pulled beyond the maximum inside the box - it bends and or breaks things inside.

If you remove the cable connection and pull it by hand, you can feel how it works: first it pulls against a spring, then it seems to hit a stop, then if you pull a bit more it goes click and moves about another 1/4 inch. That last bit is the full-blown kickdown. To get the maximum repsonse from the box, you need that to correspond to "pedal to the metal" in the cab, the trick is to have the usual "assistant" hold the pedal down, then adjust the cable to leve just the tiniest bit of slack in that position, so it can nevr try to pull the 'box cable past the end of the travel inside.

Reply to
Austin Shackles

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