3L + turbo into LJ78- using 2LTE parts-advice needed (1 Viewer)

[simonliew]

Hi all,my LJ78 Prado overheated because a plastic Tee installed by previous owner for the circulation heater broke,loose coolant overheated n cracked the head,was going to install a Chiba head as the Toyota head are out of production or if I can find one it’s expensive.
Found a 3L and I’m looking at both engines and the 3L have no crank sensor
And I’m running the auto trans,did some searches and sone says only need the tps for auto trans to shift properly,so what’s the crank sensor for on the 2Lte Prado?
Does the tach sensor run anything else beside the tach??
I plan to use the 2lte turbo n injection on the 3L

 

[simonliew]

Hello I took the 3L injection off the engine,it’s from a 93 hiace LH117 part number 22100-5B141 and plug the part number in megazip,and it’s showing in the diagram part number 22542-54260 as a boost compensator diaphragm,so why would a 3L non turbo engine injection pump have a boost compensator??or is it the same as an altitude compensator?
Does this mean I can drop the 3L with the 3L pump into my LJ78 and use the 2LTE intake and exhaust and turbo ,and the tps on the 3L pump will run my auto trans??
And the 3L block don’t have crank sensor,what does the crank sensor do in an auto trans LJ78?

 

[simonliew]

Pic

 

[simonliew]

Pump number

 

[Eurasiaoverland]

Hi Simon

Thanks very much for posting this, I learned something today. I was going to say that what you have on the 3L pump must be a high-altitude compensator, but l ran the pump number through the database, and you are correct, it is 100% a boost compensator, the same as was used on some 2L-Ts. It seems only this high-spec model of HiAce got it, in Japan only.

Also unique to this HiAce 3L engine is a throttle body - do you have that part on the 3L engine? I'd be interested to see it.

It's not clear to me, but I believe the compensator is there as part of an emissions control system. My guess would be that it uses manifold vacuum to reduce fuelling at idle. Or maybe some connection with an EGR system? Do you have the full vacuum system on the engine?

I can't help you much on the crank position sensor. Where does it go on the 2L? I vaguely remember a spot in the 2L engine block which looked like it could be machined into a port for a sensor. Or is it in the rear timing case? Maybe I am getting confused with my 3RZ.

 

[AirheadNut]

Are you trying to put the electronic controlled injection system from the 2L-TE on the 3L, or use the mechanical 3L injection? If you stick with the mechanical injection you shouldn’t need the crank position sensor. I believe the crank position sensor is used to help adjust injection timing, but I’m not totally sure on that. There is a Denso manual floating around here that explains the electronic injection system in detail and would have the answers to your questions about that.

I’m not sure if the tach sensor runs anything other than the tach, the signal goes into the ECU, which then feeds a signal to the tachometer.

 

[simonliew]

Are you trying to put the electronic controlled injection system from the 2L-TE on the 3L, or use the mechanical 3L injection? If you stick with the mechanical injection you shouldn’t need the crank position sensor. I believe the crank position sensor is used to help adjust injection timing, but I’m not totally sure on that. There is a Denso manual floating around here that explains the electronic injection system in detail and would have the answers to your questions about that.

I’m not sure if the tach sensor runs anything other than the tach, the signal goes into the ECU, which then feeds a signal to the tachometer.

Thanks airheadnut,right now im hoping i can run the 3L injection pump,make it manual pump,as in the last picture,it liiks like the pump already have the boost copensator/or is it a altitude compensator,but ive another pump here from a 2LT,and it look exactly like the 3L pump ,boost commpensator and all,im going to use the 2LTE intake and exhaust manifold and turbo,there,s a tps on the 3L pump but im going to use the 2LTE tps and see if it will work....

 

[simonliew]

Hi Simon

Thanks very much for posting this, I learned something today. I was going to say that what you have on the 3L pump must be a high-altitude compensator, but l ran the pump number through the database, and you are correct, it is 100% a boost compensator, the same as was used on some 2L-Ts. It seems only this high-spec model of HiAce got it, in Japan only.

Also unique to this HiAce 3L engine is a throttle body - do you have that part on the 3L engine? I'd be interested to see it.

It's not clear to me, but I believe the compensator is there as part of an emissions control system. My guess would be that it uses manifold vacuum to reduce fuelling at idle. Or maybe some connection with an EGR system? Do you have the full vacuum system on the engine?

I can't help you much on the crank position sensor. Where does it go on the 2L? I vaguely remember a spot in the 2L engine block which looked like it could be machined into a port for a sensor. Or is it in the rear timing case? Maybe I am getting confused with my 3RZ.

Hi yes I took both the 3L pump and the 2LT top off and rhe compensator looks the same,the 3L pump have a more conservative aneroid rod profile,here are pics of the throttle body and the egr and vacuum,let me know if you want a closeup pic…

 

[simonliew]

Hi Simon

Thanks very much for posting this, I learned something today. I was going to say that what you have on the 3L pump must be a high-altitude compensator, but l ran the pump number through the database, and you are correct, it is 100% a boost compensator, the same as was used on some 2L-Ts. It seems only this high-spec model of HiAce got it, in Japan only.

Also unique to this HiAce 3L engine is a throttle body - do you have that part on the 3L engine? I'd be interested to see it.

It's not clear to me, but I believe the compensator is there as part of an emissions control system. My guess would be that it uses manifold vacuum to reduce fuelling at idle. Or maybe some connection with an EGR system? Do you have the full vacuum system on the engine?

I can't help you much on the crank position sensor. Where does it go on the 2L? I vaguely remember a spot in the 2L engine block which looked like it could be machined into a port for a sensor. Or is it in the rear timing case? Maybe I am getting confused with my 3RZ.

So the TPS on the 2LTE block is behind the injection,beside the left engine mount bracket,a round hole in a raised flat surface,and there’s no raised flat spot on the 3L block,and there’s 2LTE crank also have a raised spot for the crank sensor …

 

[simonliew]

Here I’ve the fuel rod from the 3L and 2LT,looks like the 2LT rod is more aggressive,I’m going to turbo the 3L,which rod should I use ?
The black tag is 3L pump,orange tag is 2LT pump

 

[TheBussman]

a 1993 3L came with a crack prone head also. Do you know if it's been replaced? 3l doesn't have oil galley in the pistons like the 2lt but I'm guessing it will be OK if you don't run it too hard.

 

[simonliew]

Prob original head

 

[simonliew]

Cleaning the engine of grease and dirt and waiting for seals and gaskets from Partsouq

 

[simonliew]

the 3L engine I got is from a 93 hiace LH107/117,and the injection pump came equipped with a boost compensator already,and I’ve another injection pump from a 2LTE,looking at both pump,they have a spring under and above the boost compensator diaphragm,unlike the 1HDT,only a spring under the diaphragm,anybody know why there’s 2 springs?and should I throw away tge top spring and get a top cover from a 1HDT with the adjustable cam?

Also I’m thinking of using the fuel pin and spring from the 2LTE in the 3L pump because it’s a turbo pin ….ideas?

 

[TheBussman]

the 3L engine I got is from a 93 hiace LH107/117,and the injection pump came equipped with a boost compensator already,and I’ve another injection pump from a 2LTE,looking at both pump,they have a spring under and above the boost compensator diaphragm,unlike the 1HDT,only a spring under the diaphragm,anybody know why there’s 2 springs?and should I throw away tge top spring and get a top cover from a 1HDT with the adjustable cam?

Also I’m thinking of using the fuel pin and spring from the 2LTE in the 3L pump because it’s a turbo pin ….ideas?

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i would use the 2lte stuff, if it smokes too much before you get on boost and you can't adjust it out the way you want then swap it out to the 3l pin.

 

[Eurasiaoverland]

Hi yes I took both the 3L pump and the 2LT top off and rhe compensator looks the same,the 3L pump have a more conservative aneroid rod profile,here are pics of the throttle body and the egr and vacuum,let me know if you want a closeup pic…

View attachment 3853946

View attachment 3853947

View attachment 3853948

Sorry for my slow reply and thanks for posting this - really interesting to see a boost compensator on a NA 3L.

According to the parts catalogue the boost pin on the two pumps you show should be identical, but clearly they are not. As the exact function of the boost compensator on the 3L pump is not clear, I would stick with using the 2L-T pin.

 

[simonliew]

So I found my little tool I used to tune my hdj81 about 16 yrs ago,it’s a pressure gauge to supply boost to the compensator,I supply 10 psi air pressure to the 3L pump with the 2LTE fuel pin and I removed the spring on top of the diaphragm,I don’t know what’s the top spring for,1HDT only have bottom spring,and pressure n release about 20 times,and I got a nice contact pattern on the fuel pin,still waiting for gaskets from megazip before I can put the engine together .

 

[BigNJpn]

This has been so eye opening. Thank you for the pictures and exploration of this swap. Hopefully dropping in a 5L in my hilux to replace my trashed 2LTE

 

[simonliew]

Finally after about 3 weeks parts arrived from megazip,it sure was a long wait,next time I’ll try Partsouq again,usually faster.
Any body know if I need the throttle position sensor to run the auto trans in the LJ78,swapping in a 3L with the 3L manual pump ,the 3L TPs is not the same as the 2LTE TPs,3L have 3 wire,2LTE 4 wires and they turn in opposite directions,and they bolt on at different places,I’m just having trouble finding the wiring diagram for the 2 tps

 

[simonliew]

Finally got the 3L+2LTE hybrid in and running,have to lift the motor up couple times as I was assuming the 3L and 2LTE rear engine plate and motor isolators are the same,2 holes on the 3L plate doesnt line up with the Prado auto trans and the 3L engine isolators will not sit on the LJ78 frame as they have this vent taps so I use the 2LTE engine mounts.