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200tdi galv chassis to replace 300??


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Slightly odd question here but I have my reasons I promise... does anyone know if I can use a 200 galv chassis to replace my poorly 300 one? Will the 200 engine mounts fit the 300 block a bit further forward to allow the 300/r380 to drop onto the older style chassis and stay in the correct 300 location? 
reason being, there’s a Cummins conversion in the pipeline which is far easier to carry out on 200tdi chassis/engine mount brackets than it is on the 300, but the conversion won’t happen until next year and I need a chassis now really. I’d like to rebuild it with the 300tdi for this winter then swap it out later. Last thing I want to do is cut the 300 chassis mounts off the galv and start welding the 200 mounts back in to suit the 5.9. Just not sure if there’s room towards the centre of the block to put the 200 mounts on to match up with the older style chassis.

thanks in advance

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200 and 300 mountings are completely different - the 300 has flat topped chassis brackets, but the 200 has them inclined at around 45 degrees.  The position of the 200 was much further aft than the 300, but the gear box and transfer box were in roughly the same spot - the engine was moved forward on the 300 to allow LR to use a single version of the R380 instead of having two versions (like the LT77, short for the Defender and predecessors, long for the Discovery and RRC).

Unless you already know the dimensions and locations for the Cummins brackets, so having them fitted along with the 300 mounts before galvanising, then it looks like you’ll have to do it the hard way and have a 300 chassis and then chop the mounts and fit new when the conversion is done.  To be honest, I suspect the Cummins mounts would be in the way of the exhaust and oil filter or cooler pipes before the conversion anyway.

As long as you clean the zinc off the area in the immediate surroundings of the welds for the new brackets, they’ll be strong, and a good coat of Galafroid or similar will protect the raw steel well - you don’t get much stone chipping in the engine bay, and the fuel and oil vapours tend to create a good rustproofing layer over the top.  If you also paint the chassis (wise to add more protection, given the high cost of a new chassis and the work, and the low cost of some paint or Schultz), then not only will it prevent any corrosion, but will hide the work too.  Just remember to spray wax inside the chassis - it should be done even with a galvanised chassis anyway, but it will cover any exposed steel where the internal galv was disrupted by the heat from welding.

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Thanks for the reply I appreciate that. I did actually convert this to 300 factory spec myself so I understand how the mounts differ in location and design etc, I guess I was just hoping to have one chassis that would work for the long term and bolt the 200 engine mounts further forward on the existing engine. 

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I have seen brackets to fit a 300 in a 200 chassis.  You can probably do the same with the Cummins to one of those chassis.  You’d need to take a close look at the Cummins to work out whether to use a 200 or 300 chassis.  Obviously, it’d be cheaper and easier for installing the current engine if you use the 300 chassis, and I’d expect that to be the more viable option for the Cummins with some custom brackets if you really don’t want to alter the chassis, but that is entirely speculative on my part.

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The available off the shelf parts for a Cummins conversion drop onto the 200 type mounts. Presumably you’re looking at a new chassis? I think if you’re thinking Cummins down the line but keeping the 300 for now, I’d make up the brackets to suit the engine from the 200 mounts on the chassis. I’m sure someone made a kit to do it years back. 

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I think it was Steve Parker who made those 300 into 200 brackets.

If someone already supplies Cummins into 200 brackets too, then it answers the whole question rather neatly!

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Trouble is if you drop the 300 onto the 200 mounting points your gearbox is going to be too far back so you'll need a stumpy R380.

Trying to mount it in the forward position off the 200 mounts is going to be such a complex fab job to make it not worth it. I think theres a reason why people dont do it this way.

I dont think you can have your cake and eat it.

Either get the Cummins now or leave the chassis until you get the Cummins.

HTH

Mo

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