Isuzu 4bd1T in an Italian Defender 110

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Originally Posted by marcecooter

Just a question more: fitting a 4bd1t to a Land Rover 90/110 involves also gearbox relocating ?
It looks that Cummins 4bd1t Perkins 4236T and other big 4 cylinders diesel are too close to water radiator so I guess that fitting them to a standard gearbox LT77\R380\LT95 would place the engine too far from bulkhead and too close to water radiator, so I'm guessing if I'll have to relocate gearobx\transfer box a little back i the car....

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The gearbox stays in the same place, i.e. uses same mount location on chassis, and same drive/propellor shafts.

The engine mounts are in a different location however, and radiator is in the same location - the radiator is almost same as the V8 radiator except outlet in RH tank is different as it is turned up '||J' (where '||' is section through tank and 'J' is outlet pipe loking from left side).

LT77 is asking for trouble with a 4BD1T. Standard LT95 bellhousing won't fit the any of the 4BD1 flywheel housing. Australian Land Rover 4BD1 and 4BD1T have a different flywheel housing to Isuzu truck 4BD1/T engines.

The 4BD1 that was fitted to Land Rovers also has a spacer fitted in the end of the crankshaft to suit the pilot bearing bush for the LT95 or LT85. The Isuzu version uses a sealed ball bearing in the crank.

Thanks John,

Just to understand better, how is the engine far from bulkhead and radiator ?

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Originally Posted by marcecooter

Thanks John,

Just to understand better, how is the engine far from bulkhead and radiator ?

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Sorry I can't go and measure just now, however the rear surface of the flywheel housing of a 4BD1 (front mounting surface of the gearbox bell housing) is approximately in line with the front of the foot wells. The air filter housing fits in the space behind the cylinder head and the bulkhead (above the flywheel housing and gearbox bell housing)

The fan shroud behind the radiator is similar (not same) as the one used with the Rover V8 engine - the space between fan and radiator is similar to that for the V8.

If I remember I will take some measurements later today or in the morning.

Edit: the following dimensions are for the 4BD1 with Isuzu (not Land Rover) engine mounts. The length includes the Isuzu (not Land Rover) bell housing
https://www.aulro.com/afvb/images/im...14/05/1203.jpg

Hi John,

Thanks for the Info, I'll take also some measurements today, just to check the available space in the back of the engine.
i however would place the engine a little back, as fitting the air box between The engine and the bulkhead (as i already did on a supercharger+turbocharger set up I did last year) would waste 200-250 mm..

More Later
Marcello

Quote:

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Originally Posted by marcecooter

Hi John,

Thanks for the Info, I'll take also some measurements today, just to check the available space in the back of the engine.
i however would place the engine a little back, as fitting the air box between The engine and the bulkhead (as i already did on a supercharger+turbocharger set up I did last year) would waste 200-250 mm..

More Later
Marcello

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I took some measurements as per my previous posts. Note I am using a 4BD1T that came out of an Isuzu NPR59 truck. The engine is a 1989 year version and it has the stock flywheel housing and viscous fan (the flywheel housing, and AFAIK, the cooling fan are different to those used by Land Rover, so make a few mm difference in the measurements.

The rear of the flywheel housing is positioned as previously stated, i.e. approximately level with the front of the footwells - I didn't measure between the rear of the head and the bulkhead.

From the front of the viscous fan coupling and the rear surface of the radiator is between 80 and 90 mm.

The length of the engine from rear of flywheel housing and front of viscous fan is between 800 and 810 mm - my manual says this dimension is 806 mm for a 4BD1T and 795 mm for a 4BD1 - Land Rover version of 4BD1 will be slightly different again because the flywheel housing is shorter.

Regarding moving the engine back, this is something I plan to do when I get around to making different engine mounts, but only about 75 mm, as going much more will involve removal and replacement of the engine mounts on the chassis, as well as the crossmember behind the transfer case and will cause transfer lever problems for me (my transfer case is not Land Rover, and my gearbox is an Isuzu 6 speed MXA). I'm more than happy to have custom front and rear driveshafts made, and making the engine and gearbox mounts is not much of a concern to me. I believe this change to the engine position will improve weight distribution in my case, improve clearance between the engine sump and diff centre (I want to use a different diff) and allow me to drop the engine a bit to improve clearance between top of rocker cover and underside of bonnet for my intercooler.

In your case moving the engine back 200 to 250 mm will impact on clearances to the crossmember behind transfer case and seatbox depending upon what gearbox and transfer case you use. Maybe the short bellhousing kit for the R380 that Ashcroft can now supply will help. Because the chassis mounts for the 4BD1 are forward of the position used for the V8 and 2.5 L rover engines, you can utilise these to move the engine back.

When I had a 4BD1T in my bushie, I had the engine back a little over 300 mm, but I had also moved the bulkhead back.

Hi,

Please have a look at the following pictures:

300Tdi lateral side

http://inlinethumb11.webshots.com/48...600x600Q85.jpg

300Tdi's available space in the back (about 200 mm):

http://inlinethumb62.webshots.com/47...600x600Q85.jpg

and last but not the least, measuring from the back of the cylinder head to the radiator is 800 mm:

http://inlinethumb57.webshots.com/46...600x600Q85.jpg

It means that I have almost 1000 mm available in the engine bay area...or little less

Below are pics showing tape measure from the bulkhead to rear of 4BD1T cylinder head (approx 270 mm) and to front of cooling fan and rear of radiator in the engine bay of my Australian assembled 1986 110 (120 inch wheel base) tray top. Note radiator is in standard position.

https://www.aulro.com/afvb/images/im...2013/01/96.jpg

https://www.aulro.com/afvb/images/im...2013/01/97.jpg

Hi John,

It seems that you 4bd1t is shorter than my 300Tdi......:(

John, when you say the radiator is in the standard postion, do you mean for a Tdi or for the 110. I thought that the LR 110's of that era, had the Rad further forward than a Tdi defender...as in the grill is further forward than the lights etc???

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Originally Posted by uninformed

John, when you say the radiator is in the standard postion, do you mean for a Tdi or for the 110. I thought that the LR 110's of that era, had the Rad further forward than a Tdi defender...as in the grill is further forward than the lights etc???

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Only for the AirCon models :D