Troubleshooting Oil Pressure gauge/sender problem - Alfa Romeo Bulletin Board & Forums
 
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post #1 of 10 (permalink) Old 08-19-2019, 08:29 PM Thread Starter
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Question Troubleshooting Oil Pressure gauge/sender problem

My 67 GTV with the original 1600 cc engine is having a problem with no oil pressure reading on the Oil pressure gauge. I thought that it might be the sender which I replaced with a brand new one which is fitted on the block under the carburetors. I still don't get any reading on the gauge. I'm trying to determine whether the problem is with the gauge, the wiring, or something else that I'm not aware of. Hopefully it's not something worse like, there is no oil pressure. Any help with the process of closing in on the problem would be greatly appreciated.

Oddly, the official Alfa "Spare Parts Catalog" doesn't show the sender under the carburetors but shows pictures of it being located on the oil filter housing.
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post #2 of 10 (permalink) Old 08-19-2019, 11:21 PM
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You probably need a sender for veglia 1. series. You can test the sending unit as follows:

without connecting the control line, the instrument will show full scale; when the sending unit is connected, the pointer goes 2 mm below zero; if the control line is connected to ground then the pointer goes to zero.

There are a lot of bad and non working units on the market now.

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Last edited by Rosenmöller; 08-19-2019 at 11:33 PM.
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post #3 of 10 (permalink) Old 08-20-2019, 12:53 AM Thread Starter
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Bernard, thank you for your reply. My gauges are Veglia gauges. I ordered what was in the catalog (Centerline or Spruell; I can't remember where I ordered it from). I don't recall the catalog specifying the type of gauges. I will follow your instructions and will report the results. Thank you.
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post #4 of 10 (permalink) Old 08-20-2019, 12:58 AM
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centerline specifies:

https://www.centerlinealfa.com/catal...er-gauge-early

and you might as well look here:

https://www.alfabb.com/bb/forums/spi...html#post38665

Bernhard

Last edited by Rosenmöller; 08-20-2019 at 01:04 AM.
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post #5 of 10 (permalink) Old 08-20-2019, 07:04 AM
Richard Jemison
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Checking the gauge

If you ground the wire to the sender, the gauge should go to the Max reading.

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RJR Racing

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post #6 of 10 (permalink) Old 08-20-2019, 08:50 AM
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Quote:
If you ground the wire to the sender, the gauge should go to the Max reading.
That is for the later type gauges. The earlier ones work the opposite way.

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post #7 of 10 (permalink) Old 08-20-2019, 09:57 AM
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Quote:
Originally Posted by alfaparticle View Post

Quote:
Originally Posted by Alfar7 View Post
If you ground the wire to the sender, the gauge should go to the Max reading.
That is for the later type gauges. The earlier ones work the opposite way.
this is exactly what I wrote in post #2

Bernhard
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post #8 of 10 (permalink) Old 08-25-2019, 02:33 AM Thread Starter
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Red face Problem resolved

Thank you all for your responses. After checking several things I got under the dash and pulled out the gauge through the front of the dash but kept the wiring intact. Tested the oil pressure gauge and learned that wasn't the problem but did notice that there was a short black wire that came loose. I wasn't sure where it was dislodged from but quickly figured it out. Voila, problem solved. Oil pressure gauge is operating fine now.
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post #9 of 10 (permalink) Old 08-25-2019, 11:38 PM
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Alfa's are infamous for loose grounds, especially behind the dash (where you will never see it).

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post #10 of 10 (permalink) Old 09-08-2019, 11:48 AM
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I've got a 60 sprint (+ve ground)with a 105 series 1600. The temp gauge doesn't move unless I ground it at the sensor then full deflection. I'm sure the sensor is good. I wonder if it's a ground issue too, or do the giulietta gauge and later 105 gauges use different sending units. Anyone?

John
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