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[midnightmower]

My 1999 2.6 had a leak at the back of the left (passenger side) cylinder head which was damaging the dis, 2 in fact. I pressureized the cooling system and could see a spurt. I believe the the head gasket has failed near a waterway. I needed to top up the reservoir at least every few weeks. I have inserted 1 bottle of K Seal which has stopped the leak since April 2011. K Seal was specifically developed for the leaking head gasket in the Rover K series engine which I also have.  The Rover engine had a slight leak and after months of searching neither my garage or I could identify where it arose.  This was years ago and I still have a leak free Rver engine!
Hope this helps
Paul

[Varche]

Something else to check while you have the scuttle off.

I had a pinhole leak in the rubber tube , just after the clip, that leads from the back of the engine to the HBV. I would recommend changing that pipe if you have to change your HBV. It is a beggar to do but must get a lot of grief down their from vibration and heat and oil mist

[amba]

Agree with Varche.

I found the spring pipe clip on the pipe from the coolant bridge to HBV had caused the pipe to wear ,probably due to movement when replacing hbv on previous jobs.

Pipe is less tha £10 from dealers and whilst you have it to bits is easier to do. ...also recommend replacing coolant bridge washers x4 as again easier access when pulled apart and little cost.

All of the above are potential causes of leaks