I was thinking about what my long term plan for my 60 was today, and I got the notion of finding a 4BT of some sort and doing a full rebuild for a project, with the idea of building a virtually brand new engine to put away and store until I have the money/time/dedication to either do the swap myself or send it to a shop. My idea would be to rebuild the engine, then slowly gather all the parts I would need/want for the conversion, the plan being to spread out costs. (I'm thinking 3-5 years, basically while I get myself through college then start making more money)
I've always liked the sound of diesels, but have never owned or driven one before, and this is where my hesitation to jump into this comes from. The mild to moderate gains in power over the 2F combined with the extended range and simplicity of diesel are appealing to me. I don't so much care about saving money on fuel, but I do care about being able to stay out in the mountains longer on a tank of fuel. I went through 1/2-3/4 of a tank each day up where I went camping this summer, and the big mountain passes used up a fair chunk of that just getting to and from the gas station!
Once you get her all up and running with everything hooked up, I'd like to know how different it feels from the 2F. Power wise, does it feel substantially better, or is it comparable? Also, could anyone tell me how different it is driving a diesel vs. a gasoline truck? If you havent guessed it yet, I know virtually nothing about diesel's.
I ended up reading through your thread on the 4btswaps forum while I was looking around for ideas and basic info, and WOW... you've done a hell of a lot of work with Moonshine. I never really went through your entire thread here, just bits and pieces, but I think I'm going to have to get to reading!
Thanks for reading! The thread here is significantly longer than the 4BT swaps thread, so grab some beer and set aside a couple of hours if you intend to read the whole thing. Tales of great immaturity, poor decisions and of the immense generosity of our community are all here

Sprinkled through the pages are some glimpses of maturity, good decisions and cruiser tech
1. Long plans are good. Centralize your planning around what type of vehicle will enable you to have the most fun. By type I mean FJ60 ( of course ), but SOA vs. SUA, gasoline vs. diesel, manual vs. automatic, shiny straight body or bedliner-coated and dented body. Costs can be great, but space is the absolute key element. The vast majority of this build has happened in a series of garages, shops and barns that I do not own. This build literally would not have happened were it not for the incredible people that associate themselves with TLCA sanctioned clubs. If you are going to wait to do your build ( the smart thing to do ) then buy a house with a garage ( large garage ) first. Once that's set up then buy a DD and rip your cruiser apart and build until you've built your dream.
That said, I've done the exact opposite. In college I'd literally all of my money, including beer money

, on cruiser parts to get the next project done. Now that I've done all of this work, I'm going to slow down and get myself into a house either with a shop or enough land that I can build a shop of my own. I couldn't be happier with the way I've done it as I've met some of my best friends through this and other builds.
2. She's hooked up and running now. I've been DD'ing Moonshine for about a week and a half without any complaints. I am not going to give you a good basis of comparison because in addition to the engine I also changed out the transmission, so I'm relearning how to drive this truck ( again ). I can tell you that there is a noticeable difference in usable torque and it pulls harder up to 2500rpm than my 2F did up to 3500rpm. The power curve is pretty close to the same so it drives pretty similarly, the 4BT just has more power. The 2F, at least in my eyes, was built like a diesel in terms of power and longevity, with the difference being it runs on gasoline.
3. Complexity. The 4BT is really just as complex as a desmogged 2F. They're both pushrod motors that are timed via a gearset on the front of the motor. The carb and distributor on a 2F is replaced with an injection pump and injectors on a 4BT. The injection pump seems to be about as difficult to rebuild as an Aisin carb. The 4BT needs three wires to start, the 2F a couple more than that, but relatively speaking, they are about equal complexity levels in my opinion.
When you start talking about power improvements is when the 4BT becomes a whole lot simpler. You can get crazy if you want in P&P the head, aftermarket camshaft, the works, but none of that is necessary to get 250hp out of this motor. Turn a couple of screws on the IP and you'll get up to ~150hp ( from 105hp ) for free. Change a turbo and get an aftermarket fuel pin and you should be close to 200hp. Get new injectors on top of that and you're well over 200hp. Try doing that with a 2F without spending $4k.
4. Range. This is where the 4BT excels over the 2F. I don't have my speedo hooked up yet but after driving for a week, I've burned what seems to be about 1/8 tank of fuel. With comparable driving habits and the 2F, I'd have burned 1/4 to 1/3 of a tank by now. Take that with a large grain of salt because I don't have speedo hooked up, but it seems to be more efficient to me. Long trips will become immediately cheaper as a result of a a 4BT swap. That's offset by the increased cost of the truck, but 60s are pretty cheap to come by these days anyway.
If we ever meet up I'll have you drive Moonshine so you can make a decision as to whether or not you want a 4BT.
Damn, I'm surprised that the engine didn't turn off at that low RPM. I run between 850 and 950.
I also adjust the RPM's up in the summer (almost year round) to compensate for the AC compressor kicking on.
That seems awfully high to me. I'll try the 700rpm out over the next week or so. When I turn up the fuel I'll look into adjusting the idle setting again, but this morning's drive to work was good.
Sure that's what the service manual says but many of us have bumped the idle up which has helped reduce vibs. Plus many of us are not following the service manual for fueling or timing so at this point it's really just a necessity for when you have to crack the motor open. If you'd be willing to do an experiment and bump the idle to 850+ I'm interested to hear of your results, especially with a bum injector (of course idle will rise when increasing the power screw anyways). If it sucks it's easily returned to 700.
Sorry, no memory of the bearing number but it's on the bearing itself and I think I tried calling a bearing house to see if they could find a replacement. At this point I can't remember if they could or not (potentially this is in my thread somewhere, probably in the later half but it may be faster to pull yours than look through my thread with no pic references yet). It's a deeper bearing than what we're used to.
Also true, none of the settings used are what the manual says. At 700rpm there is just the slightest shudder coming from the motor. Maybe that's because of my harmonic balancer? I'll play with the idle again next week for you.
I'll do a bit of research and post up the info on an idler bearing replacement.
The 4bt is superior to the 2f in every way, but especially fuel mileage. I'm not kidding when I say you should be able to double the fuel mileage you get now, if not more, depending on the way you tune it.
I don't know about emissions for CA, that could be a problem. You will have to ask around for that.
The rebuild is actually very easy as long as you are very careful about labeling parts and following the manual for torque specs and such. You can get an overhaul kit for around $700 that will include new pistons, rings, bearings, valve seals, gaskets, etc...
You will love the results unless you are looking for Lexus sound quality. Think skid-steer. But it's a good, diesel, loud.
I couldn't agree more with you Wyo. While the 4BT isn't for everyone, I couldn't be happier with my decision. Easy to rebuild, easy to get lots of power, very fuel efficient. I can't speak to the sound yet as my exhaust is 3' long, but it is definitely quieter than my 2F with open headers. Close in volume to the 2F, when the 2F had headers and a 2.5" system with a flowmaster 40.