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Old 04-13-2005, 11:02   #1 (permalink)
Vassie Naicker
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heating problem

My 1970 XJ6 has developed a heating problem. For some time now the heat
gauge rose up to 75% when the car is driven, but now when I switch off the
motor a lot water steams out of the reservoir. There is no radiator cap,
this area appears to be sealed by the previous owner. The reservoir has just
a plastic cap (no pressure release). The car is mostly driven for 30 minutes
weekly and now when it is used for 60 minutes or so, there seems to be a
problem. Any advice on on checking the water pump or oil dip-stick for
certain signs and the radiator?

Thanx in advance!
Vassie


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Old 04-13-2005, 14:02   #2 (permalink)
WayneC
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Re: heating problem

Vassie Naicker wrote:
> My 1970 XJ6 has developed a heating problem. For some time now the heat
> gauge rose up to 75% when the car is driven, but now when I switch off the
> motor a lot water steams out of the reservoir. There is no radiator cap,
> this area appears to be sealed by the previous owner. The reservoir has just
> a plastic cap (no pressure release). The car is mostly driven for 30 minutes
> weekly and now when it is used for 60 minutes or so, there seems to be a
> problem. Any advice on on checking the water pump or oil dip-stick for
> certain signs and the radiator?
>
> Thanx in advance!
> Vassie
>
>

My advice would be to take it to a radiator shop and let them check it
over. Obviously the car needs to have it's original pressure relief
valve restored, but the symptoms you describe could be caused by a water
leak in a hose or radiator, a radiator flow problem, a bad water pump
(pumps usually leak and/or get noisy when they fail), or a stuck
thermostat, among other possibilities.
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Old 04-13-2005, 17:03   #3 (permalink)
T.G. Lambach
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Re: heating problem

Pressure caps raise the coolant's boiling point, that's why they're used
on all cars.

The coolant should be a mixture of about 50% antifreeze and 50% water.

The engine's coolant is at its hottest just after the engine is shut
off. That's because it stops circulating and so has to absorb more heat
from the cylinder head and block. So if the coolant is to boil that's
when it will boil.

So at shut down, without a radiator pressure cap, the engine coolant
will easily boil.

Prior owner may have wanted to "save" the $10 cost of a pressure cap or,
hide a leak somewhere by not pressurizing the cooling system. Consider
that restoring the cooling system may lead to further cost than a
pressure cap.
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Old 04-13-2005, 18:01   #4 (permalink)
Steve R.
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Re: heating problem

Check the dip stick. If there is coolant in the oil it will be obvious! With
the engine cold, remove the spark plugs. Look for moisture and coolant on
them. Either symptom indicates a burn through on the head gasket. I had the
same problem with a MKIX many years ago. If, on disassembly, you find a
burned path in the head gasket, check the cylinder head for warpage.

Steve R.


"Vassie Naicker" <vassien@mweb.co.za> wrote in message
news:KfednSFHE8gDxsDfRVn-3g@is.co.za...
> My 1970 XJ6 has developed a heating problem. For some time now the heat
> gauge rose up to 75% when the car is driven, but now when I switch off the
> motor a lot water steams out of the reservoir. There is no radiator cap,
> this area appears to be sealed by the previous owner. The reservoir has
> just a plastic cap (no pressure release). The car is mostly driven for 30
> minutes weekly and now when it is used for 60 minutes or so, there seems
> to be a problem. Any advice on on checking the water pump or oil dip-stick
> for certain signs and the radiator?
>
> Thanx in advance!
> Vassie
>



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Old 04-14-2005, 17:01   #5 (permalink)
Steve R.
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Posts: n/a
Re: heating problem...ooops!


"Steve R." <ud233@victoria.tc.ca> wrote in message
news:425db165@news.victoria.tc.ca...
> Check the dip stick. If there is coolant in the oil it will be obvious!
> With the engine cold, remove the spark plugs. Look for moisture and
> coolant on them. Either symptom indicates a burn through on the head
> gasket. I had the same problem with a MKIX many years ago.


That should have read MKX.

If, on disassembly, you find a
> burned path in the head gasket, check the cylinder head for warpage.
>
> Steve R.
>
>
> "Vassie Naicker" <vassien@mweb.co.za> wrote in message
> news:KfednSFHE8gDxsDfRVn-3g@is.co.za...
>> My 1970 XJ6 has developed a heating problem. For some time now the heat
>> gauge rose up to 75% when the car is driven, but now when I switch off
>> the motor a lot water steams out of the reservoir. There is no radiator
>> cap, this area appears to be sealed by the previous owner. The reservoir
>> has just a plastic cap (no pressure release). The car is mostly driven
>> for 30 minutes weekly and now when it is used for 60 minutes or so, there
>> seems to be a problem. Any advice on on checking the water pump or oil
>> dip-stick for certain signs and the radiator?
>>
>> Thanx in advance!
>> Vassie
>>

>
>



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Old 05-01-2005, 08:01   #6 (permalink)
Vassie
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Posts: n/a
Re: heating problem

The radiator has been tested and I believe there is a head gasket leak.
There is no evidence of oil on the dip-stick. Do I have to take the cylinder
head out, or are there any quick fixes. The setup of the radiator without a
main radiator cap is satisfactory according to the repair shop, he says the
modification is fine. As explained, this heating problem has gradually
increased over time.


"WayneC" <WayneC@linkline.moc> wrote in message
news:115qu9knh6hpv07@corp.supernews.com...
> Vassie Naicker wrote:
>> My 1970 XJ6 has developed a heating problem. For some time now the heat
>> gauge rose up to 75% when the car is driven, but now when I switch off
>> the motor a lot water steams out of the reservoir. There is no radiator
>> cap, this area appears to be sealed by the previous owner. The reservoir
>> has just a plastic cap (no pressure release). The car is mostly driven
>> for 30 minutes weekly and now when it is used for 60 minutes or so, there
>> seems to be a problem. Any advice on on checking the water pump or oil
>> dip-stick for certain signs and the radiator?
>>
>> Thanx in advance!
>> Vassie

> My advice would be to take it to a radiator shop and let them check it
> over. Obviously the car needs to have it's original pressure relief valve
> restored, but the symptoms you describe could be caused by a water leak in
> a hose or radiator, a radiator flow problem, a bad water pump (pumps
> usually leak and/or get noisy when they fail), or a stuck thermostat,
> among other possibilities.



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Old 05-01-2005, 08:01   #7 (permalink)
atec
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Posts: n/a
Re: heating problem

Vassie Naicker wrote:
> My 1970 XJ6 has developed a heating problem. For some time now the heat
> gauge rose up to 75% when the car is driven, but now when I switch off the
> motor a lot water steams out of the reservoir. There is no radiator cap,
> this area appears to be sealed by the previous owner. The reservoir has just
> a plastic cap (no pressure release). The car is mostly driven for 30 minutes
> weekly and now when it is used for 60 minutes or so, there seems to be a
> problem. Any advice on on checking the water pump or oil dip-stick for
> certain signs and the radiator?
>
> Thanx in advance!
> Vassie
>
>

I have just replaced the radiator in one of my OHC 4 litre Fords , it
tested fine and both mechanics testing insisted it was fine , but the
classic symptoms of over heating over a modest speed and getting very
hot when stationary after a short un ( less than 10k) indicated is was
faulty , New radiator fixed it and now its running at 74 Deg V on the
top hose.
I would suggest either borrow a suitable radiator or seriously
consider the damage resulting if it is faulty .
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Old 05-01-2005, 16:01   #8 (permalink)
John Hudson
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Re: heating problem


"Vassie" <vassien@mweb.co.za> wrote in message
news:Q8GdnRgMFutXfenfRVn-hA@is.co.za...
> The radiator has been tested and I believe there is a head gasket leak.
> There is no evidence of oil on the dip-stick. Do I have to take the
> cylinder head out, or are there any quick fixes. The setup of the radiator
> without a main radiator cap is satisfactory according to the repair shop,
> he says the modification is fine. As explained, this heating problem has
> gradually increased over time.
>

Sounds like there may be a leaking head gasket like you thought. Check
for bubbles in the coolant with the engine running. The gasket fails between
a cylinder, often #2 (second from back) and the water passages, you won't
find water in the oil. This failure causes some coolant to be drawn into the
cylinder on the induction stroke and the cooling system to become over
pressurised as the fuel/air mixture is forced into the water passages during
compression. To test, first remove the radiator cap, take out all the spark
plugs and do a compression test. Coolant will overflow or shoot out of the
radiator filler neck when you get to the faulty cylinder. If you don't have
a compression tester, just try it with one plug fitted, the engine turns
over faster with the plugs out. That's how I found mine was faulty. Let's
know if you have to pull the head off, no quick fixes, just be thankful it's
a SI, makes it less complicated. BTW, the cap on the header tank on the
front of the engine is normally not a pressure cap, but the one on the tank
on the fender is.

--
regards,
John Hudson
Brisbane Australia
71 SI XJ6, 85 SIII XJ6


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Old 05-01-2005, 18:01   #9 (permalink)
Steve R.
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Posts: n/a
Re: heating problem

They can burn through to the water jacket. In that case, there will be no
water in the oil. There is no easy fix. The head must come off. With the
cylinder head off, check for warpage of both head, and cylinder block. The
head is almost always warped when this happens.

Steve R.


"Vassie" <vassien@mweb.co.za> wrote in message
news:Q8GdnRgMFutXfenfRVn-hA@is.co.za...
> The radiator has been tested and I believe there is a head gasket leak.
> There is no evidence of oil on the dip-stick. Do I have to take the
> cylinder head out, or are there any quick fixes. The setup of the radiator
> without a main radiator cap is satisfactory according to the repair shop,
> he says the modification is fine. As explained, this heating problem has
> gradually increased over time.
>
>
> "WayneC" <WayneC@linkline.moc> wrote in message
> news:115qu9knh6hpv07@corp.supernews.com...
>> Vassie Naicker wrote:
>>> My 1970 XJ6 has developed a heating problem. For some time now the heat
>>> gauge rose up to 75% when the car is driven, but now when I switch off
>>> the motor a lot water steams out of the reservoir. There is no radiator
>>> cap, this area appears to be sealed by the previous owner. The reservoir
>>> has just a plastic cap (no pressure release). The car is mostly driven
>>> for 30 minutes weekly and now when it is used for 60 minutes or so,
>>> there seems to be a problem. Any advice on on checking the water pump or
>>> oil dip-stick for certain signs and the radiator?
>>>
>>> Thanx in advance!
>>> Vassie

>> My advice would be to take it to a radiator shop and let them check it
>> over. Obviously the car needs to have it's original pressure relief valve
>> restored, but the symptoms you describe could be caused by a water leak
>> in a hose or radiator, a radiator flow problem, a bad water pump (pumps
>> usually leak and/or get noisy when they fail), or a stuck thermostat,
>> among other possibilities.

>
>




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Old 05-01-2005, 23:01   #10 (permalink)
Chris Halpin
Guest
 
Posts: n/a
Re: heating problem

Be aware that the head will need to be straightened before the face is
machined. The cam shaft will be under stress otherwise.
Chris

Steve R. wrote:

>They can burn through to the water jacket. In that case, there will be no
>water in the oil. There is no easy fix. The head must come off. With the
>cylinder head off, check for warpage of both head, and cylinder block. The
>head is almost always warped when this happens.
>
>Steve R.
>
>
>"Vassie" <vassien@mweb.co.za> wrote in message
>news:Q8GdnRgMFutXfenfRVn-hA@is.co.za...
>
>
>>The radiator has been tested and I believe there is a head gasket leak.
>>There is no evidence of oil on the dip-stick. Do I have to take the
>>cylinder head out, or are there any quick fixes. The setup of the radiator
>>without a main radiator cap is satisfactory according to the repair shop,
>>he says the modification is fine. As explained, this heating problem has
>>gradually increased over time.
>>
>>
>>"WayneC" <WayneC@linkline.moc> wrote in message
>>news:115qu9knh6hpv07@corp.supernews.com...
>>
>>
>>>Vassie Naicker wrote:
>>>
>>>
>>>>My 1970 XJ6 has developed a heating problem. For some time now the heat
>>>>gauge rose up to 75% when the car is driven, but now when I switch off
>>>>the motor a lot water steams out of the reservoir. There is no radiator
>>>>cap, this area appears to be sealed by the previous owner. The reservoir
>>>>has just a plastic cap (no pressure release). The car is mostly driven
>>>>for 30 minutes weekly and now when it is used for 60 minutes or so,
>>>>there seems to be a problem. Any advice on on checking the water pump or
>>>>oil dip-stick for certain signs and the radiator?
>>>>
>>>>Thanx in advance!
>>>>Vassie
>>>>
>>>>
>>>My advice would be to take it to a radiator shop and let them check it
>>>over. Obviously the car needs to have it's original pressure relief valve
>>>restored, but the symptoms you describe could be caused by a water leak
>>>in a hose or radiator, a radiator flow problem, a bad water pump (pumps
>>>usually leak and/or get noisy when they fail), or a stuck thermostat,
>>>among other possibilities.
>>>
>>>

>>
>>

>
>
>
>
>


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