Hot not cold. Thanks for all the answers - As many may know - the JLR v8 ans the SCv6 have a crossover pipes to each head - fore and aft - these plastic (nylon?) seem to fail when least expected - but usually around 50 to 90k miles . Slow leak at first then quick failure and lack of pressure - if engine is not shut down instantly ,,,,, ouch.. Plastic is 2 piece and glued - most failures are at the seam. See attached (not my arm...)
So what really is happening here? Is it heat soak? Radiant heat from the engine or coolant from the inside,,,,It is possible to insulate from radiant heat for sure.. maybe the expansion characteristics are just too much? Are the chemicals in the coolant to blame? Now I read that is cold climates the parts become brittle. Maybe a heat shield and a fan on thermostat,,,, My old turbo beemer has a blower on a timer to cool it down..
Or, I could just forget it and spend 2k every 50k miles or who knows? My LR is low miles but its 5 years old and not a lot duty cycles
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