Custom Furnace Particles Just Wont Spawn!

I've got every part of my furnace working except for the fire and smoke particles. I've copied across the vanilla furnace randomDisplayTick method and changed it to match my custom furnace, but they just wont spawn. I added a print to one of the directions and its show random numbers as it should, also the tile entity isn't throwing a null exception so it can't be related to the world variable either as that is used to access the tile entity.

Here's the method:

// Random Display Tick:
@Override
@SideOnly(Side.CLIENT)
public void randomDisplayTick(World world, int x, int y, int z, Random random) {
	TileEntityMachine tileEntity = (TileEntityMachine) world.getBlockTileEntity(x, y, z);
        if(tileEntity.isActive()) {
        	float zPos = (float)z + 0.5F;
        float yPos = (float)y + 0.0F + random.nextFloat() * 6.0F / 16.0F;
        float xPos = (float)z + 0.5F;
        float fixed = 0.52F;
        float random2 = random.nextFloat() * 0.6F - 0.3F;

        switch(tileEntity.facing) {
        	case 2:
        		world.spawnParticle("smoke", (double)(zPos + random2), (double)yPos, (double)(xPos - fixed), 0.0D, 0.0D, 0.0D);
	            world.spawnParticle("flame", (double)(zPos + random2), (double)yPos, (double)(xPos - fixed), 0.0D, 0.0D, 0.0D);
	            System.out.println(random2);
	            break;
        	case 3:
        		world.spawnParticle("smoke", (double)(zPos + random2), (double)yPos, (double)(xPos + fixed), 0.0D, 0.0D, 0.0D);
	            world.spawnParticle("flame", (double)(zPos + random2), (double)yPos, (double)(xPos + fixed), 0.0D, 0.0D, 0.0D);
	            break;
        	case 4:
        		world.spawnParticle("smoke", (double)(zPos - fixed), (double)yPos, (double)(xPos + random2), 0.0D, 0.0D, 0.0D);
	            world.spawnParticle("flame", (double)(zPos - fixed), (double)yPos, (double)(xPos + random2), 0.0D, 0.0D, 0.0D);
	            break;
        	case 5:
        		world.spawnParticle("smoke", (double)(zPos + fixed), (double)yPos, (double)(xPos + random2), 0.0D, 0.0D, 0.0D);
	            world.spawnParticle("flame", (double)(zPos + fixed), (double)yPos, (double)(xPos + random2), 0.0D, 0.0D, 0.0D);
	            break;
        }
        }
    }

And some of the random numbers that are continuously printed from case 2:

2013-02-01 18:39:04 [iNFO] [sTDOUT] 4.042685E-4

2013-02-01 18:39:04 [iNFO] [sTDOUT] -0.29456174

2013-02-01 18:39:04 [iNFO] [sTDOUT] -0.079445824

2013-02-01 18:39:05 [iNFO] [sTDOUT] 0.2750967

2013-02-01 18:39:05 [iNFO] [sTDOUT] 0.16858378

2013-02-01 18:39:05 [iNFO] [sTDOUT] -0.14373022