617 Injector pump question

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mike97
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Joined: 31.07.2009
Location: South Coast UK

Hi Folks,
I have recently bought a OM 617 (non turbo) engine from a 300GD, (the engine is going into a Unimog). 
Some parts have been removed from the engine by the previous owner, I have noticed on the injector pump, at the back between the pump and block, there is a small threded hole, looks like somthing was fitted there. I can't work out what should be there, its not the fuel inlet/ outlet so I was thinking maybe a breather pipe? or something? can anyone have a quick look at pump and tell me what I'm missing?

Many thanks

Mike