heads up

[BUSHWHACKER]

OH! Why?
It said on the poster protects and seals cracks in heads, blocks, rads etc. PERMANENTLY.
Is it detrimental then and in what way?

It'll also seal and or restict tiny waterways in the cylinderhead and coolant hoses too, not good.

[Wolfracer]

It'll also seal and or restict tiny waterways in the cylinderhead and coolant hoses too, not good.

I thought it stayed liquid unless exposed to air at high temps? (might be wrong on this but I thought this was how it worked) so unless a problem it wouldn't do anything, but stay liquid?
Anyway, can keep it in the tidy holes in the boot, "just in case......"

[BUSHWHACKER]

I thought it stayed liquid unless exposed to air at high temps? (might be wrong on this but I thought this was how it worked) so unless a problem it wouldn't do anything, but stay liquid?
Anyway, can keep it in the tidy holes in the boot, "just in case......"

I wouldn't like it circulating around the already fragile cooling system including the water pump, it may cause more expensive problems later on.

[blackpoolsparks]

I thought it stayed liquid unless exposed to air at high temps? (might be wrong on this but I thought this was how it worked) so unless a problem it wouldn't do anything, but stay liquid?
Anyway, can keep it in the tidy holes in the boot, "just in case......"

I was of the same opinion, but a lot of guys here, who appear to know a bit, are strictly against it. I bought an expensive version of the same formula (£35) and d aren't use it, not even in an emergency.

[Vagrant No2]

I have not read the whole of this thread but can say as a mechanic nearly all manufacurers diesel engines have cracked heads normally about 90000 - 100000 miles .
VW even released a crack measuring guide so you can see if the head could be reused .
I know of Mitsy , Range Rover , VW , Daihatsu .... all cracked .

Admitedly good upkeep of coolant system does help .

[David 2.4td]

We could try using one of those electric water pumps (made by a company called Davies Craig). I think you fit the pump in the bottom rad hose and remove the standard water pump or maybe just the impeller (not sure), and i think you remove the thermostat too. It's driven by a controller that monitors the water temp via it's own sensor fitted in the top hose. There's a switch or a dial on the controller that you can set the desired coolant temp and the variable speed pump will maintain the temp you told it to run at. It also has a warm up function for when the engine is cold, it runs the pump very slowly so the engine is able to warm properly. The amont of power that it saps from the engine (via the alternator) is supposed to be less than the amount of power the standard water pump would have taken. I haven't done this myself but it sound like an idea i'd like to carry out at some point.

[tonupteabag]

We could try using one of those electric water pumps (made by a company called Davies Craig). I think you fit the pump in the bottom rad hose and remove the standard water pump or maybe just the impeller (not sure), and i think you remove the thermostat too. It's driven by a controller that monitors the water temp via it's own sensor fitted in the top hose. There's a switch or a dial on the controller that you can set the desired coolant temp and the variable speed pump will maintain the temp you told it to run at. It also has a warm up function for when the engine is cold, it runs the pump very slowly so the engine is able to warm properly. The amont of power that it saps from the engine (via the alternator) is supposed to be less than the amount of power the standard water pump would have taken. I haven't done this myself but it sound like an idea i'd like to carry out at some point.

sounds interesting any more info available or a site for details and performance under stress also price and availability

[David 2.4td]

Yes just look up the website (google Davies Craig, dont get it the wrong way round or you might get loads of info about a sh*te 90's dance music singer, heh heh), i think they might be an Aussie firm, could be wrong. They list flow rates, i think they even have different sizes of pump, given the power or size of flow required. A lot of racers (bikes and cars) use them because they sap less power than a normal water pump, also i think you can program/set them to run after shut down to help prevent heat soak, might be a usefull function for us lot.

[Vagrant No2]

Or go to scrappy and get one of a Renault 19 or 21 I think . They were fitted to keep coolant circulating after engine switch off as heads warped and blew head gaskets,

[David 2.4td]

Are you able to remove the pump controller too or is it part of the renault ecu? Can you tell it what temp to maintain and it just does it regardless? What about the warm up phase?

[Mrbill]

Same idea, makes a good read

http://www.estimaowners.com/communit...head+%2Bthread

[Albannach]

i seem to be reading about more and more surf heads cracking,not only 2.4 heads but 3.0 and third gen now.is there something we can do as a forum,to unravel the mystery as to why they are cracking,there must be a reason.The trucks run fine in japan but as soon as we get them over here, they crack.Im not saying they all do it,but we as a forum must be able to put together some king of sticky thread,we all assume its a fault that lies within the head and that good precautionary servicing and looking after the cooling system helps.Or is there something that we are doing to these trucks that the japs dont do that weakens the head,like fuel for instance,octane ratings,etc.any one any thoughts ????

Hard water.

[JUDWAK]

Hard water.

you may have a very good piont there