[T3] 73 T-3 oil temp?

Wed Sep 8 20:19:39 PDT 2021

I'm not sure this engine has loose clearances, and there is no way to check
without tearing it down which I'm not about to do.  It's just basically a
test .

On Wed, Sep 8, 2021 at 8:13 PM Keith Park <topnotch at nycap.rr.com> wrote:

> In the heat, with loose clearances 40wt is fine, but... why not go to
> 25W50?
> I used it the last 50K or so miles of my last engine and that lasted 165K,
> could still start it
> Down into the 40's....
>
> Keith
>
>
> Topnotch Restorations
> topnotch at nycap.rr.com
> http://www.topnotchresto.com
> 71 Squareback  “Hothe”
> 65 Notchback  “El Baja Rojo”
> 93 RX7  “Redstur”
> 13 Subaru Outback "Blendin"
>
> -----Original Message-----
> From: type3-vwtype3.org <type3-vwtype3.org-bounces at lists.vwtype3.org> On
> Behalf Of William Jahn
> Sent: Wednesday, September 8, 2021 10:53 PM
> To: type3 at vwtype3.org
> Subject: Re: [T3] 73 T-3 oil temp?
>
> I am always told SAE 40 is too thick. Would it be wise to try SAE 30? Just
> to see what the temps are. Autozone has STP SAE30 detergent oil , no idea
> what the zinc content is . I still want to see what the cooler bypass
> relief
> valve looks like. If the spring is weak it may not allow the oil to go
> through the cooler. I do have a NOS spring and piston, also want to know if
> the relief valve is free and not stuck. It's been there since 97 and I used
> the one from the 73 case so that spring has to be pretty old and the
> 73 did get real hot once over 250.   I understand how thick oil may take
> too long to open the path to the cooler. I ran Castrol for a few years. It
> has no zinc yet it didn't hurt anything. This engine does not have more
> than
> 40K miles on it . If I go to SAE 30 and it runs cooler and I hear no noises
> it might be ok , if I hear noise I can go back to SAE 40.  The Valvoline
> SAE
> 30 costs a lot just to see if 30 makes any difference.
>
> On Wed, Sep 8, 2021 at 10:36 AM William Jahn <willjahn975 at gmail.com>
> wrote:
>
> > I looked at Gene Bergs site last night and this is the main part . " I
> > have run hundreds of accuracy tests on practically every inexpensive
> > aftermarket gauge under $125 offered. Practically all read low in the
> > 212 to 260 degree range by 40 to 50 degrees on oil temperature and
> > head temperature gauges in the 250 to 550 degree reading range, again
> > being low by as much as 250 or more degrees. I tested about twenty
> > each of most brands such as VDO, Smith, Stewart Warner, Hawk, etc.,
> > and found none without these problems.
> >
> > Oil temperature gauge readings would be 212 to 220 degrees on the
> > gauge when the true test temperature was 240 to 260 degrees. Head
> > temperature gauges read 385 degrees with a true test temperature of 550
> plus degrees.
> > When head test temperatures were upped to 700 degrees, the reading of
> > the gauge went up to 390 to 395 degrees. The price range of such
> > gauges was from $60 to $125. I swapped gauges with senders and got
> different readings.
> > I found nothing in that price range I would wish on my worst enemy.
> > Not one I tested could ever be properly calibrated or relied on in any
> > way for any valid information or even as a comparison from day to day
> > on the air cooled VW."
> >
> >  This is the video I saw talking about the VDO temp gauge sensor in
> > the oil cooler bypass spot.
> > https://www.youtube.com/watch?v=OBdOMmf1Pho&t=15s.
> >
> >  He mentions Gene Berg , talks about the thermometer down the
> > dipstick. I really question his  knowledge. He never actually shows
> > any tests or offers any proof.  If you want to watch it do let me know if
> you see and hear.
> > what I do.
> >
> >  I can test the sensor in boiling water to see what the ohm reading
> > is. I Realize boiling point changes at altitude so I need to find a
> > chart . The other thing I need to do  to really know is heat the
> > sensor to 212F and to actually know what the gauge reads. In order to
> > do this I would need to use a hot plate to boil the water , and have
> > the sensor connected to the gauge to know what the gauge actually
> > reads. The only info I have is 700 ohm cold and 22 ohm warm. I guess I
> > could get the sensor to 212F, check the ohm readout then use a
> > variable resistor set to that value and see what the temp gauge reads.
> That may be the easiest solution.
> >
> >  All the decades VW never had more than an oil light and people lived
> > with this and it seemed to work. On the other hand I feel it's good to
> > have a temp gauge and pressure and voltmeter.
> >
> >
> >
> > On Wed, Sep 8, 2021 at 7:19 AM Jim Adney <jadney at vwtype3.org> wrote:
> >
> >> On 7 Sep 2021 at 11:39, William Jahn wrote:
> >>
> >> >  I read that Gene Berg said most of the VDO and other brands of oil
> >> > temp gauge senders were not accurate in a certain range , and I
> >> > can't recall
> >> off
> >> > hand what the range was. I'm also not sure if he was referring to
> >> > both
> >> the
> >> > gauge and sender combined.
> >>
> >> My recollection is that Berg simply said that all the temp sensors he
> >> had tested were inaccurate. I'm willing to assume he meant the
> >> combination of sensor and readout, since nothing else makes sense. I
> >> don't recall his mentioning any particular range, but the only range
> >> you're interested in is the one that just happens to be around the
> >> boiling point of water.
> >>
> >> Gene said this as an introduction of his Beetle dipstick sensor
> >> indicator, which is just an on/off switch that you wire in parallel
> >> to the oil pressure switch, so it also turns the oil pressure light
> >> ON at 212 F. This is quite reasonable since that's a good checkable
> >> point for oil temp.
> >>
> >> It was this note from Gene that made me realize that this was a good
> >> way for anyone to check the accuracy of their gauge. If you happen to
> >> live at high altitude, where water boils at lower temps, you may want
> >> to drive downhill a bit to do this test, or find a chart for boiling
> >> point of water vs.
> >> altitude.
> >>
> >> --
> >> *******************************
> >> Jim Adney, jadney at vwtype3.org
> >> Madison, Wisconsin, USA
> >> *******************************
> >>
> >> _______________________________________________
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> >
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