overheating

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pitlanekat
Posts: 7
Joined: Mon Feb 08, 2010 11:03 pm
MGF Register Region: Midlands

overheating

Post by pitlanekat » Mon Feb 08, 2010 11:09 pm

Hi,
new to this forum and new to ownership of MGF and wondered if anyone can help ?

Car has been running fine till last night when it overheated twice in a short space of time and the oil pressure guage dropped,any ideas would be gratefully recieved ???? :cry:
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adrianclifford
Posts: 8007
Joined: Mon Oct 01, 2007 6:56 pm
MGF Register Region: Essex
Model of Car: MGTF 80LE
Location: Leigh on Sea

Re: overheating

Post by adrianclifford » Tue Feb 09, 2010 12:08 am

Hi there, without looking at the car, the symptoms could indicate head gasket failure. Have you checked the engine oil level and condition ? (It should be clean and free of coolant), it may appear like mayonnaise if contaminated.

Have you checked the coolant level, it should be around the seam of the expansion tank when cold.

If these are clear and correct, then it may just be the expansion tank cap letting by, that should be replaced immediately. You cannot afford to lose too much water in an F as it does not hold much, obviously engine damage will occur if driven in that condition.

You have not said about the water temperature guage, what was that showing ?
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Rob Bell
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Joined: Tue Oct 02, 2007 2:36 pm
MGF Register Region: South East
Model of Car: MGF 1.8i + MGF Shed!

Re: overheating

Post by Rob Bell » Tue Feb 09, 2010 2:36 pm

Be very careful, and I wouldn't try using the car again until you or a mechanic gets to have a look at the car.

I presume that you mean the oil temperature gauge? The MGF doesn't have a pressure gauge, unless one has been fitted as aftermarket.

A sudden drop in oil pressure is very very worrying, and is usually a sign that something expensive has gone wrong.

A sudden drop of oil temperature is more difficult to explain - unless the sensor or loom has failed, or the sensor is no long in the oil flow...

Check out the coolant and oil - make sure that the coolant still looks like coolant (green or orange antifreeze) and the oil still looks like oil (usually dark brown/black if well used). If you see no coolant in the expansion tank, or vast quantities of buttery-brown coloured oily stuff (affectionately known as "mayonnaise") then Adrian's right, you've had a head gasket failure...
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pitlanekat
Posts: 7
Joined: Mon Feb 08, 2010 11:03 pm
MGF Register Region: Midlands

Re: overheating

Post by pitlanekat » Tue Feb 09, 2010 8:31 pm

Thanks for your replies,according to the previous owner the head gasket was changed in the last 2 years so hopefully it'snot that :shutup: having it checked out on Friday so fingers crossed
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