Thread: Upgrade Stage 1 4BD1 to 4BD1-T specs?

Originally Posted by Lotz-A-Landies

Hi Guys

I was quite interested with the images of Dinty's County NA 4BD1 piston meltdown.



1/ If I want to replace my bearing caps etc, is it also possible to upgrade it to the 4BD1-T specs with oil squirters under the pistons?

2/ Is it possible to identify the block version by the casting marks?

Diana

Search noob

this has been discussed before...

1. You would need to machine/drill/tap the block to fit the squirters. It looks possible - not sure if gary did it to one of his engines or not???
The other differences are just the pistons and a few minor bits - easy to swap.

2. I am pretty sure the year of manufacture is part of the engine number (search will confirm). Factory turbos have the boss for the oil drain on the side of the block. Late model engines with alfin pistons have the boss but it is not drilled and tapped.

Thanks Ben

It takes a while to understand this search thingy. (Although I did do a search but none of the titles (that I saw on the first results page) seemed to indicate the thread was exactly what I wanted.)

Any ideas of a thread that explains all this 4BD1 squirter stuff to the ignorant and illiterate (and innumerate) like me? Thread would need to have a blackboard, pointers and a few pictures with it!

Diana

http://www.aulro.com/afvb/isuzu-land...squirters.html
http://www.aulro.com/afvb/isuzu-land...engines-4.html

Originally Posted by rijidij

The first 2 numbers at the bottom driver's side of the block indicate the year of manufacture.

The only major differences apart from the squirters were the pistons - though as mentioned later models also got alfin pistons. There are lots of minor/trivial differences between landie/civvy engines (RG, mil engines (RGB also), and the truck (NPR) variants.

(RGB designation apparently denotes the industrial engine variant)

Further info:

Originally Posted by isuzurover

Valve timing (Camshaft) changed in 1986/87 for 4BD1 and 88/89 for 4BD1T, but they BOTH changed.

e.g: in 1986, both the 4BD1 AND 4BD1T had:
Intake opens at 28 deg and closes at 62 deg
Exh opens at 70 deg and closes at 28 deg

in 1989, both the 4BD1 AND 4BD1T had:
Intake opens at 19 deg and closes at 47 deg
Exh opens at 57 deg and closes at 15 deg

The injector nozzles are THE SAME between both tha NA and T models. However the T has opening pressures the same as 1986 and earlier NA models. 1987-on, the NA models had higher opening pressures.


One last bit of info from the manual - pump timing settings:

EARLY CAM
13 / 10 deg (NA/T)

LATE CAM
16 / 15 deg (NA/T)

Originally Posted by isuzurover

http://www.aulro.com/afvb/isuzu-land...squirters.html
http://www.aulro.com/afvb/isuzu-land...engines-4.html

The only major differences apart from the squirters were the pistons - though as mentioned later models also got alfin pistons. There are lots of minor/trivial differences between landie/civvy engines (RGB ), mil engines (RGB also), and the truck (NPR) variants.

(RGB designation apparently denotes the industrial engine variant)

Further info:

Thanks Ben

Very interesting reads in those two threads, particularly the stuff on the squirters. Is Fred Smith some sort of 4BD1 parts supplier?

When you talk to people who were at JRA when the 4BD1 Stage 1 came about they comment that one of the reasons why the Isuzu engine was used, was because JRA were master distributors of Isuzu marine engines. I wonder if the LR 4BD1 is a marine variant rather than an industrial engine?

Where do people get turbo kits and manifolds for 4BD1 when they do their conversions?

Diana

Originally Posted by Lotz-A-Landies

I wonder if the LR 4BD1 is a marine variant rather than an industrial engine?

Diana

I doubt it. This is a new 4BG1 (marine engine).

You can see a huge number of differences to an automotive/industrial engine.

The LR 4BD1s could possibly be the same engine as used in marine gensets though.

Originally Posted by isuzurover

I doubt it. This is a new 4BG1 (marine engine).
(Image of 4BG1 Marine engine removed)
You can see a huge number of differences to an automotive/industrial engine.

The LR 4BD1s could possibly be the same engine as used in marine gensets though.

Yes I can obviously see the differences in the marine engine (above) the fact that it is sea blue is the big give away!

Diana

BTW I edited my post above, adding ? re Fred Smith and turbo kits

Originally Posted by Lotz-A-Landies

Where do people get turbo kits and manifolds for 4BD1 when they do their conversions?

The only off the shelf kit I am aware of is turboglide. However it is $$$$ and I have heard that some parts don't fit.

I just bought a T manifold from isuzu, a 2nd hand turbo from Evilbay, and made all the other bits myself. It is not difficult.

Ben, that's a 6BG1. Count the pipes out of the injector pump if you have to.

This is the marine UM4BG1TCX. Underneath all the marine junk it's the same shape block as our engines.