Outer Limits 4x4 Board

Can anybody please tell me how far is the optimum for advancing the injector timing on a 2.8 hilux? i.e how far should the aligning marks be moved.
Cheers, Steve.

The optimum compared to what?

How long is a piece of string?

What is the pump now set to compared to internal pump wear and engine wear and your current fuel economy performance?

Just rotate it clockwise, looking from the rear, to advance it. Do it in stages and record your results each time. Acceleration (off mark, increase from 50KPH, from 100KPH), black smoke, fuel KMS per litre, etc.

You could take it to a dyno place and do it there.

Get back to us with your results!

Timing is set internally in the pump with the pump piston travel being measured.

Moving the whole pump is not the answer.

Trains

Thanks for the info fella's, what I was mainly trying to find out was if damage could be done by advancing it a little.
I have been told but don't know if it is true that Toyota intentionally retarted the injection pump timing on these motors to make them quieter but lost efficiency by doing so.

dipmaker wrote:Thanks for the info fella's, what I was mainly trying to find out was if damage could be done by advancing it a little.

I don't think that it would cause damage. On the bad side, it may be more smoky, or could rattle a bit more or become inefficient when it comes to economy. Could go the other way too. Just remember where you started from so you can return it there if you don't like the adjustment.

I gave it a go and advanced the timing mark about three mm but all it did was rattle more and blow huge amounts of black smoke so have put it back to where it was.

in the manual it is measures in thou i think 5-20, 3mm being approx 120 though maybe move it in smaller incriments!

bigcam wrote:move it in smaller incriments!

Yep. I agree. Try 1mm increments.

It's only your time on a day off, so it's worth the try to get a nice spot.

If you can, give it a bit of retard and see what thats like for a comparison!

i would go less, like 5 thou at a time. i.e. 1/8 of a mm. the marks are very close together 1mm is a fair bit.

there is only one way to set the timing, and the procedure is in the manual (Gregorys, Ellerys, factory, etc). you NEED a dial gauge with a special adaptor, and it NEEDS to be pretty close to the factory spec - more advance will make it knock and retarding it will make it smoke and lose power.

trains, the timing IS adjusted by rotating the pump relative to the timing case, but it has to be done with the right tools.

dumbdunce wrote:there is only one way to set the timing, and the procedure is in the manual (Gregorys, Ellerys, factory, etc). you NEED a dial gauge with a special adaptor, and it NEEDS to be pretty close to the factory spec - more advance will make it knock and retarding it will make it smoke and lose power.

trains, the timing IS adjusted by rotating the pump relative to the timing case, but it has to be done with the right tools.

Hmm, I read the manual that shows its adjusted by the allen screw on the side of the pump.

I understood that with the pump being set on the bench, aligmnent with the marks when installing it would be pretty much on the money.


edited to add.
Tho if I had the gear, I would then check it and set it finally when in the vehicle.

The tools are available from fleabay to do this, just do a search for diesel tools.
Trains

I have the tools to set the timming but the mannual i have dosent give me the specs Does any one know the specs for the dial gauge that goes into the back of the pump? for a 5L??