Thread: Torque Impulse

Originally Posted by rijidij

The flywheels are different diameters, so if you used the truck flywheel with the Landy bellhousing, the starter would not engage the ring gear. The truck bellhousing is very short and has the starter in the wrong position.

Murray

Murray - don't suppose you weighed the 2 of them when you had them like that??? The LR version looks a fair bit heavier...

Originally Posted by garryseries3

Would there be any reason why you could not use a isuzu flywheel clutch setup in between a 4BD1 and an isuzu gearbox in a landrover defender?
Kindest regards
Garry

You will be using all Isuzu clutch parts, bellhousings etc.

Originally Posted by Vern

I think you have to notch the chassis rail for the isuzu starter to clear it using the isuzu set up over the rover set up

Yes, the landrover bellhousing mounts the starter motor up higher than the Isuzu truck bellhousing. I have a direct drive starter and a notched chassis rail (notch is about 20mm off the corner).

Rijidij, I think I've finally got to the bottom of this. What your photo shows isn't just the difference between landrover and later model Isuzu parts. It's also showing early vs late Isuzu parts.
Pre 88 the isuzu clutch is 275mm and the flywheel, clutch and pressure plate match the ones you have labelled "landy".
Post 88 the isuzu clutch is 300mm, they changed to the style shown at the top.

Clear as mud?

I've just received an Isuzu industrial 4BD1 parts catalogue (thank you ebay), so I now have part number references for 8 different bellhousings, 3 different flywheels, direct drive starters in 12 and 24v etc.

Originally Posted by Dougal

I've just received an Isuzu industrial 4BD1 parts catalogue (thank you ebay), so I now have part number references for 8 different bellhousings, 3 different flywheels, direct drive starters in 12 and 24v etc.

Any chance of scanning the relevant bits and uploading (or emailing) a pdf?

Originally Posted by isuzurover

Any chance of scanning the relevant bits and uploading (or emailing) a pdf?

Yes.

But not this week.

Originally Posted by rijidij

The flywheels are different diameters, so if you used the truck flywheel with the Landy bellhousing, the starter would not engage the ring gear. The truck bellhousing is very short and has the starter in the wrong position.

Murray

Sorry I'm just being pedantic, but have you determined by measurement that the flywheel diameters are different.

To me the pics are not conclusive and the corrosion pattern on the top flywheel leads to some optical illusion effects.

Looking at the relative position of the mounting holes for the pressure plates to the outside diameter, and knowing the landie clutch is smaller, makes me suspect the diameters are probably the same.

The starter motor mounts onto the flywheel housing, and is not affected by the bell housing.

My truck engine has the low mounted 2 bolt starter that interferes with the rangie chassis. This time, instead of notching the chassis, I want modify the flange on the starter and rotate it down so that it clears the chassis.

Originally Posted by isuzurover

Murray - don't suppose you weighed the 2 of them when you had them like that??? The LR version looks a fair bit heavier...

No, I didn't think of weighing them. I wish I did now after all this talk about them.

Originally Posted by Bush65

Sorry I'm just being pedantic, but have you determined by measurement that the flywheel diameters are different.

To me the pics are not conclusive and the corrosion pattern on the top flywheel leads to some optical illusion effects.

Looking at the relative position of the mounting holes for the pressure plates to the outside diameter, and knowing the landie clutch is smaller, makes me suspect the diameters are probably the same.

I didn't actually measure them, but they are different diameters because I remember the Landy flywheel didn't fit in the truck flywheel housing.
I remember at the time thinking it was strange that the Landy flywheel was bigger, yet it has a smaller diameter clutch and pressure plate.

Murray

Originally Posted by rijidij

I didn't actually measure them, but they are different diameters because I remember the Landy flywheel didn't fit in the truck flywheel housing.
I remember at the time thinking it was strange that the Landy flywheel was bigger, yet it has a smaller diameter clutch and pressure plate.

Murray

Murray - can you measure the dimensions and weight of your truck flywheel (assuming you still have it???). I can do the same with my landie version.