Toyota 4B engine!!

[tmarx]

There was a book about expedition travel in Africa and it had a run down on various vehicles giving the pros and cons to each one
The author claimed that the 1HZ was a redesigned 2H and not much better
Ive looked long and hard and I cant see any similarities except the they are both 4.2 litres and 6 cyl

Written by a dedicated Landrover ownerLOL

Sounds very much like something that the infamous Andrew ST Pierre White would say ...

 

[JAC83]

Sounds very much like something that the infamous Andrew ST Pierre White would say ...

Why infamous? I just got a hold of a bunch of his videos and he seems to know his stuff, at least on the videos I've seen.

 

[roscoFJ73]

Rosco,
can you remember the name of the book/author? Would be interested....

Ill take a stab in the dark and say it was in a Tom Sheppard book. I havent read it,I saw it quoted on another forum

Sounds very much like something that the infamous Andrew ST Pierre White would say ...

LOL I like his shows but his LR defender vs LC 76 series road test was a bit skewed ,or maybe he knows little about drivetrains

 

[leonelcanut]

So, do you guys know if you can use a 3B block but change all internals and head from a 4B? Cheers

 

[roscoFJ73]

A 4B is an IDI version of a 14B and has a 102 mm bore and 112 stroke and is 3.7 litre The 3B 102 mm bore and 105 mm stroke and 3.4 litre.
I guess you could do it, but I would prefer to rebuild a 4B as it has a stronger block. I don't recall anyone on this site doing anything like this , so you are in somewhat uncharted territory.
I suspect they may have different crankshafts
A lot of work to gain 300cc

 

[leonelcanut]

A 4B is an IDI version of a 14B and has a 102 mm bore and 112 stroke and is 3.7 litre The 3B 102 mm bore and 105 mm stroke and 3.4 litre.
I guess you could do it, but I would prefer to rebuild a 4B as it has a stronger block. I don't recall anyone on this site doing anything like this , so you are in somewhat uncharted territory.
I suspect they may have different crankshafts
A lot of work to gain 300cc

Well, if it could be done and if that this link says is true....the gain it is approx 50HP (seems a lot). I am not looking to gain CC but rather HP since I need to rebuild the engine anyway. Bought the car knowing the engine was not in top form and now is blowing whitish smoke when I depress the accelerator pedal
this is the link TOYOTA DYNA CARGO / KK-BU306 – JIKO TRADING - https://jikotrading.jp/toyota-dyna-cargo-kk-bu306/

 

[Greek Cruiserhead]

That's an informative link about this "obscure" Toyo engine (although I doubt too, that the outpout of 140 bhp is correct).
Thank you!

PS. I would like to add to the discussion this older S. African ad

 

[roscoFJ73]

I am not looking to gain CC but rather HP

What I am saying is 300 cc is not going to give you much horse power. Although the extra 7mm of stroke should improve the torque. These engines pull heavy loads around at city speeds using low gears.

 

[roscoFJ73]

To get a 150 hp out of a stock B diesel, you need a 15b fte which will give 153hp A 4B is the same output as 14B and is 98 HP.
A 3B is 90HP

 

[leonelcanut]

Thanks for the feedback Rosco...
So you I overhaul as a stock 3B and then add turbo and intercooler?
When I bouth the rig I knew the engine was in its last legs and now is blowing whitish smoke when I depress the accelerator pedal...have not opened the engine yet, but with 450K Km on the odometer I suspect it has much more than that and a major overhaul is due.
Have other rigs so even if it takes me a long time I want to do this once and right on the first attempt

 

[Obando44M]

Toyota B engine - Wikipedia, the free encyclopedia

"The 4B is a 3.6 (3661 cc) inline 4 eight valve OHV diesel engine. Bore is 102 mm and stroke is 112 mm."

I need help, I got the 4b 3.6cc engine and I am not able to get the combustion chambers for it. can some one help or maybe give a p number?

 

[Eurasiaoverland]

Unfortunately, in 4B engines the pre-combustion chambers were not sold as separate parts, so there is no part number and you technically would need to buy a new cylinder head, which will almost certainly no longer be available.

The 3BII uses very similar engine architecture so you could try to use those, but no guarantees. They are 11106-58020 and appear to still be available.

It happens that I have a 3BII pre combustion chamber here (used/damaged) so I can measure it if you want to compare. I've never seen a 4B engine and would like to learn more.

EDIT: I see RADD Cruisers sells aftermarket 3B pre-combustion chambers and has precise dimensions listed on their site: 3B Pre-Combustion Chamber - Toyota 3B (pre-cup) 11106-58020 - https://www.shopraddcruisers.ca/3b-pre-combustion-chamber-11106-58020.html

It also links to an Engines Australia document on cylinder head damage underlying the 'dropping' of a pre-cup and the very precise fit/protrusion required. This is most likely why Toyota decided not to sell them separately.

 

[Eurasiaoverland]

I realise it's ancient but reading through this thread, like so many others on B engines not seen in North America, there is some BS here I'll correct for posterity:

A 4B with direct injection is a 14B. Toyota adds the '1' prefix to a motor's name when it is direct injected instead of indirect. They may also add a little extra cubic capacity in some instances.

---

The B series is essentially B-2B-3B-4B-5B, with direct injected variants/developments from 3B onwards.

There is never any capacity change between e.g. B and 11B, 3B and 13B, 14B and 4B.

There is no such thing as a 5B. The B series is approximately, B - 2B - 3B - 13B - 11B - 13B-T - 14B - (BII) - (11BII) - (3BII) - 14B-T - 15B-T* - 15B-F - 15B-FT - 4B - 15B-FTE and then some spark-ignited gas-fuelled variants of the 15B. Engines in parentheses are unofficial designations for the extensively improved B, 11B and 3B engines in 1988. 15B-T was never commerically sold and is only found in military vehicles.

The 4B did not develop into the 14B, it was a later engine made specifically for the Japanese domestic market, where it was a low-emissions platform subject to tax breaks.

 

[Obando44M]

Unfortunately, in 4B engines the pre-combustion chambers were not sold as separate parts, so there is no part number and you technically would need to buy a new cylinder head, which will almost certainly no longer be available.

The 3BII uses very similar engine architecture so you could try to use those, but no guarantees. They are 11106-58020 and appear to still be available.

It happens that I have a 3BII pre combustion chamber here (used/damaged) so I can measure it if you want to compare. I've never seen a 4B engine and would like to learn more.

EDIT: I see RADD Cruisers sells aftermarket 3B pre-combustion chambers and has precise dimensions listed on their site: 3B Pre-Combustion Chamber - Toyota 3B (pre-cup) 11106-58020 - https://www.shopraddcruisers.ca/3b-pre-combustion-chamber-11106-58020.html

It also links to an Engines Australia document on cylinder head damage underlying the 'dropping' of a pre-cup and the very precise fit/protrusion required. This is most likely why Toyota decided not to sell them separately.

thanks for your answer, could you give me the measurements, I did install the 4b engine I'm my land cruiser bj70 and has been in the rage for 3 years because i am not able to find the combustion chambers. I live in Texas US and my land cruiser is in Costa Rica Central America.

 

[Obando44M]

thanks for your answer, could you give me the measurements, I did install the 4b engine I'm my land cruiser bj70 and has been in the rage for 3 years because i am not able to find the combustion chambers. I live in Texas US and my land cruiser is in Costa Rica Central America.

I mean garage for 3 years ups!!!

 

[Eurasiaoverland]

I mean garage for 3 years ups!!!

Source: 3B Pre-Combustion Chamber - Toyota 3B (pre-cup) 11106-58020 - https://www.shopraddcruisers.ca/3b-pre-combustion-chamber-11106-58020.html

 

[Obando44M]

View attachment 3846097

Source: 3B Pre-Combustion Chamber - Toyota 3B (pre-cup) 11106-58020 - https://www.shopraddcruisers.ca/3b-pre-combustion-chamber-11106-58020.html

thank you very much, I will have a friend compare the measurements for me.

 

[bj70bc]

pre cups CAN be welded in...... theyre just metal

 

[Greek Cruiserhead]

I realise it's ancient but reading through this thread, like so many others on B engines not seen in North America, there is some BS here I'll correct for posterity:

...The 4B did not develop into the 14B, it was a later engine made specifically for the Japanese domestic market, where it was a low-emissions platform subject to tax breaks.

I concur with @Eurasiaoverland, 4B engines are newer JDM engines and equipped vehicles like this Toyota Dyna (2000 vintage).

 

[Greek Cruiserhead]

A friend of mine brought two of them to Greece (direct import from Japan, see pic), but I have already purchased a good 2H for my future J45 PUP resto...