Thread: 4BD1T - set for oil drain etc

Originally Posted by 1103.9TDI

Thanks Dave, but I thought the Donaldson filters were overkill...capacity wise, they certainly look it, compared to most other filters of similar sized 4x4 diesels.

Going from memory, and without digging out my Donaldson technical manual, I think Donaldson filter recommendations are sized to give full flow at 80% clogged.

Originally Posted by Dougal

Those who are scared of change, will never find the benefits associated with it.
These engines were built 20 years ago, designed earlier than that. Turbos have changed significantly in that time and Isuzu never cared about landrovers when they were drawing this engine up either.

Our requirements are different, so the solution we each arrive at is different too. That's why I'm putting a variable vane turbo on mine shortly.

I understand that and will enjoy reading what you have to say about the results of newer turbos.

What I'm trying to say though is Isuzu have a spot for oil drain back, there's a spot for oil supply, there is a spot for supply and return coolant. It's all there, so why bodgi up your engine when Isuzu have already designed the points and parts to assist with adding a turbo.

larns do you have the part no for the oil pick up discribed by John, between the filter and oil cooler.

I would like to drain oil back the same way as a 4bd1T. How did you do it when you converted your n/a motor?

Also, what turbo manifold do you have.

Finally what size air to air intercooler is required for this size motor?

thanks

Originally Posted by Larns

I understand that and will enjoy reading what you have to say about the results of newer turbos.

What I'm trying to say though is Isuzu have a spot for oil drain back, there's a spot for oil supply, there is a spot for supply and return coolant. It's all there, so why bodgi up your engine when Isuzu have already designed the points and parts to assist with adding a turbo.

but aren't all those oil supply/return points on the inlet side of the engine? I ran my oil drain on the shortest possible route back to the engine i could find with the biggest size tube i could fit - 20mm i think.


Andy

Originally Posted by andrew e

but aren't all those oil supply/return points on the inlet side of the engine? I ran my oil drain on the shortest possible route back to the engine i could find with the biggest size tube i could fit - 20mm i think.


Andy

Oil supply on my 4BD1T turbo comes from the distribution block at the rear end of the oil cooler. Yes it's the intake side of the engine.

That oil line has twice oiled my firewall and once mortally wounded a turbo. I rebuilt that turbo myself and today am embarking on a 6 hour remote drive to test it.
Wish me luck.

Here are some pics taken of the turbo oil and water lines on a stock 4BD1-T from an Isuzu truck. The turbo was Garrett and didn't have a wastegate.

Oil feed from fitting at inlet of oil cooler. Oil return into crankcase below turbo. Water feed from thermostat housing. Water return at inlet of water pump.

thanks very much John that helps a lot.

The thermo housing and water feed is very different from mine. The water return would be difficult as it means replacing the housing (or possibly putting in a T in the radiator return hose).

The oil feed is just replacing that small mounting plate/block with 2 bolds. The oil return also looks easy just replacing a plate held by 2 bolts with a plate with a 90degree bend. Maybe this is the plate justin was talking about.