Injection pump removal from auto TD4

Hi,
I tried to remove the injector pump from my 2005 Freelander TD4 today, but got a bit stuck trying to slacken the sprocket nut.
I can turn the nut, but it rotates the sprocket, timing chain, aux drive belt etc, basically turning the engine over. Has anyone else encountered this? I have an auto box, which was left in park when the engine was turned off, but I'm guessing the gear isn't engaged if I can turn the engine. If this is the case, how do I put it in gear without starting the engine?
Thanks

I got it loose by tapping the wrench with a hammer - inertia kept the engine still and allowed the nut to loosen.
Case closed.
I've taken a few pics of the removal process in case anyone is interested.

Gareth Lang said:

I got it loose by tapping the wrench with a hammer - inertia kept the engine still and allowed the nut to loosen.
Case closed.
I've taken a few pics of the removal process in case anyone is interested.

Click to expand...

ive got my pump on 2005 td4 ready to come off but cant get the 3rd nut underneath off, is there a knack to it or just luck?

Try asking in the correct section