Disco Still Overheating

S

Subscription

Guest

• Sep 15, 2006

• #1

Ok so still having problems with my V8 Disco 3.9EFI. The symptoms are as
follows. Seems to behave is you keep it at about 2.5k revs, all is good.
If you put it underload it over heats. Or on long journeys it over heats.
When it over heats, its squirts water out through the overflow tank. when it
cools i check the levels and there seems to be almost no water in it (more
loss than whats been squirted).

So far I have changed the thermostat, the water pump. I am doing a
compression test tomorrow. But there is no signs of steam in the exhaust or
water in the oil. Has anyone else had this ? Could it be a cracked block,
or purhaps the heater matrix ?

Ideas people would be really appreicated.


Thanks,

Richy.

 

T

TonyB

Guest

• Sep 15, 2006

• #2

"Subscription" <[email protected]> wrote in message
news:[email protected]...
> Ok so still having problems with my V8 Disco 3.9EFI. The symptoms are as
> follows. Seems to behave is you keep it at about 2.5k revs, all is good.
> If you put it underload it over heats. Or on long journeys it over heats.
> When it over heats, its squirts water out through the overflow tank. when
it
> cools i check the levels and there seems to be almost no water in it (more
> loss than whats been squirted).
>
> So far I have changed the thermostat, the water pump. I am doing a
> compression test tomorrow. But there is no signs of steam in the exhaust
or
> water in the oil. Has anyone else had this ? Could it be a cracked block,
> or purhaps the heater matrix ?
>
> Ideas people would be really appreicated.
>

Somethings blocked somewhere, maybe the radiator. Give it a good flush with
a garden hose first off.
TonyB

 

G

Graeme

Guest

• Sep 15, 2006

• #3

"Subscription" <[email protected]> wrote in message
news:[email protected]...
> Ok so still having problems with my V8 Disco 3.9EFI. The symptoms are as
> follows. Seems to behave is you keep it at about 2.5k revs, all is good.
> If you put it underload it over heats. Or on long journeys it over heats.
> When it over heats, its squirts water out through the overflow tank. when
it
> cools i check the levels and there seems to be almost no water in it (more
> loss than whats been squirted).
>
> So far I have changed the thermostat, the water pump. I am doing a
> compression test tomorrow. But there is no signs of steam in the exhaust
or
> water in the oil. Has anyone else had this ? Could it be a cracked block,
> or purhaps the heater matrix ?
>
> Ideas people would be really appreicated.
>
>
> Thanks,
>
> Richy.
>
Hi

I had this with a 3.5 V8 - it was a head cylinder gasket gone on one side -
never any steam either or mayonnaise in my oil.

Graeme

 

S

Subscription

Guest

• Sep 15, 2006

• #4

Tried the flush (forgot to mention sorry) seemed good as fast as it was
going in it was coming out.


"TonyB" <[email protected]> wrote in message
news:[email protected]...
>
> "Subscription" <[email protected]> wrote in message
> news:[email protected]...
>> Ok so still having problems with my V8 Disco 3.9EFI. The symptoms are as
>> follows. Seems to behave is you keep it at about 2.5k revs, all is
>> good.
>> If you put it underload it over heats. Or on long journeys it over
>> heats.
>> When it over heats, its squirts water out through the overflow tank. when
> it
>> cools i check the levels and there seems to be almost no water in it
>> (more
>> loss than whats been squirted).
>>
>> So far I have changed the thermostat, the water pump. I am doing a
>> compression test tomorrow. But there is no signs of steam in the exhaust
> or
>> water in the oil. Has anyone else had this ? Could it be a cracked
>> block,
>> or purhaps the heater matrix ?
>>
>> Ideas people would be really appreicated.
>>
>
> Somethings blocked somewhere, maybe the radiator. Give it a good flush
> with
> a garden hose first off.
> TonyB
>
>

 

D

Derek

Guest

• Sep 15, 2006

• #5

"Graeme" <[email protected]> wrote in message
news:[email protected]...
>
> "Subscription" <[email protected]> wrote in message
> news:[email protected]...
>> Ok so still having problems with my V8 Disco 3.9EFI. The symptoms are as
>> follows. Seems to behave is you keep it at about 2.5k revs, all is
>> good.
>> If you put it underload it over heats. Or on long journeys it over
>> heats.
>> When it over heats, its squirts water out through the overflow tank. when
> it
>> cools i check the levels and there seems to be almost no water in it
>> (more
>> loss than whats been squirted).
>>
>> So far I have changed the thermostat, the water pump. I am doing a
>> compression test tomorrow. But there is no signs of steam in the exhaust
> or
>> water in the oil. Has anyone else had this ? Could it be a cracked
>> block,
>> or purhaps the heater matrix ?
>>
>> Ideas people would be really appreicated.
>>
>>
>> Thanks,
>>
>> Richy.
>>
> Hi
>
> I had this with a 3.5 V8 - it was a head cylinder gasket gone on one
> side -
> never any steam either or mayonnaise in my oil.
>
> Graeme
>
Me too I found that if you take off the header tank cap and get an
assisitant to hold the revs the level rises followed by numerous pinhead
sized bubbles surging out a tiny gasket blow but when it empties the coolant
it beomes quite a problem.
Derek

 

L

Lee_D

Guest

• Sep 16, 2006

• #6

Derek <[email protected]> uttered summat worrerz funny
about:
> Me too I found that if you take off the header tank cap and get an
> assisitant to hold the revs the level rises followed by numerous
> pinhead sized bubbles surging out a tiny gasket blow but when it
> empties the coolant it beomes quite a problem.
> Derek

Isn't there some clever chemical widget you can bob in?

I've never paid them much attention as pulling heads off is far more
fun...not!

Lee D

 

G

Graeme

Guest

• Sep 16, 2006

• #7

"Lee_D" <[email protected]> wrote in message
news:[email protected]...
> Derek <[email protected]> uttered summat worrerz funny
> about:
> > Me too I found that if you take off the header tank cap and get an
> > assisitant to hold the revs the level rises followed by numerous
> > pinhead sized bubbles surging out a tiny gasket blow but when it
> > empties the coolant it beomes quite a problem.
> > Derek
>
> Isn't there some clever chemical widget you can bob in?
>
> I've never paid them much attention as pulling heads off is far more
> fun...not!
>
> Lee D
>
I found it great fun with the carbed V8 but the EFi?

Too many swear words

Graeme

 

P

Pacman

Guest

• Sep 16, 2006

• #8

"Subscription" <[email protected]> wrote in message
news:[email protected]...
> Ok so still having problems with my V8 Disco 3.9EFI. The symptoms are as
> follows. Seems to behave is you keep it at about 2.5k revs, all is good.
> If you put it underload it over heats. Or on long journeys it over heats.
> When it over heats, its squirts water out through the overflow tank. when
> it cools i check the levels and there seems to be almost no water in it
> (more loss than whats been squirted).
>
> So far I have changed the thermostat, the water pump. I am doing a
> compression test tomorrow. But there is no signs of steam in the exhaust
> or water in the oil. Has anyone else had this ? Could it be a cracked
> block, or purhaps the heater matrix ?
>

Have you got aircon? If so, remove the radiator and see how much rubbish
has accumalated between the 2 radiators. I removed half a forest from my
3.9 RR...dead leaves etc. I also found the cores on my radiator were
rotten, so replaced it, and I've never had a problem since!

--
Thanks,
Paul

 

S

Subscription

Guest

• Sep 16, 2006

• #9

No hasn't got aircon, which is a pain, might retro fit it though if i am
doing the heads as well. If it was the heads, would there be any benfit in
getting some new uprated heads? Its LPG as well so here they can wear the
heads ?

Also if it is a block has anyone bought a short block, would they recomend
any one ?

"Pacman" <[email protected]> wrote in message
news:[email protected]...
>
> "Subscription" <[email protected]> wrote in message
> news:[email protected]...
>> Ok so still having problems with my V8 Disco 3.9EFI. The symptoms are as
>> follows. Seems to behave is you keep it at about 2.5k revs, all is
>> good. If you put it underload it over heats. Or on long journeys it over
>> heats. When it over heats, its squirts water out through the overflow
>> tank. when it cools i check the levels and there seems to be almost no
>> water in it (more loss than whats been squirted).
>>
>> So far I have changed the thermostat, the water pump. I am doing a
>> compression test tomorrow. But there is no signs of steam in the exhaust
>> or water in the oil. Has anyone else had this ? Could it be a cracked
>> block, or purhaps the heater matrix ?
>>
>
> Have you got aircon? If so, remove the radiator and see how much rubbish
> has accumalated between the 2 radiators. I removed half a forest from my
> 3.9 RR...dead leaves etc. I also found the cores on my radiator were
> rotten, so replaced it, and I've never had a problem since!
>
> --
> Thanks,
> Paul
>

 

D

Dougal

Guest

• Sep 16, 2006

• #10

Pacman wrote:

> "Subscription" <[email protected]> wrote in message
> news:[email protected]...
>
>>Ok so still having problems with my V8 Disco 3.9EFI. The symptoms are as
>>follows. Seems to behave is you keep it at about 2.5k revs, all is good.
>>If you put it underload it over heats. Or on long journeys it over heats.
>>When it over heats, its squirts water out through the overflow tank. when
>>it cools i check the levels and there seems to be almost no water in it
>>(more loss than whats been squirted).
>>
>>So far I have changed the thermostat, the water pump. I am doing a
>>compression test tomorrow. But there is no signs of steam in the exhaust
>>or water in the oil. Has anyone else had this ? Could it be a cracked
>>block, or purhaps the heater matrix ?
>>
>
>
> Have you got aircon? If so, remove the radiator and see how much rubbish
> has accumalated between the 2 radiators. I removed half a forest from my
> 3.9 RR...dead leaves etc. I also found the cores on my radiator were
> rotten, so replaced it, and I've never had a problem since!
>
> --
> Thanks,
> Paul

Aircon not required for this problem - the comment about de-finned
radiator tubes is very valid, however.

 

D

Derek

Guest

• Sep 16, 2006

• #11

"Graeme" <[email protected]> wrote in message
news:[email protected]...
>
> "Lee_D" <[email protected]> wrote in message
> news:[email protected]...
>> Derek <[email protected]> uttered summat worrerz funny
>> about:
>> > Me too I found that if you take off the header tank cap and get an
>> > assisitant to hold the revs the level rises followed by numerous
>> > pinhead sized bubbles surging out a tiny gasket blow but when it
>> > empties the coolant it beomes quite a problem.
>> > Derek
>>
>> Isn't there some clever chemical widget you can bob in?
>>
>> I've never paid them much attention as pulling heads off is far more
>> fun...not!
>>
>> Lee D
>>
> I found it great fun with the carbed V8 but the EFi?
>
> Too many swear words
>
> Graeme
>
yep AIRC it cost me a £12 ratchet spanner to make the job much easier as
sockets won't fit round the injector rails the halfrauds type slim ratchet
went in like
a slippery thing into a slippery space
Derek

 

T

TonyB

Guest

• Sep 16, 2006

• #12

> Tried the flush (forgot to mention sorry) seemed good as fast as it was
> going in it was coming out.

Arse & buggrit. It's serious then. I can tell you from experience that the
heater matrix failing will blow steam through the air vents
and coolant under the drivers mat which drips to the ground.
Yours sounds ( as others have said ) might well be the head gasket.

TonyB

 

T

Tom Woods

Guest

• Sep 17, 2006

• #13

On Sat, 16 Sep 2006 08:23:21 +0100, "Lee_D"
<[email protected]> wrote:

>Derek <[email protected]> uttered summat worrerz funny
>about:
>> Me too I found that if you take off the header tank cap and get an
>> assisitant to hold the revs the level rises followed by numerous
>> pinhead sized bubbles surging out a tiny gasket blow but when it
>> empties the coolant it beomes quite a problem.
>> Derek
>
>Isn't there some clever chemical widget you can bob in?

Frosts have some special liquid that changes colour in their catalog.

 

A

Austin Shackles

Guest

• Sep 18, 2006

• #14

On or around Sat, 16 Sep 2006 17:51:38 +0100, "TonyB"
<[email protected]> enlightened us thusly:

>> Tried the flush (forgot to mention sorry) seemed good as fast as it was
>> going in it was coming out.
>
>Arse & buggrit. It's serious then. I can tell you from experience that the
>heater matrix failing will blow steam through the air vents
>and coolant under the drivers mat which drips to the ground.
>Yours sounds ( as others have said ) might well be the head gasket.

FWIW, I'm VERY skeptical about rad flushing.

Add up the cumulative area of all the little tubes, and compare with the
bore of your garden hose... You need quite a high pressure differential to
blow crud out of a blocked rad tube. I'd think that your garden house
equates to about, oh, 30 rad tubes at most, in terms of bore. and that's
not much of the rad - once that many are clear, you don't get any pressure
build-up.


You need a much bigger water supply than any normal garden hose. even then,
I suspect that the cumulative area of the rad tubes is bigger than the rad
hose connections, so you just change the problem to a different one.


On the V8 110, I spent a good deal of time effort and swearing trying to get
the rad to work properly and stop it overheating when it was either working
hard or moving slowly, and NONE of it bloody worked. In the end I gave up
and bought a new rad and it cured the problem instantly.

--
Austin Shackles. www.ddol-las.net my opinions are just that
"The breezy call of incense-breathing Morn, The swallow twittering
from the strawbuilt shed, The cock's shrill clarion, or the echoing
horn, No more shall rouse them from their lowly bed."
Thomas Gray, Elegy Written in a Country Churchyard.