300tdi system pressure

timandmick · Aug 20, 2018

my 300tdi system was pressurising so I decided to change the head a new one and while I was at it I put new water pump on it. So today when I took it out I stopped and decided to check to see if all were ok and guess what the system was pressurised and when I took the cap off it started to come gushing out with water from the expansion tank any advice would be great since dunno what to do now thanks

discool · Aug 20, 2018

Don’t worry, all disco’s cooling systems are pressurised when they get warm, just like any similar engine cooling system in other vehicles on the road.

But, if your interest is in over pressurised systems then there’s loads of threads already on that subject, here is one I picked at random with my search. https://www.landyzone.co.uk/land-rover/300tdi-pressurizing-cooling-system.184761/
Also a vehicles water pump has no bearing on the coolent pressure, the pump is just for circulation of the coolant.

timandmick · Aug 21, 2018

Thanks for the reply but even to the point where you can’t squeeze the pipe and it dumps the water threw the expansion bottle and put water pump on just to make sure water was getting around engine since don’t know when it was changed last

discool said:
Don’t worry, all disco’s cooling systems are pressurised when they get warm, just like any similar engine cooling system in other vehicles on the road.

But, if your interest is in over pressurised systems then there’s loads of threads already on that subject, here is one I picked at random with my search. https://www.landyzone.co.uk/land-rover/300tdi-pressurizing-cooling-system.184761/
Also a vehicles water pump has no bearing on the coolent pressure, the pump is just for circulation of the coolant.

nt

jamesmartin · Aug 21, 2018

timandmick said:
my 300tdi system was pressurising so I decided to change the head a new one and while I was at it I put new water pump on it. So today when I took it out I stopped and decided to check to see if all were ok and guess what the system was pressurised and when I took the cap off it started to come gushing out with water from the expansion tank any advice would be great since dunno what to do now thanks

check rad gets hot all over,top hose gets hot

timandmick · Aug 21, 2018

jamesmartin said:
check rad gets hot all over,top hose gets hot

Yeah all pipes get hot same for radiator since put new one on aswell

jamesmartin · Aug 21, 2018

how much gushing, if much its head gasket or cracked block

timandmick · Aug 21, 2018

jamesmartin said:
how much gushing, if much its head gasket or cracked block

To the point where I check level in rad it nearly empty since it been pushing it out new head was pressure tested and an erling gasket was used and new head bolts too. Checked block where gasket sits couldn’t see any cracks

jamesmartin · Aug 21, 2018

timandmick said:
To the point where I check level in rad it nearly empty since it been pushing it out new head was pressure tested and an erling gasket was used and new head bolts too. Checked block where gasket sits couldn’t see any cracks

blocks crack down the cylinders, not easy to see, a block full of water and bores cleaned of oil often show a stain a day later,but its quite rare

jamesmartin · Aug 21, 2018

timandmick said:
To the point where I check level in rad it nearly empty since it been pushing it out new head was pressure tested and an erling gasket was used and new head bolts too. Checked block where gasket sits couldn’t see any cracks

why test a new head ?

timandmick · Aug 21, 2018

jamesmartin said:
why test a new head ?

Just wanted to make sure it was ok and that wasn’t going to have issue with it

timandmick · Aug 21, 2018

jamesmartin said:
blocks crack down the cylinders, not easy to see, a block full of water and bores cleaned of oil often show a stain a day later,but its quite rare

When took head off no water or oil was in cylinders they were dry

jamesmartin · Aug 21, 2018

timandmick said:
Just wanted to make sure it was ok and that wasn’t going to have issue with it

didnt work as with any good idea

,if it was me id remove head and check gasket carefully for signs of staining if coolant is been pushed out

timandmick · Aug 21, 2018

jamesmartin said:
didnt work as with any good idea,if it was me id remove head and check gasket carefully for signs of staining if coolant is been pushed out

Yeah that’s what my last head did gasket was stained is it possible to have a warped block

jamesmartin · Aug 21, 2018

timandmick said:
When took head off no water or oil was in cylinders they were dry

doesnt prove theres no crack,its going to be a slight otherwise it would pump coolant out when cold

jamesmartin · Aug 21, 2018

timandmick said:
Yeah that’s what my last head did gasket was stained is it possible to have a warped block

yes, again rare but does happen

timandmick · Aug 21, 2018

Thats something I need to check then since got it five year ago and after a few weeks of useing it the hg failed so put new hg on and it has been Parked up until last few month

Gazbo · Aug 21, 2018

timandmick said:
Thats something I need to check then since got it five year ago and after a few weeks of useing it the hg failed so put new hg on and it has been Parked up until last few month

When filling the coolant system, did you bleed all the air out through the top of the thermostat housing.
When you fill the cooling system and then you start the engine with the cap off the coolant header tank can you see bubbles or does the coolant "woosh" out of the top.
Have you tested the thermostat operation, if it's not opening then the coolant won't circulate.

timandmick · Aug 21, 2018

Gazbo said:
When filling the coolant system, did you bleed all the air out through the top of the thermostat housing.
When you fill the cooling system and then you start the engine with the cap off the coolant header tank can you see bubbles or does the coolant "woosh" out of the top.
Have you tested the thermostat operation, if it's not opening then the coolant won't circulate.

Yeas bled it from their it has a new thermostat in but tested it today and guess what it doesn’t open so swapped it and so far everything seems fine

300tdi system pressure

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