Coolant loss and over pressure

[SimonA]

I've an ancient BMC Diesel engine which was totally rebuilt five years ago. It starts fine (no compression problems) but is showing what I think might be head gasket or warped head symptoms. The coolant level drops by about two litres after an hour of running but the engine does not overheat. If I top it back up and run with the coolant cap off the Bowman heat exchanger the coolant quickly overflows and has bubbles in it. I've also got a diesel leak under the head gasket joint on one cylinder, this is the part that confuses me the most as I've no idea how diesel could leak from the head gasket. Is it possible for a warped head to cause a diesel leak?

 

[Latestarter1]

I've an ancient BMC Diesel engine which was totally rebuilt five years ago. It starts fine (no compression problems) but is showing what I think might be head gasket or warped head symptoms. The coolant level drops by about two litres after an hour of running but the engine does not overheat. If I top it back up and run with the coolant cap off the Bowman heat exchanger the coolant quickly overflows and has bubbles in it. I've also got a diesel leak under the head gasket joint on one cylinder, this is the part that confuses me the most as I've no idea how diesel could leak from the head gasket. Is it possible for a warped head to cause a diesel leak?

Too little information I am afraid. Newage, Tempest, Thornycroft and others, did marinisations of 1.5, 1.8 2.2, 2.5, 3.4, 3.8, 5.1 and 5.7 liter as well as The 98 Series BMC diesel engines, models had their own foibles.

3.4 and above were all DI engines so no starting issues we cut down options a wee bit.

One design characteristic the larger BMC engines have is wet liner construction, since engine was rebuilt have you been using Fleetguard DCA water treatment, these engines were noted for leakage past liner seals or pinhole failure of liners due to cavitation, either way some models worse than others so engine type is relevant.

No fuel is present in head/block interface.