WBX to TD - 0.3 bar oil pressure sensor?

jolotter · Post by **jolotter** » Mon Apr 21, 2008 9:10 pm

I'm converting my 83.5 wbx vanagon to 1.6 turbo diesel

The wbx and also the stock vanagon NA diesel engine have only one oil pressure sensor, (as shown in their respective Bentley's.) 1.8 bar. My 1990 Jetta TD engine (engine code MF) has two oil pressure sensors. 1.8 bar and 0.3 bar.

I have connected the 1.8 bar switch in the side of the head to the vanagon oil pressure light but what should I do with the 0.3 bar sensor on the oil filter flange?

Luckypabst · Post by **Luckypabst** » Mon Apr 21, 2008 9:25 pm

Mine has a sendor in both locations. I've left the sender at the filter flange unhooked and otherwise acting as an effective plug.

Chris

libbybapa · Post by **libbybapa** » Tue Apr 22, 2008 2:48 pm

Are you planning on using the dynamic oil pressure warning system? If not, then ignore the high pressure sender.

Andrew

jolotter · Post by **jolotter** » Tue Apr 22, 2008 10:31 pm

libbybapa wrote:Are you planning on using the dynamic oil pressure warning system? If not, then ignore the high pressure sender.

Andrew

Doesn't the NA engine have just the high pressure sender?

Is there a control unit I should have pulled for the dynamic system?

Thanks

Johann

libbybapa · Post by **libbybapa** » Wed Apr 23, 2008 2:37 pm

Bear in mind, I haven't yet completed the task of adding a dynamic oil circuit to a non-equipped vanagon. That being said, the circuitry of the dynamic circuit is housed in the instrument cluster and includes the tachometer for the high pressure circuit. My plan is to use a later model vanagon instrument cluster and convert the gas tach to a diesel tach. The rest should be plug and play.

Certainly easier is just to run the single switch and idiot light. Then again, that's only easier if the engine does not blow up due to lack of oil pressure without warning.

Andrew

jolotter · Post by **jolotter** » Thu Apr 24, 2008 10:20 pm

I don't have the later cluster so I'll just use the 1.8 bar switch. Maybe I can use the other switch's spot to mount the sender for the oil pressure gauge I pulled from a cabriolet. Would it matter if the gauge sender went in the end of the head or the oil filter flange?

Johann

libbybapa · Post by **libbybapa** » Sat Apr 26, 2008 9:35 am

If you don't use the dynamic pressure system you only want to use the low pressure switch (normally closed). The 1.8 bar switch would be the high pressure one (normally open) and would cause the light to go on any time the oil pressure went above 26 psi.

Andrew

jolotter · Post by **jolotter** » Sun Apr 27, 2008 1:26 pm

I'm confused. Why does the bentley list the sole oil pressure switch for the vanagon diesel as well as the 1.9 wbx as 1.8 bar?

Johann

libbybapa · Post by **libbybapa** » Sun Apr 27, 2008 2:21 pm

I'm curious what page (maybe a scan) of the Bentley shows the diesel as a 1.8 bar switch. My Bentley says that both the diesel and 1.9 wbx have the 0.3 bar switch.

Andrew

libbybapa · Post by **libbybapa** » Sun Apr 27, 2008 2:52 pm

ETKA actually shows a .25 bar switch or a .15-.45 bar switch for both as well. There is no 1.8 bar oil pressure switch shown in ETKA for either the diesel or 1.9 WBX engines.

Andrew

jolotter · Post by **jolotter** » Sun Apr 27, 2008 8:57 pm

Sorry, no scanner.

My Bentley (c)1991, shows in the wiring diagrams,
wbx - p97.56, current track 29, OIL PRESSURE SW (1.8 bar)
diesel - p97.43, current track 29, OIL PRESSURE SW (1.8 bar)

Now you've got me looking,

In chapter 17 LUBRICATION SYSTEM it clearly states that in checking the pressure switch, the warning light should go out at 1.5 to 4.5 bar.

As you said.

Johann

libbybapa · Post by **libbybapa** » Sun Apr 27, 2008 11:43 pm

Ahh, I didn't think of looking at the wiring diagrams.

And, to answer your other question, the single light sensor should go in the head.

Andrew

jolotter · Post by **jolotter** » Mon Apr 28, 2008 9:16 am

Thanks

Johann