A lot of This is Incomplete


Adapter for Landrover Gearbox and Perkins Prima TDi

Well I have almost finished the drawings, I have yet to plot them in 2D with dimensions, so I can use them to make the pattern from. I have some better images than these, I played with the lighting and rendering, I also animated them, so while I could have been making the pattern I played with solidworks, not very productive. amazing programme its so easy altering stuff much easier than autocad, though drawing in autocad is quicker it's a pain to make major alterations.

This part is an adapter to bolt an engine to a landrover gearbox, an adapter similar to this is used on all landrovers - I always called it a clutch housing. The Perkins Prima engine and flywheel require an adapter 61 mm deep, or so I am told.

I could alter a stock housing[~70mm deep], to fit the engine but there isn't enough meat to take 10 mm off. To cut'n'shut would mean re-machining all over and there isn't the meat in the bore - the large opening registers on the bellhousing - to do this, unless I built that up or worked with the bore as the referance for all the rest ?

I have a taxi engine adapter which would be OK - but it sat in a hedge for 20 years and the aluminium is so badly corroded that it's un-useable.

I do have a V8 adapter which would fit if bolted to a 16 mm plate, which could then be bolted to the block.

I could fabricate one from sheet. I can think of quite a few reasons, ways to avoid, spending the money on having the casting done but i am not working so i have the time for the pattern making and i am quite interested in doing some casting and if i have this cast i might get to see a mould being made - I still find it hard to belive you can make a mould with sand..

I forgot the obvious constuction method ommited above, make it from carbon fibre.....

The centre will have a 4.125" hole through it - the crank oil seal goes in it. The starter boss/mounts is now included, on the left of the adapter, the starter boss and the boss for the top two bolts to the block, are constructed like this so the pattern will pull from the sand, I have no idea how you make cores, I suspect you make a box and pack it and put the resulatnt lum of sand in the mould, so a core could be added to this pattern later, couldnt it?.

there will be 12 studs arranged around the cicumferance, thats what the bosses are for.

The reason the top bolt hole bosses[outside the bellhousing] are the full wiidth of the adapter is so the whole thing can be made in one pattern, I was going to try making a core but wasn't sure how you do it.



Some parts have a 3° and some 5° draft angle,

the weight^3 is 13.4 lbs. the overal diameter - inc bits sticking out is 19"

I will increase the draft to the max possible, though it is at at least 3° at the moment.

Well I have started on the pattern.

I bought some 18mm MDF and a router from B&Q. Mdf is grotty stuff, it was .718" thick when I got it and after a night in my garage a bit was .760. Could I have cut the shape out of one piece and added a bit of water;-)

The pattern still requires sanding and a bit of filling, I cut each layer slightly undersize so that they had to be finished when glued together.

I worked sort of to the drawing, all the dimensions are right but i made some additions where I thought it would improve the metal flow, strength or just make it easier to machine. I will take some photos of the pattern. I have put it all on a page I have repeated a lot of this I will edit it when it's all done.

Back to first page On to Page Two of the Pattern and Casting?


  Cobbled together on the 14 dec

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