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Late model 4jb1 into 90 jackaroo

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Late model 4jb1 into 90 jackaroo

Postby gezzaroo » Tue Apr 09, 2019 8:34 am

Jackaroo's got a bottom end knock so time for a replacement motor. What are the factors to consider when replacing my original mechanical pump motor with an electric controlled 4b1. So far I think of possible mods needed: exhaust and ecu put in. Any other considerations?
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Re: Late model 4jb1 into 90 jackaroo

Postby geeves » Tue Apr 09, 2019 3:40 pm

did the 4jb1 ever have electronic control? Your biggest issue would be the electronics. You will need the computer and loom from the donor vehicle. You could go the mechanical pump way but yours will be gear drive and the new motor belt drive. Not sure if you can change the timing gear over. Whats the donor vehicle?
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: Late model 4jb1 into 90 jackaroo

Postby gezzaroo » Tue Apr 09, 2019 9:36 pm

Don't have a motor yet but all the ones Ive been looking at are from TF rodeos. All the wreckers adds on gumtree state gear driven for 4jb1 97-03.
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Re: Late model 4jb1 into 90 jackaroo

Postby paulthepilot5 » Tue Apr 09, 2019 10:57 pm

Don’t think the 4JB1’s came out with electronic injection, you might be thinking of the later 3L 4JH1. Also I believe all the Australian engines were gear driven not belt driven. I would stick with a mechanical injection pump, no worries with wiring, and a lot more options for tuning.
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Re: Late model 4jb1 into 90 jackaroo

Postby geeves » Wed Apr 10, 2019 11:56 am

that model range could be either motor mentioned above. 4jb1 will be easy as, 4jh1 is a great engine but not really a backyard conversion candidate
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: Late model 4jb1 into 90 jackaroo

Postby isuzurob » Sat Apr 13, 2019 5:26 pm

Very last of 4jb1t think 02 had electronic injector pumps only ever seen 3, rodeo engine has smaller exhaust manifold and turbo, will need to make a new exhaust dump pipe to fit your exhaust, change engine mounts and wiring loom
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Re: Late model 4jb1 into 90 jackaroo

Postby gezzaroo » Sun Apr 21, 2019 10:51 am

Ok, bought a rodeo 750 km away with about 200,000 on the clock. Just got to get it booked on a truck to bring home. Do you think I could swap the oil cooler over as to avoid having to mod my dump pipe. Are the 2 different 4jb1 oil filters the same size or would i be running under spec?
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Re: Late model 4jb1 into 90 jackaroo

Postby isuzurob » Sun Apr 21, 2019 11:02 am

Oil coolers are straight bolt on swap, need to change bottom rad steel pipe and water hoses to oil cooler, also swap exhaust manifold and turbo as your exhaust wont match the rodeo turbo, bighorn turbo is bigger
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Re: Late model 4jb1 into 90 jackaroo

Postby isuzurob » Sun Apr 21, 2019 11:04 am

Oil filter catches the rubbish in the system, the system should be clean so size shouldn't matter the filters are around the same size bit different part numbers
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Re: Late model 4jb1 into 90 jackaroo

Postby gezzaroo » Mon May 13, 2019 1:16 pm

Motor is out of the jack. Couldn't clear the diff so I removed lower sump case and oil pickup then it popped right off. To remove the engine/box/transfer out of donor rodeo I cut the rad support out but haven't lifted it out yet. To put motor back in jack I would like to just slide the gear box back about 100mm. Also, I want to buy silicone coolant lines, mainly for top and bottom hose. Any one know where to buy individual hoses instead of the whole kit?
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Re: Late model 4jb1 into 90 jackaroo

Postby geeves » Mon May 13, 2019 2:35 pm

probably cheaper to buy whole kit plus you then know you have no bad hoses
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: Late model 4jb1 into 90 jackaroo

Postby gezzaroo » Sat May 25, 2019 1:27 pm

Well the swap is all done and running well. Swapped over a heap of parts including oil cooler, turbo (rotated but no IC) and manifold, engine mounts, all the external coolant pipes, compressor, oil sensor and accelerator cable bracket and a few other bits and bobs. The pump was a little different with smaller return line and some fuel line arrangements but everything plugged in accordingly with a couple of leftover plugs due to the original CSD. Engine a bit stronger and revs to 4000 more easily. Idles on 900-1000 atm, because I put the FIAD on which needs to be adjusted some how because its restricting the acc cable to extend a little more. Still got to work out why my boost gauge aint responding as well. Also there seems to be another rocker breather line going to the dip stick. Would I still need my catch can with this in place?
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Re: Late model 4jb1 into 90 jackaroo

Postby geeves » Sat May 25, 2019 2:20 pm

good to hear. Whats FIAd? The extra drain line only helps the tappet cover drain quicker. Ive only ever seen that on 4jg2 engines but as your is a similar vintage it makes sense. Still use the catch can if the engine has any fumes. Ive never used one but my 89 bighorn only had 240k on it when tinworm got too much and my 94 is still under 250k. No measurable oil consumption so no need for the catch can
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: Late model 4jb1 into 90 jackaroo

Postby gezzaroo » Sat May 25, 2019 2:48 pm

FIAD. Fast idle actuator device. Ill keep the catch can on for now until further notice. Also got to test the oil pressure. It reads 3kg at start up. Hangs around 1-2kg during regular driving and sits just above 0kg when idling at full operating temp. This seems to be characteristic of the old motor so need to confirm with a new gauge setup as a sender unit cost as much as a vdo oil pressure kit.
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