Thread: Early 4BD1-T

Originally Posted by Bush65

Edit: it also has the 4BD1T oil separator for the crankcase breather.

It's just a theory of mine, but I think the external oil seperator was a necessary addition with the piston squirters. They create enough oil vapour that the simple breather setup in the likes of the non turbo 4BC2 couldn't cope.

Originally Posted by Bush65

The turbo drain is genuine - NA engines do not have the block drilled to suit the drain line. It also has a 4BD1T inlet manifold.

So although the 4BD1 block can be drilled and tapped for the 4BD1T drain, most people fitting a turbo to a 4BD1 use an easier method to add a drain line.

The cast number indicates an 85 production year.

BTW the cast '4BD1' on the left side is common to both 4BD1's and 4BD1T's.

Edit: it also has the 4BD1T oil separator for the crankcase breather.

I recall that Rovercare has a late model 4BD1 with the turbo drain (at least the boss) cast on the block.

It seems that ISUZU may have done some rationalisation of designs towards the end.

I posted the following information regarding Isuzu liners in another forum and thought it might help someone here at some time.

Originally Posted by rick130

Admittedly it's on a genset, but it's still gobsmackingly amazing.

Isuzu 4BD1_Amsoil 15w40 - Bob Is The Oil Guy

Virtually zero wear metals, it almost looks like virgin oil.
OK, it's running at a steady load, but still, these engines are bloody amazing and this one would last forever if it doesn't have some sort of catastrophic failure.

Found one yet?