Following on from previous post.....
(4x4 Cossie Engine)

Car was badly boiling over, so whipped the head off..... No signs of cracked block, damaged head, or failed head gasket. Changed head gasket and removed thermostat. Filled car with water, run engine and bled at thermostat point. Fans cut in and I thought prob solved, but the engine continued to get hotter and the fans kept cutting in latter and latter each time. The whole time the system was pressuring more and more and the expansion tank boiled its contents again

Ive been given a few ideas tomorrow but could really appreciate any help on this, and has anyone come across this before?

 

air lock.......

and also on a 4x4 you must always run with a thermostat fitted it directs flow even when closed. unlike the 2wd which is a far more basic setup

steve

 

ah ok,

they are a right coont to get the air out of then!

 

Rad could be blocked also as that causes the symptoms/trouble that you are having


Luciano

 

Its not holding pressure...

a leak...

Did you check?

Alex

 

saph related down the post have a read

http://www.fordscorpio.co.uk/cgi-bin...num=1133105627

might help

 

Water pump ?

 

I'd say your Rad is blocked

 

you havent got the car jacked up at the front have you ????

Reason i ask is because if you have , air gets trapped at the back of the head and will always air lock until the car is sat level
I blew the headgasket on my escoss when i changed the rad because i had it jacked up at the front when i was testing everything before i put the bumper etc back on the car

 

Cheers guys, will inspect rad today and make sure water pump is working.

Paul - I was told its a good idea to raise the front of the car when bleeding up, helps the air get to the expansion tank? Is this wrong info?

 

AlexF -
Do you mean a cylinder leakage test? or pressurising the cooling system and check for leaks?

I dont think the cooling system has any leaks because it holds pressure until the saftey release on the expansion cap lets go.

 

As above,rad would be my first thing to check

Before removing head

 

presure test the coolant system

it should hold 1.5-2.0bar for 2 mins... if not theres a leak

Alex

 

CosKev3 - Already done headgasket pal, to try and solve this problem.

Alex - I think you maybe right, been bleeding it runing it for about 30mins and managed to get it to not boil over, but found the coolant hose to the back of the head to be leaking Could it draw air in from there? Going to change this and try again.

 

have you replaced the expansion tank cap?

If the seal/relief valve has gone it will not hold pressure, unpressurised water boils at a cooler temperature than pressurised water, hence boiling over

 

It sure could...

change the cap as suggested above too and let us know how it goes!

Alex

 

Any news?

 

yes he posted the other day that the rad was found to be blocked solid, so all sorted now


steve

 

Pete

the air gets to the expansion tank as hot air rises I defo would never never never jack a 4x4 up at the front to bleed it

I know you have fixed the car anyway but still felt i should reply

 

It was a blocked radiator - he's made another post about it.

 

It could be a number of things really.

how was the head and block checked? i'd have had them illiminated both by having them pressure tested before refitting the head gasket

 

head gasket changed before checking rad...wounder

 

Your telling me, although im glad I changed it in some ways...One less job for the future and got to check block, head condition etc etc.

She now doest go above the halfway mark on the temp gauge.

As previous post all sorted now thanks to all for advice

 

well done pete

 

Thats what the cryin smiley was after what I said for m8!!!!!!!

Glad you sorted it

Had same prob on my old car,half the rad blocked solid

 

Thanks guys