[BMWCSRegistry] Oil Pressure Whoopde doo.

[Tony Sims]

Dave,
Unless your engine has been rebuilt, that is likely the original pump.  
The early pumps were known to be marginal, in particular they would lose 
pressure if you braked hard...  Sounds like your pump needs to be 
replaced.  BMW revised the pump at some point, possibly during the life 
of the e12 5er?  Maybe later.  Anyway, there is a better pump 
available.  I think there may be a better pan baffle used in later 
engines too.  It's been a while since I thought about this, maybe 
someone with better recall will chime in.

Tony


Buettner, David L wrote:
> I have been working on a 73 cs for the last several months.  Last week, I had the front raised to a modest angle (tall jack stands with rear wheels on the ground) while I fiddled with the shifter.
>
> I started the car in that position for testing purposes and noticed the oil pressure light remained on.
>
> I dropped the car and restarted the engine only to find the oil light remaining on.  I went through the usual diagnostics, concluding that I did indeed have an oil pressure problem.
>
> Last night I removed the pan and oil pump to see what I could find.  It appears that I have a sloppy oil pump that lost its prime.  It is not pretty inside, but seems as if it ought to at least pump a little oil.  Sucking air through the long pick up on these things is apparently another matter.
>
> I used my portable drill to spin the pump with the sump submerged.  Submerged in solvent, I got it to prime once, but not easily.  In room temperature oil, it would not prime.  I was amazed, but I could spin the pump at will with no discharge.  Really amazed.
>
> When I prime the pump from the top and then spin it, it works.  But with this experience, I don't want to trust that pump to retain its prime under driving conditions.
>
> Two questions:
>
> Anyone have a pump or good source?
>
> And,
>
> Anyone have experience like this?  Like I said, I am a bit amazed.
>
> Any advice or feedback will be appreciated.
>
> Dave
>
>
>
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