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We have been running a 4JB1-T for about a year.
We installed a 4JB1-T in our 93 Classic RR LWB about a year ago. It is very very very nice to drive. We had to use a different fluid governor and torque converter rebuilt to diesel specs to get the shift points right. Lots of power and not as slow as you might imagine. Our mileage is closer to 26 or 27 mpg. It will get up to 90+ MPH.
It all started when we bought a 1983 110 with the 4JB1-T 2.8 Liter Turbo Diesel mated to the V8 ZF in 2008. It was terrible to drive because all the shift points were wrong. You had to lift you foot off the throttle to force a shift into 3rd and it would only stay in 4th over 60 MPH with less than 1/4 throttle, otherwise you dropped down to 3rd. Then when slowing down, the ZF would shift back up to 4th. Playing with the kick down adjustment helped some, but no real joy.
Then got help from a gearbox expert and friend and after a rebuild of the torque converter from V8 spec to diesel spec and a new governor it was a joy to drive. We repeated the same on our 1993 classic about a year later and "bob's your uncle".
The Isuzu 2.8 TD in our 110 was a challenge to run on WVO, but after putting in a 2 tank system and a pump to boost the WVO pressure to about 8-12 PSI (pressure varies with temp which determines how thich the WVO is), it ran fine on almost free fuel. When people would smell the exhaust and ask about the WVO, most would ask about the mileage. With a grinning smile, the answer is always the same, who cares... the fuel is almost free.
Robert Davis in VA
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