[Roadsters] Dropping Oil Pressure at idle

[Eddie]

The only thing that I think could cause the alternator to affect the oil 
pressure at idle would be if the NEW alternator has more "drag" on the 
engine... 


Pete Peters wrote:
> Can't believe that replacing the alternator affected the oil pressure. 
>
> My experience (my '66 1600, someone else's '66 1600 and '69 2000) is that
> the oil pressure gauge reads near zero when warm, and comes up to normal
> once past 2k rpm.
>
> I always replace the oil -AND- filter at the same time, never just one or
> the other.
>
> Pete
>
> -----Original Message-----
> From: datsun-roadsters-bounces at autox.team.net
> [mailto:datsun-roadsters-bounces at autox.team.net] On Behalf Of Hoon Kim
> Sent: Tuesday, July 27, 2010 1:09 PM
> To: Roadster mailist
> Subject: [Roadsters] Dropping Oil Pressure at idle
>
> Just when things are starting to come together, something else shows up.
> Such is the nature of our cars.
>
> After successfully (I hope), swapping out for a new larger alternator, I've
> noticed that my oil pressure is now dropping when I'm at idle. This is
> happening after the engine is warm. When I rev the engine or when I'm
> travelling, the pressure returns to normal. I'm pretty sure it is not my oil
> gauge since I let it drop until the engine stalled on me. I didn't notice
> any knocking, just as the oil pressure drops, the engine gets rougher. I did
> also recently replace the oil filter, but haven't changed the oil. Any ideas
> on what it could be?
>
> Is my engine wearing down (I hope not)?
> Do I need a new oil pressure sending unit?
> Do I need a new oil pump?
> Do I need to add more oil or a heavier weight (don't think so)?
>
> Thanks all.
>
> Hoon
> Early '67 1600
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