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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 05-18-2017, 12:31 PM
Rutland75 Rutland75 is offline
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Mein Auto: E39 323i 2000
O Rings

I understand that you cannot purchase through BMW the o rings that fit onto the top or bottom water coolant hose.
Does anyone have the correct sizes for the top and bottom hose connections?
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Old 05-18-2017, 12:52 PM
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crazy4trains crazy4trains is offline
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Try BMP Design. I think they sell them.
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2002 530i
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Old 05-18-2017, 10:54 PM
Aussie528iT Aussie528iT is offline
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They are metric sized O rings - 37mm I/D and 4mm dia cross section.
The size was measured from new O rings in new BMW radiator hoses.
Don't use "near enough" imperial sized O rings unless you want leaks down the track.
They also need to be glycol resistant O rings - standard neoprene should do.
Only use plain water as a lubricant, not coolant, when installing the hoses. Coolant leaves a deposit when it dries that can cause leaks.

RonR
99 528iT M52TU 5HP19 RHD Euro spec
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Old 05-19-2017, 02:51 PM
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Brandon002 Brandon002 is offline
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Chances are if the O-Rings are leaking the hoses need to be replaced.

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Old 05-20-2017, 12:54 AM
Rutland75 Rutland75 is offline
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Mein Auto: E39 323i 2000
Thank you Ron for the info:.
Brandon, They are not leaking I wanted to change them because I had removed the hose.
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