[Roadsters] Dropping Oil Pressure at idle

[Gary and Cindy Ault]

Hoon,

This is a typical response of many early electrical oil pressure gauges.  My 
'66 1600/'69 U20 oil pressure dros to near zero at idle, and has for as long 
as I have had the motor in the car.  As soon as I "blip" the throttle, the 
pressure comes back.

Gary
----- Original Message ----- 
From: "Hoon Kim" <hoonhkim at gmail.com>
To: "Roadster mailist" <datsun-roadsters at autox.team.net>
Sent: Tuesday, July 27, 2010 3:08 PM
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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