[Roadsters] Dropping Oil Pressure at idle

[Gary and Cindy Ault]

Hoon,

Stalling would only be a result of alternator problems if your battery
is 
discharged.  Lights would be dim at idle if the alternator cuts out, but
the 
engine should not be affected.  And, the alternator swap did not cause
any 
problems with oil pressure unless you poured some sand into the motor
while you 
were at it.  I don't think the stalling is at all related to the
drop in oil 
pressure.  And, if the oil pressure comes right up when to raise
the rpm a bit, 
I wouldn't worry about low oil pressure at idle, as I said in
my original note.

Gary


________________________________
From: Hoon Kim
<hoonhkim at gmail.com>
To: Gary and Cindy Ault <aultgc at att.net>
Cc: Roadster
mailist <datsun-roadsters at autox.team.net>
Sent: Wed, July 28, 2010 2:31:50 PM
Subject: Re: [Roadsters] Dropping Oil Pressure at idle

I guess the real
problem is that my engine starts to stall now with the pressure 
dropping. I'm
not as concerned about it dropping but what the engine is doing 
when it
drops. This was not a problem before the alternator swap. 


I think it may
have to do with the GM swap and the alternator not kicking in at 
idle. I'll
have to test it out. 



On Wed, Jul 28, 2010 at 12:01 AM, Gary and Cindy Ault
<aultgc at att.net> wrote:

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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