Thread: 4BD1T Swap from Isuzu NPR

Originally Posted by TonyC

By tunnel I assume he means the sheet metal hump/floor/cut out in the firewall,, part of the body work that covers the bell housing/gearbox/transfer case.
Not any part of the mechanical drive line.

Tony

Correct, it's what we call it in the States so I'm realizing I might not be using the right terminology here. I'll try to tone down my American-isms

OK, got it. Good pickup TonyC. My bad.

I think of the fire wall as a flat structural element, with a cut out doorway between the engine bay and the cab. Any sheet metal attached to the fire wall and back into the cab along the floor I view as transmission tunnel cowling, Others may think differently and I don't know how manufactures define things.

I would have asked something like given the original was an LT77 box and bell housing do I have to alter the firewall or transmission cowling in any way to fit the Isuzu bell housing and gearbox. All is forgiven if you undertake to give free board and lodgings to any of us visiting the US. And we could talk politics...although I'm feeling a bit sleepy from all of this writing...don't forget, Congress has just made voting compulsory, a preferential system, booths open on Saturday instead of the middle of the working week, the third wheel of president has been abolished...oops...sorry, nodded off there for a second.

Now that I'm wide awake again, I don't recall anyone discussing the need to hack the Defender firewall to get clearance for the Isuzu bell housing so never occurred to me that this was what was being referred to. Could be wrong and may have been done.

It seems most transplants involving the Isuzu bell housing are for the older Defender models, other older vehicles such as the Range Rover and D1 and D2. Given your talking LT77 I'm guessing your Defender is pre year 2000.

Mine went into a Range Rover from the 1980's and no problem with the fire wall. In fact about 90% of the bell housing is on the passenger side of the firewall, covered by transmission tunnel cowling.

Don't know how much, if any, of the firewall and cowling changed between Series and Defender. Had a look at my Series III Stage 1 naturally aspirated 4BD1T. In this case about 80%t of the (Rover?) bell housing is on the engine bay side of the firewall. Given the turbo and naturally aspirated 4BD1 are the same dimension then I would judge there is plenty of room for the Isuzu bell housing if no change between vehicle models. The (Rover?) bell housing seems to taper rapidly as it approaches and passes through the firewall. Defender owners might chime in with better info, One, Vern, originally went Range Rover, then Defender, not sure what he is driving now.

I have occasionally wondered through TeriAnne Wakeman's Rover site. On diesel engines, not sure when last updated, maybe 2017, she talks at the bottom of the page of 'the 2.7 liter five cylinder turbo diesel that is in the dodge sprinter UPS Trucks'. Given it any thought? Converting a Series Land Rover to diesel

Your right about the bellhousing being mostly forward of the firewall.
The factory fit 4DB1 has a large air cleaner between the back of the block and the firewall, so the motor is well forward in the engine bay.

Tony

Originally Posted by TheVolunteers

Correct, it's what we call it in the States so I'm realizing I might not be using the right terminology here. I'll try to tone down my American-isms

That's what I would have called it, and I generally get cranky about American-isms in Australian language, so don't start referring to Disco 4s as a LR4 🙂

Tony

Originally Posted by TonyC

That's what I would have called it, and I generally get cranky about American-isms in Australian language, so don't start referring to Disco 4s as a LR4 🙂

Tony

Haha noted, I guess we adopted that nomenclature after the terrible reliability reputation of the disco 1 and 2 (we never imported the diesel so we only had the V8s) so Land Rover tried to rebrand the line in North America with the release of the LR3 (Disco 3 to the rest of the world) to boost sales. I always thought the "LR" moniker was pretty weak, discovery was always better.

I am happy to join the group. Can you help me with this part to get its number or location, because it was previously used to swap for a Range Rover P38. This part is from an Isuzu 4BD1. Someone should have posted it in the forum, but I did not understand what this part is and I did not find it. However, no one responded to us.

Originally Posted by Gonish

I am happy to join the group. Can you help me with this part to get its number or location, because it was previously used to swap for a Range Rover P38. This part is from an Isuzu 4BD1. Someone should have posted it in the forum, but I did not understand what this part is and I did not find it. However, no one responded to us.

What part are you after?
I've never heard of 4DB1 in P38A, not that means it's never been done.

Tony

Originally Posted by TonyC

What part are you after?
I've never heard of 4DB1 in P38A, not that means it's never been done.

Tony

Hey Tony, Can you help me with this part to get its number or location, because it was previously used to swap for a Range Rover P38. This part is from an Isuzu 4BD1. One of the men posted it in the forum, but we were unable to contact him in the Holden forum.
I will show you some pictures:

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