sierrafery
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BTW is the top hose rock solid when the symptom occurs ?
Time for a new head?
- Thread starter tom1979
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triggersbroom
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It might be worth checking drive from power steering pump hasn't failed or is slipping causing lack of circulation or slow circulation
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None of the hoses are excessively hard, but I can’t check them while driving at 80. Once the cap’s popped there’s no pressure in the system anyway
Was your coolant loss caused by the cracked head or vice versa? My temp gauge doesn’t move (the temp does rise but not to the coolant Extent the gauge goes to the next level)
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Would that not significantly increase the coolant temp as well though?
Only when the coolant got low, also only happened when under most load, normally when booting it.
sierrafery
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you dont have to check while driving... if there is gas leak into the system the top hose goes solid and stays so if you stop and let it idle
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The problem being that if the cap is damaged in the process like has happened before then there will be no pressure in the system afterwards
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Well the kit came today to pressurise the coolant system and all seems fine, no drops in pressure. I changed back to the original expansion tank but still getting the same problem. All I can think is it is a crack which is opening up when it's hot / boosting a lot (I'm running a 1.7bar map) or the head has shifted (plastic dowels - not sure how true that is).
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Both points are true, crack opens with heat when booting it, and LR in there wisdom used plastic dowels to align head, which have been known to shift.
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Think I'll put up with it (drive sensibly) while I look for a used AMC head 
sierrafery
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IMO the locating dowels are important just untill the head is torqued up... after that it is not supposed to be kept in place by those dowels whatsoever, if it shifts it's cos it wasnt torqued well, mine never had such issues caused by plastic dowels and i used only plastic when the head was changed due to a crack in the inlet port which let coolant into the combustion chamber, also after some boost tuning ... what i think is that maybe the engineers had something in mind when they set the overboost limit to 1.42 bar cos strangely the coolant's pressure is set to 1.4 as well, maybe the whole setup was not conceived to run at 1.7 bar boost even if others who are using the vehicles only for off road didnt have problems yet
Ian M in France
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I have same problem with mine, just when towing up hills, My son drives it a lot with the trailer, One question, the top hose does go hard, but if I was losing coolant and the water boiled in the engine would that not make the hose ridged?IMO the locating dowels are important just untill the head is torqued up... after that it is not supposed to be kept in place by those dowels whatsoever, if it shifts it's cos it wasnt torqued well, mine never had such issues caused by plastic dowels and i used only plastic when the head was changed due to a crack in the inlet port which let coolant into the combustion chamber, also after some boost tuning ... what i think is that maybe the engineers had something in mind when they set the overboost limit to 1.42 bar cos strangely the coolant's pressure is set to 1.4 as well, maybe the whole setup was not conceived to run at 1.7 bar boost even if others who are using the vehicles only for off road didnt have problems yet
I also had the same problem with the other engine I had in it, I tightened down the head a bit more, I used a angle gauge, check all where torqued down, then added about 1/8 of a turn, I do not know if it was a good idea but it stopped the problem, about a year later oil pump bolt broke and finished engine
