Rich Hampel

above replies are realistic and common.

In addition get the mechanic to add a carbon monoxide 'fluorescent dye'
to the radiator. He then will check the cooling water with 'black
light' to see if the water is fluorescent indicating the presence of
carbon monoxide from a blown head gasket. A blown head gasket can
somtimes act this way .... the pressure in the cooling system passages
at the head gasket seals the leak when the water is under pressure but
allows leakage (into the combustion chamber) when the engine cools.
This is quite common with marine engines with 'wet' exhaust systems.

So, the real question is: when was the last time that you re-torqued
the head bolts??? IMHO, probably should be done at 60K miles then
every 30K thereafter, especially if yoiui're running hard and sometimes
'lug' the engine (low rpm and high load).


In article <ce5e9249.0411021148.662a3fab@posting.google.com >, Ankors
<dmccall@gmail.com> wrote:

> Hello All,
>
> Quick question – I have a 95 5.2L Jeep Grand Cherokee, car has been
> amazing - 210K and very little has gone wrong (other than new rotors
> far too often!). I give it a good bashing off road once in a while and
> after the most recent session it has developed a coolant leak.
>
> I have been having leaks in the past, mostly the occasional leak from
> the header tank that I put down to an intermittent blockage in the
> system, and a full flush seemed to solve the problem.
>
> However this time it seems different, the leak ONLY occurs when the
> engine is switched off after a period of running (hence the system de
> pressurized) and then it throws out at a fair rate – about a liter of
> coolant. It appears to be coming from around the water pump but it is
> difficult to see exactly where the leak is from. I drove 150 miles
> yesterday on the freeway and it never looses any coolant when the
> engine is running.
>
> Also it only chucks out coolant when the engine is stopped about 60 %
> of the time.
>
> I am guessing due to the fact that it is only leaking when the system
> is de pressurized that this might be a water pump seal problem? Hoses
> look fine.
>
> I would tackle this myself but unfortunately had all my tools stolen
> some time ago, and now also lack the space to work on the car – so
> will have to take it to some back street shop – so wanted to get a
> decent idea of what it might be, before they start trying to sell me a
> new back axle etc…
>
> Any knowledge, ideas etc.. would be most greatly appreciated.
>
> Thanks to all

Rich Hampel

above replies are realistic and common.

In addition get the mechanic to add a carbon monoxide 'fluorescent dye'
to the radiator. He then will check the cooling water with 'black
light' to see if the water is fluorescent indicating the presence of
carbon monoxide from a blown head gasket. A blown head gasket can
somtimes act this way .... the pressure in the cooling system passages
at the head gasket seals the leak when the water is under pressure but
allows leakage (into the combustion chamber) when the engine cools.
This is quite common with marine engines with 'wet' exhaust systems.

So, the real question is: when was the last time that you re-torqued
the head bolts??? IMHO, probably should be done at 60K miles then
every 30K thereafter, especially if yoiui're running hard and sometimes
'lug' the engine (low rpm and high load).


In article <ce5e9249.0411021148.662a3fab@posting.google.com >, Ankors
<dmccall@gmail.com> wrote:

> Hello All,
>
> Quick question – I have a 95 5.2L Jeep Grand Cherokee, car has been
> amazing - 210K and very little has gone wrong (other than new rotors
> far too often!). I give it a good bashing off road once in a while and
> after the most recent session it has developed a coolant leak.
>
> I have been having leaks in the past, mostly the occasional leak from
> the header tank that I put down to an intermittent blockage in the
> system, and a full flush seemed to solve the problem.
>
> However this time it seems different, the leak ONLY occurs when the
> engine is switched off after a period of running (hence the system de
> pressurized) and then it throws out at a fair rate – about a liter of
> coolant. It appears to be coming from around the water pump but it is
> difficult to see exactly where the leak is from. I drove 150 miles
> yesterday on the freeway and it never looses any coolant when the
> engine is running.
>
> Also it only chucks out coolant when the engine is stopped about 60 %
> of the time.
>
> I am guessing due to the fact that it is only leaking when the system
> is de pressurized that this might be a water pump seal problem? Hoses
> look fine.
>
> I would tackle this myself but unfortunately had all my tools stolen
> some time ago, and now also lack the space to work on the car – so
> will have to take it to some back street shop – so wanted to get a
> decent idea of what it might be, before they start trying to sell me a
> new back axle etc…
>
> Any knowledge, ideas etc.. would be most greatly appreciated.
>
> Thanks to all

Rich Hampel

above replies are realistic and common.

In addition get the mechanic to add a carbon monoxide 'fluorescent dye'
to the radiator. He then will check the cooling water with 'black
light' to see if the water is fluorescent indicating the presence of
carbon monoxide from a blown head gasket. A blown head gasket can
somtimes act this way .... the pressure in the cooling system passages
at the head gasket seals the leak when the water is under pressure but
allows leakage (into the combustion chamber) when the engine cools.
This is quite common with marine engines with 'wet' exhaust systems.

So, the real question is: when was the last time that you re-torqued
the head bolts??? IMHO, probably should be done at 60K miles then
every 30K thereafter, especially if yoiui're running hard and sometimes
'lug' the engine (low rpm and high load).


In article <ce5e9249.0411021148.662a3fab@posting.google.com >, Ankors
<dmccall@gmail.com> wrote:

> Hello All,
>
> Quick question – I have a 95 5.2L Jeep Grand Cherokee, car has been
> amazing - 210K and very little has gone wrong (other than new rotors
> far too often!). I give it a good bashing off road once in a while and
> after the most recent session it has developed a coolant leak.
>
> I have been having leaks in the past, mostly the occasional leak from
> the header tank that I put down to an intermittent blockage in the
> system, and a full flush seemed to solve the problem.
>
> However this time it seems different, the leak ONLY occurs when the
> engine is switched off after a period of running (hence the system de
> pressurized) and then it throws out at a fair rate – about a liter of
> coolant. It appears to be coming from around the water pump but it is
> difficult to see exactly where the leak is from. I drove 150 miles
> yesterday on the freeway and it never looses any coolant when the
> engine is running.
>
> Also it only chucks out coolant when the engine is stopped about 60 %
> of the time.
>
> I am guessing due to the fact that it is only leaking when the system
> is de pressurized that this might be a water pump seal problem? Hoses
> look fine.
>
> I would tackle this myself but unfortunately had all my tools stolen
> some time ago, and now also lack the space to work on the car – so
> will have to take it to some back street shop – so wanted to get a
> decent idea of what it might be, before they start trying to sell me a
> new back axle etc…
>
> Any knowledge, ideas etc.. would be most greatly appreciated.
>
> Thanks to all

DaveW

Rich Hampel wrote:

> So, the real question is: when was the last time that you re-torqued
> the head bolts??? IMHO, probably should be done at 60K miles then
> every 30K thereafter, especially if yoiui're running hard and sometimes
> 'lug' the engine (low rpm and high load).
>

That's news to me. I thought that once an engine was past break in,
things like head bolts would stay put until something blows at 200k
miles (or whatever).

Regards,

DAve

DaveW

Rich Hampel wrote:

> So, the real question is: when was the last time that you re-torqued
> the head bolts??? IMHO, probably should be done at 60K miles then
> every 30K thereafter, especially if yoiui're running hard and sometimes
> 'lug' the engine (low rpm and high load).
>

That's news to me. I thought that once an engine was past break in,
things like head bolts would stay put until something blows at 200k
miles (or whatever).

Regards,

DAve

DaveW

Rich Hampel wrote:

> So, the real question is: when was the last time that you re-torqued
> the head bolts??? IMHO, probably should be done at 60K miles then
> every 30K thereafter, especially if yoiui're running hard and sometimes
> 'lug' the engine (low rpm and high load).
>

That's news to me. I thought that once an engine was past break in,
things like head bolts would stay put until something blows at 200k
miles (or whatever).

Regards,

DAve

Ankors

Thanks for your comments guys. Looks like a new Water pump is most likely.

I'll get them to test the system tho all the same.

Thanks again. I'll report back soon.

Ankors

Thanks for your comments guys. Looks like a new Water pump is most likely.

I'll get them to test the system tho all the same.

Thanks again. I'll report back soon.