How to fix a leaky Karcher K4 pressure washer

I am showing here how to repair a Karcher K4 pressure washer Compact (model number 1.637-311).
I tried to use it and it was leaking. This happened either because of water freezing in it, or because of a shock (when it sits upright I tend to just give it a kick so that it goes down flat so I can use it).
The pressure washer had a crack on the side of the manifold / control head.
The part that I have replaced is: “GENUINE KARCHER Control Head 9002029 9.002-029.0 - 22mm”
I found it on eBay and it was about £30.
Make sure yours is the right one based on the Karcher model number.
Once you assemble it back you need to bleed it for air or the Karcher will not start.
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