I've a Disco 300Tdi in my 90. It's mounted in the same position as the original 200Tdi engine which means that it's closer to the bulkhead than if it was a 'proper' 300Tdi 90. The end result is about an inch of clearance to get the vacuum pump out. My question is: once the vacuum pump is unbolted how far does it need to be moved from the block before it's free?