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               Originally Posted by 
              djw992  
              There's a phillips-head/hex screw on the top of the housing facing upwards. Number 23 on this diagram. The drain bolt is 21. 
              https://www.fowlersparts.co.uk/parts...010-a/oil-pump  If you crack that loose half a turn whilst the engine is running oil should start to seep from it after maybe 10-15 seconds. If nothing has come out by a minute then shut the engine off. 
               
               
               
                Don't take the screw all the way out by the way, you will make a mess!
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         Now I get a correct reading from the dipstick. 
        
 It seems you only have to do this "ritual" once? 
        
 Rechecked after a couple of hours with a cold motor and the reading was still correct. 
         
        
 Did the air bleeding as well but oil started coming out after a couple of seconds so I assume it's ok. 
         
        
 Thanks so much for your help.