Nissan Patrol 1997 RD28T excess pressure in the coolant.

[Ext User(sparx)]

If anyone can help it would be greatly appreciated. I have checked the
thermostat and water pump, had the raditor cleaned and seviced. Coolant
was bright green and when I removed the thermostat and water pump,
their housing were spotless so was the radiator. Cap also replaced.
Small bubbles of "gas" are pushing coolant slowly out of the radiator
and over filling the reserve. I know this sounds like a cracked head or
gasket, but two radiator specialist & my mechanic have found no exhaust
gas of any kind in the cooling system. Three different "sniffers" & a
Gas Anyliser found nothing. Temperature gets to mid range on warm days
after say - 25-50klm when it would normally only reach about one third.
After about one hundred klms around 1.5 litres needs to be put back in.
Removing the head on a diesel is the last resort. Sorry for the length
of this post (1st time), won't happen again.
Please help.

[Ext User(OzOne)]

On 19 Oct 2005 00:19:07 -0700, "sparx" <jefkel@nelsonbay.com>
scribbled thusly:

>If anyone can help it would be greatly appreciated. I have checked the
>thermostat and water pump, had the raditor cleaned and seviced. Coolant
>was bright green and when I removed the thermostat and water pump,
>their housing were spotless so was the radiator. Cap also replaced.
>Small bubbles of "gas" are pushing coolant slowly out of the radiator
>and over filling the reserve. I know this sounds like a cracked head or
>gasket, but two radiator specialist & my mechanic have found no exhaust
>gas of any kind in the cooling system. Three different "sniffers" & a
>Gas Anyliser found nothing. Temperature gets to mid range on warm days
>after say - 25-50klm when it would normally only reach about one third.
>After about one hundred klms around 1.5 litres needs to be put back in.
>Removing the head on a diesel is the last resort. Sorry for the length
>of this post (1st time), won't happen again.
>Please help.

Blown head gasket or cracked head no matter what the 'experts' say.


Oz1...of the 3 twins.

I welcome you to crackerbox palace,We've been expecting you.

[Ext User(John_H)]

sparx wrote:

>If anyone can help it would be greatly appreciated. I have checked the
>thermostat and water pump, had the raditor cleaned and seviced. Coolant
>was bright green and when I removed the thermostat and water pump,
>their housing were spotless so was the radiator. Cap also replaced.
>Small bubbles of "gas" are pushing coolant slowly out of the radiator
>and over filling the reserve. I know this sounds like a cracked head or
>gasket, but two radiator specialist & my mechanic have found no exhaust
>gas of any kind in the cooling system. Three different "sniffers" & a
>Gas Anyliser found nothing.

Best test might be to have an oil analysis done, which should be able
to detect even very small traces of coolant in the oil if there's an
internal leakage. Talk to your favourite oil company -- should cost
around $20.

--
John H

[Ext User(Noddy)]

<OzOne> wrote in message news:02tbl1p77gv3stpjbb4m0oulgbo953bp85@4ax.com...

> Blown head gasket or cracked head no matter what the 'experts' say.

Most likely.

Checking for exhaust gas in the cooling system isn't the most reliable
method of testing for a blown head gasket or cylinder head problem. Pressure
testing the cooling system is a much better idea.

--
Regards,
Noddy.

[Ext User(D Walford)]

Noddy wrote:
> <OzOne> wrote in message news:02tbl1p77gv3stpjbb4m0oulgbo953bp85@4ax.com...
>
>
>>Blown head gasket or cracked head no matter what the 'experts' say.
>
>
> Most likely.
>
> Checking for exhaust gas in the cooling system isn't the most reliable
> method of testing for a blown head gasket or cylinder head problem. Pressure
> testing the cooling system is a much better idea.
>
Agreed, there is nothing else that can cause that problem.



Daryl

[Ext User(sparx)]

Thanks guys, pressure test OK, No water in oil (visable). I'm looking
for an easier answer - nothing to do with the turbo (oxygen only) and
expansion from heating in the coolant. I'm hurting here as I don't want
to pull the head off!

[Ext User(atec)]

sparx wrote:

>Thanks guys, pressure test OK, No water in oil (visable). I'm looking
>for an easier answer - nothing to do with the turbo (oxygen only) and
>expansion from heating in the coolant. I'm hurting here as I don't want
>to pull the head off!
>
>
>
next thing will be some sort of cylinder compression test , but how do
you insert the tester into a plus hole ?

[Ext User(sparx)]

I guess its back to my mechanic to sort out. I suppose removing
manifolds etc. one at a-time and doing a thorough inspection of each
componant of the combustion side of things will be the only possible
answer for me.

[Ext User(Rheilly Phoull)]

"sparx" <jefkel@nelsonbay.com> wrote in message
news:1129716815.104004.287840@g43g2000cwa.googlegr oups.com...
>I guess its back to my mechanic to sort out. I suppose removing
> manifolds etc. one at a-time and doing a thorough inspection of each
> componant of the combustion side of things will be the only possible
> answer for me.
>
For the coolant to be displaced there must be some emission into the cooling
cavities. Surely the head and associated equipment must be the only source
of such pressure? With no oil in the coolant the head gasket or head itself
must be suspect, you are gonna have to bite the bullet here :-(

--
Regards ......... Rheilly Phoull