[Vwdiesel] Oil Pressure idiot light & buzzer

[James Hansen]

Your friend's info is correct, but there are a few assumptions being 
made in that statement.
10psi for every 1k rpm is great for a tight motor, assuming 2 to 2.5 
thou bearing clearances.
When the motor is older, and worn, with intermediate bearings taking 
most of the oil, you need a hell of a lot more than what the Volvo 
engineer suggests, unless you like walking the fine line between blow or 
go, usually the rod bearing furthest from the pump goes first.
-james



William Longyard wrote:
> My buzzer and idiot light come on at about 25psi, which is way too high. 
> I'm hoping the sender is bad, but I haven't had time to swap it out.  It is 
> VERY annoying.  A Volvo engineer friend told me that you only need 10psi per 
> 1,000 revs (at the most).  So if you're idling at 800 rpm you only needs 
> 8lbs of oil pressure.  My 25 lbs is plenty.
> 
> Bill Longyard
> 
> 
> ----- Original Message ----- 
> From: "Pam & Doug Boes" <db53248 at alltel.net>
> To: <vwdiesel at vwfans.com>
> Sent: Thursday, June 07, 2007 5:59 PM
> Subject: [Vwdiesel] Oil Pressure idiot light & buzzer
> 
> 
>> My daughter's Golf diesel started showing the oil pressure idiot light and
>> warning buzzer yesterday. When the engine is cold, the light doesn't come
>> on. After driving for awhile the light starts flickering and the buzzer 
>> goes
>> off. I had her top off the oil and drive it home. It doesn't smell hot 
>> like
>> there is no oil circulation and the water temp gage shows normal.
>>
>>
>>
>> Do the sender units on the N/A engines degrade before failing completely?
>> I've asked a couple of gearheads and they all say to get a gage and 
>> connect
>> it to the sender ports to see what the pressure actually is. How likely 
>> are
>> worn bearings, etc that would be too sloppy to maintain oil pressure after
>> the engine is warmed up? There doesn't seem to be any corresponding 
>> drop-off
>> in performance when the light comes on. I'm planning to get a gage & check
>> the actual pressures at each port and change both sender units to see if
>> that cures the problem.
>>
>>
>>
>> Any other suggestions?
>>
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> 
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