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jim-beamer 
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Joined: 25-July-2007 Location: coatbridge/lanarkshire Status: Offline Points: 324 |
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 Topic: engine pressurePosted: 31-January-2014 at 19:29 |
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hi folks, can anyone help with my question...
what causes over-pressure in the expansion bottle of a 98 E39..528 petrol ??? there is no emulsification of the oil on the oil filler cap, and when the expansion bottle cap is removed, the water fizzes like champagne....any thoughts ????? thank in advance jimbo PS...its not my current car, its another one I'm thinking of buying Edited by jim-beamer - 31-January-2014 at 19:30 |
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 E53 X5, 2003 318i SE, Suzuki GSXR www.jgrecovery.com |
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Indian
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Joined: 29-March-2009 Status: Offline Points: 78 |
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Posted: 01-February-2014 at 10:05 |
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Cylinder head gasket?
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Andrew Rolland
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Go away rain Joined: 19-August-2004 Location: Scotland Status: Offline Points: 6579 |
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Posted: 03-February-2014 at 08:22 |
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Other than what Indian says.....
What is the engine temp gauge like? The E39 should rise to the middle of normal and stay there and not move a mm. If it does move to the hot then something is wrong with the coolant system.
When you say over pressure is the coolant leaking past the cap?
The system is designed to be under a certain amount of pressure. If you are brave enough to take the cap off when the engine is hot or running you will always get a release of pressure.
If there signs it has leaked past the cap it could just be that the seals on the cap are perished. Even the youngest E39 will be over 10 years old now so rubber things may start to be showing signs of their age.
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Current '13 62 F10 535i MSport Auto Previous '04 04 E60 545i SE Auto '03 53 E60 545i SE Auto (Stolen) '98 S E39 523i SE Auto |
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jim-beamer
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Joined: 25-July-2007 Location: coatbridge/lanarkshire Status: Offline Points: 324 |
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Posted: 11-February-2014 at 16:41 |
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thanks indian, and the temp gauge is gubbed Andrew, but turns out to be head gasket ...
Anyway, I have took ages to answer cos I have been out in my garage stripping the old beast...lots n lots of nice useable parts too... cheers guys jimbo |
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engine pressure
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