Thanks for replying Dennis.  I was planning on monitoring the temp.  Do you
know what is normal?  200 degF +-?

What are "90 metric fittings"?

I am going to replace the stock engine oil cooler.  I am now just looking at
fitment issues, pipe routing, cooler protection,..

Thanks again,
Helen & Joe Fahy
'87 Westy

----- Original Message -----
From: "Dennis Haynes" <dhaynes@optonline.net>
To: <72510.1173@COMPUSERVE.COM>; <vanagon@GERRY.VANAGON.COM>
Sent: Thursday, August 15, 2002 8:43 PM
Subject: RE: Transmission cooler

>
> The transmission pump is definitely a positive displacement pump
> designed to produce hydraulic pressure required to operate the clutches
> and valves. Most of the heat in an automatic transmission is developed
> in the torque converter. The Vanagon converter is heavily finned and
> does an excellent job keeping itself cool. In fact, the air cooled
> busses use this set up with no additional cooling at all. The first step
> would be to measure trans oil temp and see if you even have a problem.
> If you decide you need an external cooler, remove the stock cooler from
> the front of the transmission, block off the coolant hoses and get 90
> metric fittings to attach hoses to the transmission. An additional
> advantage of this is to keep the transmission heat from getting into the
> engine cooling system.
>
> Dennis
>
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf
> Of Helen Fahy
> Sent: Wednesday, August 14, 2002 9:42 AM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Transmission cooler
>
> What kind of pump does the automatic transmission use to circulate
> transmission fluid through the transmission oil/water cooler?
>
> The engine oil pump is a positive displacement pump and up to the oil
> pressure relief setting, the pump increases oil pressure to overcome
> pressure drops while maintaining oil flow rate (for a constant oil
> temperature).  So when I add an oil cooler, the pump increases its
> outlet
> pressure to make up for the additional pressure drop incurred by
> additional
> fittings, piping and the oil cooler.
>
> I am considering adding a tranny cooler in addition to the oil cooler
> that I
> am installing.  I am concerned that the transmission oil pump, if not a
> positive displacement pump, may ride up the pump curve and starve the
> transmission of oil.  Can anyone shed some light on the issues of
> installing
> a transmission oil cooler?  Perhaps I would need to install an accessory
> pump in series to overcome the additional pressure drop of the tranny
> cooler
> and its fittings.
>
> Has anyone ever monitored the temperature of the automatic transmission
> under varying load and ambient temperature conditions?
>
> Thanks,
> Helen & Joe Fahy
> '87 Westy
>
>
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